Part 42 Manual of Standards

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Part 42 Manual of Standards (as amended)

made under regulation 42.020 of the Civil Aviation Safety Regulations 1998.

This compilation was prepared on 21 December 2022 taking into account amendments up to Part 42 Manual of Standards Amendment Instrument 2022 (No. 1). It is a compilation of Part 42 Manual of Standards, as amended and in force on 21 December 2022.

Prepared by the Advisory & Drafting Branch, Legal, International & Regulatory Affairs Division, Civil Aviation Safety Authority, Canberra.

Compilation No. 4.

Contents

Page

Preliminary....

Chapter 1.....Requirements for CAMO............................................

Chapter 2.....Requirements for a maintenance program for large aircraft and aircraft operated under an AOC

Chapter 3.....Requirements for approved reliability program............................

Chapter 4.....This Chapter is reserved for future use..................................

Chapter 5.....This Chapter is reserved for future use..................................

Chapter 6.....Carrying out maintenance on Australian aircraft outside Australian territory.......

Chapter 7.....Carrying out maintenance on an aeronautical product for an Australian aircraft outside Australian territory

Chapter 8.....This Chapter is reserved for future use..................................

Chapter 9.....Aviation industry standards..........................................

Chapter 10....Aeroplanes and helicopters of particular type and model that are specified as large aircraft.....................................................

Chapter 11....Aeroplanes and helicopters of particular type and model that are specified as small aircraft....................................................

Chapter 12....Documents issued under the law of a foreign country that are authorised release certificates................................................

Chapter 13....This Chapter is reserved for future use..................................

Chapter 14....This Chapter is reserved for future use..................................

Chapter 15....Maintenance for items 4 and 5 of Table 42.300 of CASR 1998................

Note to Part 42 Manual of Standards................................................

Preliminary

1A Name of instrument

This instrument is the Part 42 Manual of Standards.

Chapter 1

Requirements for CAMO

1.1 Introduction

1.1.1 Paragraphs 42.020 (2) (n) and 42.020 (4) (b) of the Civil Aviation Safety Regulations 1998 (CASR 1998) provide that the Part 42 MOS may specify requirements for a continuing airworthiness management organisation (CAMO).

1.1.2 This Chapter sets out certain requirements to be met by a CAMO for the issue and continuation of an approval to provide continuing airworthiness management services for aircraft.

1.1.3 This Chapter also sets out requirements in relation to writing of procedures, by a CAMO, for carrying out maintenance.

1.1.4 In this Chapter, the mention of a “Commission Regulation” in the heading of a section is a cross-reference to a similar provision in Part M of the European Commission Regulation on the continuing airworthiness of aircraft and aeronautical products, parts and appliances, and on the approval of organisations and personnel involved in these tasks. It is for information only.

1.2 Continuing airworthiness management exposition [Commission Regulation M.A.704]

1.2.1 The CAMO must have an exposition that contains at least the following information:

(a) a statement signed by the accountable manager to confirm that the CAMO will provide continuing airworthiness management services in accordance with Part 42 of CASR 1998, this MOS and its exposition at all times;

(b) detailed scope of the continuing airworthiness management services the CAMO is approved to provide;

(i) accountable manager;

(ii) continuing airworthiness manager, including any substitute continuing airworthiness manager;

(iii) each responsible manager;

(iv) quality manager;

(d) a chart showing the CAMO’s structure and associated chains of responsibility of individuals within the CAMO;

(e) a description of the CAMO’s facilities and equipment at each location as required under section 1.3;

(f) a list of airworthiness review employees as required under section 1.9;

(g) a list of maintenance program approval employees as required under section 1.10;

(h) procedures for making changes to the exposition;

(i) procedures that specify how the CAMO ensures compliance with Part 42 of CASR 1998 and any requirement in this MOS.

1.3 Facility and equipment [Commission Regulation M.A.706]

1.3.1 The CAMO must have appropriately equipped facilities for providing the continuing airworthiness management services it is approved to provide, including:

(a) office accommodation for all employees providing continuing airworthiness management services; and

(b) facilities for the completion and retention of records and documents in accordance with the requirements of Part 42 of CASR 1998 and this MOS.

1.3.2 The office accommodation must be of a standard that will ensure employees can perform their duties without undue distraction or discomfort.

1.4 Accountable manager [Commission Regulation M.A.706]

1.4.1 The CAMO must appoint an individual as the accountable manager who is ultimately responsible for ensuring:

(a) that the CAMO complies with CASR 1998, this MOS, its approval and its exposition; and

(b) that the CAMO has adequate resources to provide continuing airworthiness management services in accordance with its exposition.

1.4.2 If the CAMO is an air transport air operator’s certificate (AOC) holder, the accountable manager for the CAMO must be an individual who has the corporate authority for managing and financing the operation under the AOC.

1.4.3 If the CAMO is not an air transport AOC holder, the accountable manager must be an individual who has the corporate authority for managing and financing the CAMO.

1.5 Responsible manager [Commission Regulation M.A.706]

1.5.1 The CAMO must appoint at least 1 individual as the responsible manager, responsible for ensuring that the CAMO complies with CASR 1998, this MOS and the CAMO’s exposition.

Note The CAMO may appoint more than 1 individual as the responsible manager. However, each appointee is responsible for ensuring that the CAMO complies with CASR 1998, this MOS and the CAMO’s exposition.

1.5.2 Each responsible manager must be responsible for ensuring that the CAMO complies with CASR 1998, this MOS and the CAMO’s exposition in relation to matters for which he or she is responsible.

1.5.3 Subject to subsection 1.5.4, each responsible manager must be responsible to the accountable manager unless he or she is also the accountable manager.

1.5.4 If the CAMO is an air transport AOC holder, each responsible manager whose responsibility includes ensuring the CAMO’s compliance with CASR 1998, this MOS and the CAMO’s exposition in relation to providing continuing airworthiness management services for an aircraft authorised to operate under the AOC, must be responsible to the continuing airworthiness manager unless he or she is the continuing airworthiness manager.

1.5.5 A responsible manager must have:

(a) at least 5 years experience in matters for which he or she is responsible; or

(b) at least 2 years experience in matters for which he or she is responsible provided he or she has at least an additional 3 years experience in civil aircraft maintenance.

1.5.6 A responsible manager must have a comprehensive knowledge of:

(a) the regulations and standards; and

(b) the CAMO’s exposition;

relating to matters for which he or she is responsible.

1.5.7 A responsible manager, whose responsibility includes ensuring the CAMO’s compliance with CASR 1998, this MOS and the CAMO’s exposition in relation to providing continuing airworthiness management services for an aircraft, must have knowledge of the following:

(a) the aircraft’s certification basis;

(b) the aircraft’s structure and systems, including the propulsion system, to a level that is at least equivalent to Level 1 as set out in Appendix III of the Part 66 MOS;

(d) if applicable, the relevant parts of the AOC holder’s operations manual that have continuing airworthiness implications for the aircraft.

1.5.8 The CAMO must:

(a) have copies of all documents that demonstrate that each responsible manager has the appropriate qualifications, experience and knowledge required under this section; and

(b) keep the copies for at least 2 years after the responsible manager ceases to be a responsible manager.

1.6 Continuing airworthiness manager [Commission Regulation M.A.706]

1.6.1 If a CAMO is an air transport AOC holder, the CAMO must appoint an individual as the continuing airworthiness manager who is responsible for ensuring that the CAMO complies with CASR 1998, this MOS and the CAMO’s exposition in relation to providing continuing airworthiness management services for the aircraft authorised to operate under the AOC.

1.6.2 The continuing airworthiness manager must report directly to the accountable manager of the CAMO unless he or she is also the accountable manager.

1.6.3 Subject to subsection 1.6.6, the continuing airworthiness manager must:

(a) hold, or have held, an aircraft engineer licence in category B1, B2 or C; or

(b) hold, or have held, a licence that is equivalent to a licence in category B1, B2 or C; or

(d) have a qualification in aviation maintenance management at least at diploma level; or

(e) have an engineering qualification at least at diploma level in any of the following disciplines:

(i) aeronautical;

(ii) avionics;

(iii) mechanical;

(iv) electrical;

(v) electronics.

1.6.4 The continuing airworthiness manager must have at least 3 years experience in continuing airworthiness management of aircraft.

1.6.5 The continuing airworthiness manager must have the following:

(a) a comprehensive knowledge of the regulations and standards applicable to airworthiness of aircraft authorised to operate under the AOC;

(b) knowledge of the CAMO’s exposition;

(c) if applicable, knowledge of the relevant parts of the AOC holder’s operations manual that have continuing airworthiness implications for aircraft authorised to operate under the AOC;

(d) knowledge of the CAMO’s quality system.

1.6.6 Despite the requirements of subsection 1.6.3, an individual who is the maintenance controller for an operator is eligible to be appointed as the continuing airworthiness manager of the CAMO at the time the operator is approved as a CAMO.

Note To be appointed as the continuing airworthiness manager of the CAMO, the person must comply with the other applicable provisions of section 1.6.

1.6.7 The CAMO may nominate an individual to be a substitute continuing airworthiness manager who may perform the role of the continuing airworthiness manager in his or her temporary absence.

1.6.8 The substitute continuing airworthiness manager must meet the requirements of this section in relation to qualifications, experience and knowledge of a continuing airworthiness manager.

1.6.9 The continuing airworthiness manager and the substitute continuing airworthiness manager must not be a responsible manager for a maintenance organisation that provides maintenance services for the aircraft that are authorised to operate under the air transport AOC.

1.6.10 The CAMO must:

(a) have copies of all documents that demonstrate that the continuing airworthiness manager and the substitute continuing airworthiness manager each have the appropriate qualifications, experience and knowledge required under this section; and

(b) keep the copies for at least 2 years after each person ceases to be the continuing airworthiness manager or the substitute continuing airworthiness manager, as the case may be.

1.7 Quality manager [Commission Regulation M.A.712]

1.7.1 A CAMO that is required to have a quality system under section 1.13 must nominate a quality manager with responsibility for implementing and managing the quality system.

1.7.2 The quality manager must report directly to the accountable manager in relation to his or her responsibilities under this MOS.

1.7.3 The quality manager must not be the continuing airworthiness manager or a responsible manager of the CAMO.

1.7.4 The quality manager must have:

(a) comprehensive knowledge of the CAMO’s exposition; and

(b) knowledge of the regulations and standards applicable to continuing airworthiness of aircraft; and

(c) successfully completed a course in quality management which is at least equivalent to the type of course required for a person to gain certification as a lead auditor; and

(d) at least 2 years experience in quality management.

1.7.5 The CAMO must:

(a) have copies of all documents that demonstrate that the quality manager has the appropriate qualifications, experience and knowledge required under this section; and

(b) keep the copies for at least 2 years after the quality manager ceases to be the quality manager.

1.8 Continuing airworthiness management employees [Commission Regulation M.A.706]

1.8.1 The CAMO must have a sufficient number of appropriately qualified employees to provide the continuing airworthiness management services it is approved to provide including:

(a) airworthiness review employees required under section 1.9; and

(b) maintenance program approval employees required under section 1.10.

1.8.2 The CAMO must:

(a) have written records of the qualifications of each employee involved in providing continuing airworthiness management services; and

(b) keep the copies for at least 2 years after the employee ceases to be involved in providing continuing airworthiness management services.

1.9 Airworthiness review employee [Commission Regulation M.A.707]

1.9.1 A CAMO that provides continuing airworthiness management services for large aircraft or aircraft operated under an AOC must have airworthiness review employees to carry out airworthiness reviews and issue airworthiness review certificates in accordance with Subpart 42.I of CASR 1998.

1.9.2 The airworthiness review employee must be authorised by the CAMO, in writing, to carry out an airworthiness review and to issue an airworthiness review certificate on behalf of the CAMO.

1.9.3 The authorisation must include the following information:

(a) name of the employee;

(b) an authorisation reference number;

(d) the type and model of aircraft for which the authorisation is given;

(e) the scope and limitations of the authorisation;

(f) the duration (if applicable) of the authorisation.

1.9.4 The airworthiness review employee must:

(a) have at least 5 years experience in continuing airworthiness management activities; or

(b) have at least 2 years experience in continuing airworthiness management activities, provided he or she holds or has held:

(i) a maintenance certification licence in category B1, B2 or C; or

(ii) a licence that is equivalent to a licence in category B1, B2 or C.

1.9.5 An airworthiness review employee must have a comprehensive knowledge of regulations and standards applicable to the airworthiness of the aircraft for which the employee is authorised.

1.9.6 An airworthiness review employee must have knowledge of the following for the aircraft for which the employee is authorised:

(a) the aircraft’s certification basis;

(b) the aircraft’s structure and systems, including the propulsion system, to a level that is at least equivalent to Level 1 as set out in Appendix III of the Part 66 MOS.

1.9.7 The CAMO must keep a list of airworthiness review employees which contains the information mentioned in subsection 1.9.3.

1.9.8 The CAMO must:

(a) have copies of all documents that demonstrate that each airworthiness review employee has the appropriate qualifications, experience and knowledge required under this section; and

(b) keep the copies for at least 2 years after the airworthiness review employee ceases to be an airworthiness review employee.

1.9.9 The CAMO must keep a copy of the authorisation for 2 years after the authorisation ceases to be in force.

1.10 Maintenance program approval employee

1.10.1 The CAMO that has privilege under Subpart 42.G of CASR 1998 to approve aircraft maintenance programs, or variations to an approved maintenance program, must have maintenance program approval employees to approve a maintenance program or variations to an approved maintenance program in accordance with Subpart 42.J of CASR 1998.

1.10.2 The maintenance program approval employees must be authorised by the CAMO, in writing, to approve a maintenance program and variations to a maintenance program on behalf of the CAMO.

1.10.3 The authorisation must include the following information:

(a) name of the employee;

(b) an authorisation reference number;

(d) the type and model of aircraft for which the authorisation is given;

(e) the scope and the limitations of the authorisation;

(f) the duration (if applicable) of the authorisation.

1.10.4 The maintenance program approval employee must:

(a) hold, or have held, an aircraft engineer licence in category B1, B2 or C; or

(b) hold, or have held, a licence that is equivalent to a licence in category B1, B2 or C; or

(d) have a qualification in aviation maintenance management at least at diploma level; or

(e) have an engineering qualification at least at diploma level in any of the following disciplines:

(i) aeronautical;

(ii) avionics;

(iii) mechanical;

(iv) electrical;

(v) electronics.

1.10.5 The maintenance program approval employee must have at least 3 years experience in the development and management of a maintenance program for aircraft that are the same, or of a similar type, as the aircraft for which the employee is authorised.

1.10.6 The maintenance program approval employee must have a comprehensive knowledge of the following:

(a) the regulations and standards applicable to the maintenance program for the aircraft for which the employee is authorised;

(b) maintenance requirements related to operational approvals, if applicable;

(d) regular maintenance requirements included in the instruction for continuing airworthiness for the aircraft for which the employee is authorised.

1.10.7 The maintenance program approval employee must have knowledge of the specifications and standards that have been used by the type certificate holder to develop regular maintenance requirements for the aircraft for which the employee is authorised.

1.10.8 The maintenance program approval employee must have knowledge of the following for the aircraft for which the employee is authorised:

(a) the aircraft’s certification basis;

(b) the aircraft’s structure and systems, including the propulsion system, to a level that is at least equivalent to Level 1 as set out in Appendix III of the Part 66 MOS.

1.10.9 The CAMO must keep a list of maintenance program employees which contains the information mentioned in subsection 1.10.3.

1.10.10 The CAMO must:

(a) have copies of all documents that demonstrate that each maintenance program employee has the appropriate qualifications, experience and knowledge required under this section; and

(b) keep the copies for at least 2 years after the maintenance program employee ceases to be a maintenance program employee.

1.10.11 The CAMO must keep a copy of the authorisation for 2 years after the authorisation ceases to be in force.

1.11 Instructions for continuing airworthiness [Commission Regulation M.A.709]

1.11.1 The CAMO must have current instructions for continuing airworthiness for the aircraft for which the CAMO is approved to provide continuing airworthiness management services.

1.11.2 The CAMO must ensure that an employee providing continuing airworthiness management services for an aircraft has access to instructions for continuing airworthiness that relate to the employee’s duties.

1.12 Maintenance data

1.12.1 The CAMO may approve new procedures, or changes to existing procedures, for carrying out particular maintenance on an aircraft or an aeronautical product, if:

(a) the maintenance is included, or is to be included, in the maintenance program for an aircraft for which the CAMO provides continuing airworthiness management services; and

(b) there is no existing maintenance data that includes the procedure for carrying out the maintenance, or the procedure in the existing maintenance data is inadequate or inappropriate for the maintenance; and

(c) the CAMO’s approval permits it to approve the maintenance program, or a variation to the maintenance program, for the aircraft or product; and

(d) the new procedures, or changes to existing procedure do not make any damage or wear limits, or any inspection or test parameters, less restrictive than those included in the existing maintenance data for the aircraft or the aeronautical product, unless the relevant existing maintenance data was originally created by the CAMO.

1.12.2 The maintenance procedure must be approved as part of the maintenance program, or changes to the maintenance program, for the aircraft in accordance with Subpart 42.J of CASR 1998.

1.12.3 The CAMO must ensure that the maintenance program employee, who approves the maintenance program, has assessed the procedure to ensure that it provides for safe maintenance practice, airworthy aircraft and serviceable aeronautical product.

1.12.4 The CAMO must ensure the new or changed procedure is:

(a) clearly identified as maintenance data created, or changed, by the CAMO; and

(b) traceable to the approval under which the data is created or changed.

1.13 Quality system [Commission Regulation M.A.712]

1.13.1 A CAMO that provides continuing airworthiness management services for large aircraft and aircraft operated under an AOC must have a written quality system that requires:

(a) carrying out of independent audits to monitor:

(i) the CAMO’s compliance with Part 42 of CASR 1998, this MOS and its exposition; and

(ii) the adequacy of the CAMO’s procedures in providing continuing airworthiness management services in accordance with Part 42 of CASR 1998 and this MOS; and

(iii) the standard of maintenance being carried out on the aircraft meets the requirements of Part 42 and Part 145 of CASR 1998; and

(b) the recording of all audit findings; and

(d) the implementation of corrective and preventative actions for any deficiencies identified in the audit findings; and

(e) the provision of feedback to the quality manager about the corrective and preventative action implemented.

1.13.2 The audit must be carried out in accordance with a documented plan which ensures all items to be audited under subsection 1.13.1 are audited once every 12 months.

1.13.3 The audits must be carried out by individuals who are independent of the items being audited and who:

(a) have comprehensive knowledge of the CAMO’s exposition; and

(aa) have knowledge of the regulations and standards applicable to continuing airworthiness of aircraft; and

(b) have successfully completed a course in quality audit which is at least equivalent to the type of course required for a person to gain certification as a quality auditor.

1.13.4 A CAMO must ensure any corrective and preventative action, in relation to deficiencies identified in the audit findings, is implemented in a timely manner.

1.13.5 A CAMO must keep records containing the following information in relation to the audit:

(a) the scope and contents of the audit;

(b) when the audit was carried out;

(d) the findings of the audit;

(e) details of preventive and corrective actions implemented for any deficiencies identified in the findings of the audit.

1.13.6 The records mentioned in subsection 1.13.5 must be kept for at least 2 years from the date the audit was conducted.

1.14 Internal review [Commission Regulation M.A.712]

1.14.1 A CAMO that provides continuing airworthiness management services for aircraft, other than large aircraft and aircraft operated under an AOC, must:

(a) have a quality system in accordance with section 1.13; or

(b) carry out internal reviews in accordance with this section to ensure the CAMO’s compliance with its exposition, Part 42 of CASR 1998 and this MOS.

1.14.2 The reviews must be carried out in accordance with a documented plan which ensures all items to be reviewed under this section are reviewed once every 12 months.

1.14.3 Each review must be carried out by individuals who:

(a) have comprehensive knowledge of the CAMO’s exposition, Part 42 of CASR 1998 and this MOS; and

(b) have:

(i) successfully completed a course in quality audit which is at least equivalent to the type of course required for a person to gain certification as a quality auditor; or

(ii) 3 years’ experience in performing internal review of a CAMO.

1.14.4 The findings of the review must be recorded and reported to the accountable manager and the responsible manager.

1.14.5 A CAMO must ensure any corrective and preventative actions, in relation to deficiencies identified in the review, are implemented in a timely manner.

1.14.6 A CAMO must keep records containing the following information in relation to the review:

(a) the scope and contents of the review;

(b) when the review was conducted;

(d) the findings of the review;

(e) details of preventive and corrective actions implemented for any deficiencies identified in the findings of the review.

1.14.7 The records mentioned in subsection 1.14.6 must be kept for 2 years from the date the review was carried out.

1.15 Records [Commission Regulation M.A.714]

1.15.1 A CAMO must ensure records kept under this MOS are kept:

(a) in a system that allows the record to be retrieved; and

(b) in a manner that ensures records are protected from damage, unintended alteration and loss.

Chapter 2

Requirements for a maintenance program for large aircraft and aircraft operated under an AOC

2.1 Introduction

2.1.1 This Chapter specifies for paragraph 42.020 (2) (j) of CASR 1998, the requirements for a maintenance program for the following:

(a) a large aircraft;

(b) an aircraft operated under an AOC.

Note Under regulation 42.140 of CASR 1998, the person responsible for continuing airworthiness for each aircraft mentioned in paragraph 2.1.1 (a) and (b) must ensure that there is an approved maintenance program for the aircraft.

2.2 General requirements

2.2.1 The maintenance program must:

(a) be in writing; and

(b) define the meaning of any unique terms or acronyms used in the program; and

(i) the program; and

(ii) any subsequent variations to the program.

2.3 Identification and applicability of the program

2.3.1 The maintenance program must contain the following information:

(a) the type, model, serial number and registration mark of the aircraft covered by the program;

(b) the type and model of each engine fitted to the aircraft;

(d) the type and model of each auxiliary power unit fitted to the aircraft (if applicable);

(e) the name and address of the registered operator of the aircraft;

(f) the name and approval certificate reference number of the CAMO responsible for the program.

2.4 Instructions for continuing airworthiness

2.4.1 The maintenance program must identify, by their latest revision date, the instructions for continuing airworthiness (ICA) on which the program is based, including if applicable:

(a) the aircraft type certificate holder’s maintenance review board (MRB) report; and

(b) the aircraft type certificate holder’s maintenance planning document; and

2.5 Aircraft utilisation limitations affecting the validity of the program

2.5.1 The maintenance program must state any limitations that may affect the effectiveness of the program, or part of the program, for example in relation to:

(a) total flying hours or total number of flights;

(b) annual flying hours or annual number of flights;

2.6 Schedule of maintenance

2.6.1 The maintenance program must include 1 or more schedules that set out:

(a) the maintenance to be regularly carried out on the aircraft or an aeronautical product for the aircraft in accordance with the requirements mentioned in section 2.8; and

(b) any other the maintenance to be regularly carried out on the aircraft or an aeronautical product for the aircraft to ensure the continuing airworthiness and safe operation of the aircraft.

2.6.2 Each schedule must set out the following for the maintenance mentioned in it:

(a) a description of the maintenance;

(b) the interval for the maintenance;

(c) the source of the requirement for the maintenance, for example, a requirement of the MRB, a specific airworthiness directive (AD) requirement, an extended diversion time operation (EDTO) approval requirement, a company requirement;

(d) the maintenance data for the maintenance, or a reference to the maintenance data contained in another document;

(e) if the maintenance program applies to more than 1 aircraft — information that shows how the maintenance applies to each aircraft;

(f) if the maintenance is required by or under the approved design for the aircraft or an aeronautical product — information that shows that the maintenance is required by or under the approved design.

2.7 Schedule of life limited parts

2.7.1 The maintenance program for an aircraft with life-limited parts fitted to it must include a separate schedule containing the following:

(a) a description of the parts;

(b) the location of the parts on the aircraft;

2.8 Maintenance requirements

2.8.1 For paragraph 2.6.1 (a), the maintenance requirements are:

(a) either:

(i) the requirements in the ICA for the aircraft or an aeronautical product for the aircraft; or

(ii) requirements in another means of compliance with ICA mentioned in subsection 2.9.2; and

(b) either:

(i) the requirements in the ADs for the aircraft or an aeronautical product for the aircraft; or

(ii) requirements in the means of compliance with the ADs as mentioned in paragraph 39.002 (c) or (d) of CASR 1998; and

(i) an EDTO approval under Civil Aviation Order (CAO) 82.0;

(ii) an RVSM operational approval under regulation 181M of the Civil Aviation Regulations 1988 (CAR 1988);

(iii) a navigation authorisation under Subpart 91.U of CASR 1998.

Note EDTO has the meaning given by paragraph 2.1 of CAO 82.0. RVSM operational approval has the meaning given by regulation 181E of CAR 1988.

2.9 Compliance with ICA

2.9.1 The maintenance program for an aircraft complies with the requirements in the ICA for the aircraft and aeronautical products for the aircraft that relate to maintenance to be regularly carried out on the aircraft and aeronautical products if:

(a) the maintenance is set out in the schedule mentioned in section 2.6; and

(b) the scope and extent of the maintenance set out in the schedule is not less than the scope and extent of the maintenance in the ICA; and

(c) the maintenance interval set out in the schedule is not less restrictive than the maintenance interval in the ICA; and

(d) the maintenance data set out or referred to in the schedule:

(i) are the same as the procedures in the ICA for carrying out the maintenance; or

(ii) have been approved in accordance with section 1.12 of this MOS or paragraphs 145.A.45 (b) or (d) in the Part 145 MOS.

2.9.2 CASA may approve a proposed maintenance program, or a variation to an approved maintenance program, that does not comply with a requirement in the ICA that relates to maintenance to be regularly carried out on the aircraft and aeronautical product if:

(a) the program provides another means of compliance with the requirement in the ICA; or

(b) non-compliance with the requirement is supported by technical justification including data derived from an approved reliability program for the aircraft; or

(c) CASA is satisfied that non-compliance with the requirement will have no adverse effect on the continuing airworthiness of the aircraft.

2.10 One-off extension to maintenance task interval

2.10.1 If the ICA for the aircraft or an aeronautical product provide for a one-off extension to the interval for certain maintenance in the maintenance program, the maintenance program may provide for a one-off extension to the interval in accordance with the ICA.

2.10.2 If the ICA do not provide for a one-off extension to the interval for certain maintenance in the maintenance program, the maintenance program may provide for a one-off extension to the interval but only in accordance with the following criteria:

(a) for intervals expressed in calendar time such as days, months or years — the maximum permitted extension is 10% of the interval or 3 months, whichever is lesser;

(b) for intervals expressed in units other than calendar time — the maximum permitted extension is 10% of the interval, or 200 units of the interval, whichever is lesser.

Note For example, if the interval for a particular maintenance is 3000 cycles, the maximum permitted extension is 200 cycles and not 10% of the interval which amounts to 300 cycles.

2.10.3 A one-off extension is not permitted under this section for any of the following:

(a) maintenance required by or under the approved design for the aircraft or aeronautical product, for example airworthiness limitation, certification maintenance requirement;

(b) maintenance required by an AD;

2.10.4 An extension under this section to the interval for certain maintenance in the maintenance program must not extend the subsequent occurrence of the maintenance.

Note For example, if as a result of an extension, certain maintenance having an interval of 1 000 hours is carried out at 1 050 hours, the maintenance must next be carried out no later than 950 hours after the previous maintenance, to preserve the 1 000 hour interval.

Chapter 3

Requirements for approved reliability program

3.1 Introduction

3.1.1 This Chapter specifies for paragraph 42.020 (2) (k) of CASR 1998, the requirements for a reliability program for an aircraft that requires a reliability program under regulation 42.155 of CASR 1998.

3.2 General requirements

3.2.1 The reliability program must:

(a) be in writing; and

(b) define the meaning of any unique terms or acronyms used in the program; and

(i) the program; and

(ii) any subsequent variations to the program.

Note Common terms used throughout the industry need not be defined as long as the same meaning is intended.

3.3 Identification and applicability of the program

3.3.1 The reliability program must contain the following information:

(a) the type, model, serial number and registration mark of the aircraft controlled by the program;

(b) the name and address of the registered operator of the aircraft controlled by the program;

3.4 Objective of the program

3.4.1 The objective of the reliability program must be described in the program.

3.4.2 The applicable instructions for continuing airworthiness must be followed to establish the objective of the program.

3.4.3 As a minimum, the reliability program must provide a means of ensuring maintenance program tasks are effective and their periodicity is adequate for continuing airworthiness of the aircraft.

3.5 Identification of items controlled by the program

3.5.1 The aircraft parts, systems and structural elements controlled by the reliability program must be clearly defined and identified in the program.

3.5.2 The maintenance program tasks controlled by the program must be clearly identified in the program.

3.5.3 Where some items, such as aircraft structure, engines, and auxiliary power units, are controlled by a separate program, such as a manufacturer structural sampling or life development program, this must be referenced in the program.

3.6 Administration of the program

3.6.1 The individuals responsible for the administration of the reliability program must be identified and their responsibility must be described in the program.

3.7 Data collection

3.7.1 A description of the data collection system for the items controlled by the reliability program must be included in the program. Such a description must include the following:

(a) identification of sources of data;

(b) procedures for transmission and receiving of data from each source;

(d) organisational responsibilities for each step of data development.

3.7.2 The data collected must be:

(a) obtained from items functioning under operational conditions; and

(b) accurate and factual to support a high degree of confidence in any derived conclusion; and

3.7.3 Examples of sources of data include the following:

(a) pilot reports;

(b) unscheduled removals;

(d) sampling inspections;

(e) workshop findings;

(f) functional checks;

(g) bench checks.

Note All of the above sources may not necessarily be covered in each and every program. The scope and objective of the program, and items controlled by the program, will dictate the nature and source of data.

3.8 Performance standards

3.8.1 The reliability program must include a performance standard expressed in mathematical terms for each item covered by the program that defines the acceptable level of reliability for the item. The following are some of the commonly used performance standards:

(a) premature removal rates for an item;

(b) confirmed failure rates for an item;

(d) flight delays or cancellation rates due to defect in, or failure of, an item;

(e) internal leakage rates for an item.

3.8.2 Upper and lower limits may be used to express performance standards. This represents a reliability band or range by which the reliability is interpreted.

3.8.3 The program must describe the methods and data to be used for establishment of the performance standard.

3.8.4 The performance standard must be responsive and sensitive to the level of reliability experienced. It must not be so high that even abnormal variations would not cause an alert, or so low that it is constantly exceeded in spite of corrective action measures.

3.8.5 The performance standards must be based on the operator’s own operating experience with the exceptions mentioned in subsection 3.8.6. The period of experience will be dependent on fleet size and utilisation.

3.8.6 If the operator’s operating experience of an aircraft type or model is non-existent or limited, performance standards may be based on 1 or more of the following as applicable:

(a) the experience of other operators of the same or a similar aircraft type or model;

(b) the operator’s own experience of a similar aircraft type or model;

(d) the expected in-service reliability values used in the design of the aircraft.

Note For paragraph (d), the values are normally quoted in terms of mean time between unscheduled removals or mean time between failure, for both individual product and complete systems.

3.8.7 The program must contain procedures for monitoring and reviewing performance standards at regular intervals to reflect the operating experience, product improvement and changes in procedures.

3.8.8 The program must provide for the review of the performance standards set in accordance with subsection 3.8.6, after the operator has gained sufficient operating experience.

3.9 Display of information

3.9.1 The reliability program must provide for a format of display that allows easy identification of trends, events and when performance standards are exceeded.

3.9.2 The display may be in graphical or in a tabular format or a combination of both.

3.9.3 The rules governing any separation or discarding of information before incorporation into the display must be stated in the program.

3.9.4 The display of information must include provision for “nil returns” to aid the examination of the total information.

3.10 Analysis and interpretation of information

3.10.1 The reliability program must provide for the regular analysis and interpretation of information generated by the program.

3.10.2 The method employed for analysing and interpreting the information must be explained in the program.

3.10.3 The methods used must:

(a) enable the performance of the items controlled by the program to be measured; and

(b) facilitate recognition, diagnosis and recording of significant problems.

3.11 Investigation and corrective action

3.11.1 The program must provide for an active investigation and, if applicable, implementation of corrective action when a performance standard is exceeded.

3.11.2 If upper and lower limits are used to express performance standards, the follow up requirements for each limit must be fully described in the program.

3.11.3 The procedures for implementing corrective actions and for monitoring the effectiveness of the corrective actions must be described in the program.

3.11.4 The procedures must include provision of periodic feedback to the individual responsible for taking the corrective action until such time as performance has reached an acceptable level.

3.11.5 Corrective actions must correct any reduction in reliability revealed by the program and may take the form of 1 or more of the following:

(a) changes to maintenance, operational procedures or techniques;

(b) changes to maintenance program tasks, including escalation or de-escalation of tasks, addition, modification or deletion of tasks;

(d) initiation of modifications to aircraft and aeronautical products;

(e) changes to provisioning of spare parts for maintenance;

(f) changes to manpower and equipment planning for maintenance;

(g) training of maintenance personnel.

3.11.6 Where applicable, each corrective action must include a planned completion date.

3.12 Evaluation and review of the program

3.12.1 The reliability program must provide for continuous monitoring of the effectiveness of the program as a whole and identify each individual who is responsible for this monitoring.

3.12.2 The program must contain procedures for implementing changes to the program and identify the individual responsible for proposing and preparing the changes.

Note There may be more than 1 responsible individual.

3.13 Pooling of data

3.13.1 For a reliability program for a small fleet of aircraft, it is permitted to “pool” data, that is, to collate data from a number of operators of the same type of aircraft.

3.13.2 For this section, a small fleet of aircraft is a fleet of less than 6 aircraft of the same type.

3.13.3 For the analysis to be valid, the following things for the aircraft from which data is pooled must be substantially the same:

(a) aircraft configuration;

(b) aircraft age and utilisation rate;

(d) maintenance program and maintenance procedures.

3.13.4 The program must describe the pooling arrangement and the types and extent of data to be pooled.

Chapter 4

This Chapter is reserved for future use.

Chapter 5

This Chapter is reserved for future use.

Chapter 6

Carrying out maintenance on Australian aircraft outside Australian territory

6.1 Introduction

6.1.1 Under regulation 42.301 of CASR 1998, an organisation is permitted to carry out maintenance outside Australian territory on an Australian aircraft to which Part 42 applies if certain conditions are met.

6.1.2 Under paragraph 42.301 (1) (a) of CASR 1998, the organisation must be approved to carry out the maintenance by the National Airworthiness Authority (NAA) of a foreign country under the law of that country.

6.1.3 Under paragraph 42.301 (1) (b) of CASR 1998, the country must be specified for regulation 42.301 of CASR 1998 in the Part 42 Manual of Standards.

6.1.4 In accordance with paragraph 42.301 (1) (b) of CASR 1998, this Chapter contains a list of those countries.

Note There are other requirements to be met before the maintenance can be carried out and certified.

Under paragraph 42.301 (1) (c) of CASR 1998, there must be an arrangement between CASA and the NAA to permit the organisation to carry out the maintenance (the NAA arrangement).

Under subregulation 42.301 (2) of CASR 1998, the organisation must carry out and certify the maintenance in accordance with the NAA arrangement between CASA and the NAA.

6.2 Countries specified for regulation 42.301 of CASR 1998

1 Singapore.

Chapter 7

Carrying out maintenance on an aeronautical product for an Australian aircraft outside Australian territory

7.1 Introduction

7.1.1 Under regulation 42.306 of CASR 1998, an organisation is permitted to carry out maintenance outside Australian territory on an aeronautical product for an Australian aircraft to which Part 42 applies if certain conditions are met.

7.1.2 Under paragraph 42.306 (1) (a) of CASR 1998, the organisation must be approved to carry out the maintenance by the NAA of a foreign country under the law of that country.

7.1.3 Under paragraph 42.306 (1) (b) of CASR 1998, the country must be specified for regulation 42.306 in the Part 42 Manual of Standards.

7.1.4 In accordance with paragraph 42.306 (1) (b) of CASR 1998, this Chapter contains a list of those countries.

Note There are other requirements to be met before maintenance on an aeronautical product can be carried out and certified.

Under subregulation 42.306 (2) of CASR 1998, the organisation must carry out and certify the maintenance in accordance with an arrangement between CASA and the NAA, or under the law of the foreign country that granted the approval to carry out the maintenance.

7.2 Countries specified for regulation 42.306 of CASR 1998

1 Canada

2 Each member country of EASA

3 New Zealand

4 Singapore

5 United States of America

6 Japan

Note Under paragraph 42.306 (2) (a) of CASR, a foreign maintenance organisation that is permitted to carry out maintenance on aeronautical products for an Australian aircraft must, if there is an NAA arrangement (within the meaning of paragraph 42.306 (2) (a)), carry out the maintenance in accordance with the NAA arrangement. As at June 2022, the countries in respect of which there is an NAA arrangement are Singapore, under an agreement dated 22 April 2013, and Japan, under an agreement dated 25 March 2022.

Chapter 8

This Chapter is reserved for future use.

Chapter 9

Aviation industry standards

9.1 Introduction

9.1.1 Paragraph 42.020 (2) (l) of CASR 1998, provides that the Part 42 MOS may specify that a document is an aviation industry standard.

9.1.2 This Chapter specifies the documents that are aviation industry standards for the definition of maintenance data in the CASR dictionary.

9.2 Aviation industry standards

9.2.1 The following list specifies the documents that are aviation industry standards for the definition of maintenance data in the CASR dictionary:

LIST

1. Federal Aviation Administration Advisory Circular AC 43.13 1B, Acceptable Methods, Techniques, and Practices — Aircraft Inspection and Repair.

2. Federal Aviation Administration Advisory Circular AC 43.13 2B, Acceptable Methods, Techniques, and Practices — Aircraft Alterations.

3. Federal Aviation Administration Advisory Circular AC 65-9A [Large AC], Airframe & Powerplant Mechanics General Handbook.

4. Federal Aviation Administration Advisory Circular FAA AC-65-15A [Large AC], Airframe & Powerplant Mechanics Airframe Handbook.

5. Federal Aviation Administration Advisory Circular AC 65-12A [Large AC], Airframe & Powerplant Mechanics Powerplant Handbook.

Chapter 10

Aeroplanes and helicopters of particular type and model that are specified as large aircraft

10.1 Introduction

10.1.1 Paragraph 42.020 (2) (c) of CASR 1998, provides that the Part 42 MOS may specify that a particular type and model of aeroplane is a large aircraft for the definition of large aircraft in the CASR dictionary.

10.1.2 Paragraph 42.020 (2) (d) of CASR 1998, provides that the Part 42 MOS may specify that a particular type and model of helicopter is a large aircraft for the definition of large aircraft in the CASR dictionary.

10.1.3 This Chapter specifies the type and model of aeroplanes and helicopters that are large aircraft for the definition of large aircraft in the CASR dictionary.

10.2 Aeroplanes and helicopters that are large aircraft

10.2.1 Aeroplanes specified in Table 1 are large aircraft for the definition of large aircraft in the CASR dictionary.

10.2.2 Helicopters specified in Table 2 are large aircraft for the definition of large aircraft in the CASR dictionary

Table 1
Aeroplane type certificate holder Aeroplane type andmodel designator
Nil
Table 2
Helicopter type certificate holder Helicopter type and model designator
Nil

Chapter 11

Aeroplanes and helicopters of particular type and model that are specified as small aircraft

11.1 Introduction

11.1.1 Paragraph 42.020 (2) (e) of CASR 1998, provides that the Part 42 MOS may specify that a particular type and model of aeroplane is a small aircraft for the definition of small aircraft in the CASR Dictionary.

11.1.2 Paragraph 42.020 (2) (f) of CASR 1998, provides that the Part 42 MOS may specify that a particular type and model of helicopter is a small aircraft for the definition of small aircraft in the CASR Dictionary.

11.1.3 This Chapter specifies the type and model of aeroplanes and helicopters that are small aircraft for the definition of small aircraft in the CASR dictionary.

11.2 Aeroplanes and helicopters that are small aircraft

11.2.1 Aeroplanes specified in Table 1 are small aircraft for the definition of small aircraft in the CASR dictionary.

11.2.2 Helicopters specified in Table 2 are small aircraft for the definition of small aircraft in the CASR dictionary.

Table 1
Aeroplane type certificate holder Aeroplane type and model designator
Air Tractor 400500800
Table 2
Helicopter type certificate holder Helicopter type and model designator
Nil

Chapter 12

Documents issued under the law of a foreign country that are authorised release certificates

12.1 Introduction

12.1.1 Paragraphs 42.020 (2) (a) and (b) of CASR 1998, provide that the Part 42 MOS may specify that a specified kind of document issued under the law of a specified foreign country is an authorised release certificate within the meaning of paragraphs (b) and (d) of the definition of authorised release certificate in the CASR Dictionary (the ARC definition).

12.1.2 This Chapter specifies the kind of documents issued under the law of a foreign country that are authorised release certificates within the meaning of paragraphs (b) and (d) of the ARC definition.

12.2 Documents that are authorised release certificates for new aeronautical products, the manufacture of which has been permitted under the law of a foreign country

12.2.1 For a new aeronautical product on which maintenance has not been carried out, a document:

(a) issued under the law of a foreign country that has permitted the manufacture of the product; and

(b) that certifies that the product has been manufactured in conformity to its approved design data; and

(d) that identifies the country referred to in paragraph (a); and

(e) that identifies the organisation responsible for issuing the document and its authority to do so; and

(f) that is identified as an authorised release certificate; and

(g) that includes its date of issue; and

(h) that includes the name and signature of the individual who issued it on behalf of the organisation;

is an authorised release certificate within the meaning of paragraph (b) of the ARC definition.

12.3 Documents that are authorised release certificates for aeronautical products on which maintenance has been carried out under the law of a foreign country

12.3.1 For an aeronautical product on which maintenance has been carried out, a document:

(a) issued under a law of a foreign country that has permitted the carrying out of the maintenance and that is specified in Table 12.3.1; and

(b) that meets the requirements of subsection 12.3.2;

is an authorised release certificate within the meaning of paragraph (d) of the ARC definition.

Table 12.3.1

Specified countries

Canada

Any country that is an EASA memberSee Note

New Zealand

Singapore

United States of America

Japan

Note The membership of EASA is subject to change. As at 31 January 2020, specified EASA member countries are as follows: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and Switzerland. If in doubt, the inclusion of a country in EASA should be confirmed.

12.3.2 For paragraph 12.3.1 (b), the document must:

(a) describe the maintenance that has been carried out; and

(b) certify that the maintenance has been carried out in accordance with the law of the foreign country that has permitted the carrying out of the maintenance; and

(d) identify the foreign country referred to in paragraph (b); and

(e) identify the organisation responsible for issuing the document and its authority to do so; and

(f) be identified as an authorised release certificate; and

(g) include its date of issue; and

(h) include the name and signature of the individual who issued it on behalf of the organisation.

Chapter 13

This Chapter is reserved for future use.

Chapter 14

This Chapter is reserved for future use.

Chapter 15

Maintenance for items 4 and 5 of Table 42.300 of CASR 1998

15.1 Introduction

15.1.1 Paragraph 42.020 (2) (i) of CASR 1998 provides that the Part 42 MOS may specify maintenance for items 4 and 5 of Table 42.300 of CASR 1998.

15.1.2 Regulation 42.300 of CASR 1998 provides that an individual mentioned in an item of the Table 42.300 of CASR 1998 is permitted to carry out maintenance on an Australian aircraft to which Part 42 applies subject to the conditions mentioned in the table for the item.

15.1.3 Items 4 and 5 of the table 42.300 of CASR 1998 mentions that a pilot licence holder or a flight engineer, may carry out maintenance on a large aircraft or an aircraft authorised to operate under an AOC if:

(a) the pilot licence holder or the flight engineer is a member of the aircraft’s flight crew; and

(b) the pilot licence holder or the flight engineer is authorised under regulation 42.630 of CASR 1998 to carry out the maintenance; and

15.1.4 This Chapter sets out maintenance for items 4 and 5 of Table 42.300 of CASR 1998.

15.2 Maintenance for items 4 and 5 of Table 42.300 of CASR 1998

15.2.1 The following list specifies the maintenance for items 4 and 5 of Table 42.300 of CASR 1998.

LIST

1. A pre-flight or daily inspection or an inspection that is equivalent to a pre-flight or daily inspection in the aircraft maintenance program.

2. Replacement of bulbs and lights.

3. Replacement of seats, if the replacement does not involve disassembly of any part of the primary structure of the aircraft.

4. Replenishment of a system fluid other than a gas.

5. Maintenance that is required for the application of a minimum equipment list if the maintenance does not involve any of the following:

(a) removal or disassembly of parts;

(b) disassembly of control systems;

6. Maintenance required by an airworthiness directive, if the airworthiness directive permits a pilot licence holder or a flight engineer to carry out the maintenance.

Note to Part 42 Manual of Standards

The Part 42 Manual of Standards (in force under the Civil Aviation Safety Regulations 1998) as shown in this compilation comprises Manual of Standards Part 42 amended as indicated in the Tables below.

Table of Manual of Standards and Amendments

Year and number	Date of registration on FRLI	Date of commencement	Application, saving or transitional provisions
MOS 42	18 February 2011 (see F2011L00279)	27 June 2011	—
MOS 42 2011 Amendment No. 1	22 June 2011 (see F2011L01194)	27 June 2011	—
MOS 42 2013 Amendment No. 1	7 June 2013 (see F2013L00929)	8 June 2013	—
MOS 42 2014 Amendment No. 1	19 June 2014 (see F2014L00748)	19 June 2014	—
Part 42 Manual of Standards Amendment Instrument 2022 (No. 1)	20 December 2022 (see F2022L01708)	21 December 2022	—

Table of Amendmentsad. = added or inserted am. = amended rep. = repealed rs. = repealed and substituted
Provision affected How affected
s. 1 rs. MOS 42 2011 No. 1
s. 1B rep. Legislation Act 2003, s 48D
s. 2 am. MOS 42 2011 No. 1
s. 3 rep. MOS 42 2011 No. 1
Schedule heading rep. MOS 42 2011 No. 1
s. 1.1 am. MOS 42 2011 No. 1
s. 1.2 am. MOS 42 2011 No. 1
s. 1.4 am. MOS 42 2011 No. 1
s. 1.5 am. MOS 42 2011 No. 1
s. 1.6 am. MOS 42 2011 No. 1
s. 1.7 am. MOS 42 2011 No. 1
s. 1.8 am. MOS 42 2011 No. 1
s. 1.9 am. MOS 42 2011 No. 1
s. 1.10 am. MOS 42 2011 No. 1
s. 1.11 am. MOS 42 2011 No. 1
s. 1.12 am. MOS 42 2011 No. 1
s. 1.13 am. MOS 42 2011 No. 1
s. 1.14 am. MOS 42 2011 No. 1
s. 1.10 am. MOS 42 2011 No. 1
Chapter 6 ad. MOS 42 2013 No. 1
Chapter 7 ad. MOS 42 2013 No. 1
s. 7.2 am. MOS 42 2014 No. 1, F2022L01708
s. 12.2 rs. MOS 42 2014 No. 1
s. 12.3 am. F2022L01708

Below is a practical compliance checklist mapped to the MOS sections. This is an operational roadmap for CAMOs, operators and practitioners responsible for continuing airworthiness.

Prepare and maintain the CAME (s 1.2.1).
- Ensure the exposition includes: accountable manager signed statement, detailed scope of services, names of accountable manager, continuing airworthiness manager and substitutes, responsible manager(s), quality manager, organisational chart, descriptions of facilities, lists of airworthiness review and maintenance program approval employees, procedures for exposition changes and documented compliance procedures.
- Keep an auditable revision history of the CAME and make change procedures explicit.
Facilities and record systems (ss 1.3.1-1.3.2; s 1.15.1).
- Provide office accommodation that permits staff to work without undue distraction (s 1.3.2).
- Implement secure, retrievable record systems compliant with s 1.15: protection from damage, unintended alteration and loss and quick retrieval capability.
Appoint and document key personnel (ss 1.4-1.10).
- Appoint an accountable manager with corporate authority; document scope of authority (s 1.4).
- Appoint responsible managers with the experience and knowledge thresholds; collect and retain proof of their qualifications and experience for at least two years after they leave (s 1.5.5, 1.5.8).
- For AOC-holder CAMOs, appoint a continuing airworthiness manager who meets qualification, experience and reporting requirements; nominate a substitute and retain documentary evidence for two years (ss 1.6.1-1.6.10).
- Nominate a quality manager where required; ensure the person is independent from the continuing airworthiness manager and meets audit training and experience thresholds (ss 1.7.1-1.7.5).
- Create written authorisations for airworthiness review employees and maintenance program approval employees, with scope, type/model limits and identification reference numbers; retain authorisations for two years after cessation (ss 1.9.2-1.9.9, 1.10.2-1.10.11).
Establish and operate a quality system or internal review function (ss 1.13-1.14).
- For CAMOs managing large aircraft/AOC aircraft, implement the written quality system with independent audits, annual audit plan, recording and reporting of findings to accountable/responsible managers, and corrective/preventative action processes (s 1.13).
- For other CAMOs, develop an internal review schedule consistent with s 1.14 and retain review records for two years.
Design and control maintenance programs (Chapter 2).
- Draft maintenance programs in writing, identifying aircraft, engines, props, APU, registered operator, CAMO approval reference (ss 2.2-2.3).
- Reference the latest ICA, MRB reports, maintenance planning documents and AMM (s 2.4).
- Include schedules that describe tasks, intervals, sources, maintenance data references and applicability across fleet (ss 2.6.1-2.6.2).
- If proposing deviations from ICA, prepare technical justifications, reliability data where available, and submit to CASA under s 2.9.2.
Manage one-off interval extensions within MOS limits (s 2.10).
- Apply numerical caps for extensions (10% or 3 months for calendar intervals; 10% or 200 units for other intervals). Do not apply one-off extensions to AD-required work, airworthiness-limitation items or replacement of life-limited parts.
Implement and document reliability programs where required (Chapter 3).
- Produce a written program identifying items controlled, data collection sources and processes, mathematical performance standards, display formats, analysis methods, corrective actions with planned completion dates, and responsibilities for continuous monitoring (ss 3.2-3.12).
- For small fleets, ensure pooling arrangements meet the MOS’s substantial-similarity criteria and document the pooling agreement and data types (s 3.13).
If carrying out or sourcing maintenance overseas (Chapters 6-7).
- Verify that the foreign maintenance organisation is approved by an NAA listed in the MOS and that an NAA arrangement exists where required; follow the NAA arrangement’s terms (s 6.1.2-6.1.4, s 7.1.2-7.1.4).
- For maintenance on aeronautical products, confirm foreign ARCs meet MOS criteria in s 12.3.2 and are from a listed country (s 12.3.1).
Handle CAMO-created maintenance data with controlled procedures (s 1.12).
- Only create new procedures where no valid maintenance data exists or current data is inadequate; ensure CAMO has approval privilege under Subpart 42.J and the procedure is assessed for safety, identified as CAMO-created and traceable to the approval that authorised it (ss 1.12.1-1.12.4).
Document and retain audits, authorisations and personnel qualification proof.

Keep audit findings, individuals performing the audit, scope and date, and corrective action records for at least two years (s 1.13.5-1.13.6).
Retain authorisations and qualification records for specified two-year windows (ss 1.9.9, 1.10.11).

Map MOS role requirements to licensing and training regimes.

Ensure personnel qualifications are matched to Part 66 licensing levels or equivalent qualifications listed in ss 1.6.3, 1.10.4 and 1.9.4.

Seek early CASA engagement for non-standard proposals.

When relying on alternate means of compliance, pooled data, cross-border maintenance or CAMO-created maintenance data, secure CASA approval/confidence in writing under the relevant MOS provisions (e.g. s 2.9.2, Chapter 6/7 notes, s 1.12.2).

Keep the MOS and CASA materials under review.

Because Ch 6, 7 and 12 contain lists that may change with bilateral arrangements and EASA membership, regularly check CASA publications and NAA arrangements to confirm current acceptances.

Following this checklist produces the documentary evidence and organisational architecture the MOS requires and reduces the operational risk that a CASA audit or compliance review will identify deficiencies.

Part 42 Manual of Standards

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