The AD rests on a small number of tightly defined technical concepts and cross‑references to an external service bulletin and an FAA AD. Those concepts are the proper functioning and allowable wear of landing gear pivot bushings, measurement of cumulative slack at the wheel axle, prevention of inadvertent unthreading of the emergency landing gear pull‑down drive screw, and proper adjustment of the emergency extension system.

Key technical elements stated in the AD:

• Measurement metric and limit: the AD specifies a single numerical tolerance, 3/8 of an inch, as the maximum permissible total fore‑and‑aft wheel travel caused by bushing slack. The measurement point is the centre of the axle and the travel is the cumulative slack in worn bushings (Requirement 1(a)).

• Measurement conditions: measurements must be taken with the hydraulic pressure relieved on the landing gear system and with the gear in two distinct positions: (i) unlocked, intermediate and near the full‑down position but not fully down; and (ii) with the gear just entering the wheel well. The AD requires compliance if either position shows travel exceeding 3/8 inch (Requirement 1(a)).

• Corrective action: where the travel exceeds 3/8 inch, the landing gear assembly must be “repaired as necessary” to reduce travel to less than 3/8 inch (Requirement 1(a)). The AD does not specify repair methods or parts; it directs operators to repair “as necessary”.

• Parts installation and fixation: the AD requires installation of a spacer emergency landing gear pull‑down system in accordance with TEMCO Service Bulletin No. 28 to prevent inadvertent unthreading of the drive screw (Requirement 1(b)). The AD therefore incorporates by reference the technical method and component specification found in that TEMCO bulletin.

• Adjustment standard for emergency extension: the AD requires inspection and adjustment of the emergency extension system “in accordance with paragraphs 8, 9 and 12” of TEMCO Service Bulletin No. 28 (Requirement 1(c)). The AD therefore delegates the substantive adjustment specification to those paragraphs.

• Cross‑reference to FAA AD: Note 1 identifies FAA AD 51‑11‑04 as the source document for this AD’s requirements. Note 2 makes explicit that the phrase “as in force from time to time” requires operators to use the most recent version of the referenced TEMCO Service Bulletin.

Structurally, the AD uses a standard regulator approach: it sets observable requirements (inspect and measure to a numerical limit) and links those requirements to a manufacturer/service bulletin for hardware installation and adjustment details. It sets recurring intervals for inspections (every 100 hours or 12 months whichever first, after an initial compliance period) but leaves repair techniques and parts procurement to the operator and maintenance organisation subject to the AD and TEMCO SB instructions.

The AD’s risk control logic, as stated in the Background, is that equivalent FAA requirements have previously existed and an audit found the Australian register lacked mandated equivalence, therefore the AD imposes the FAA‑equivalent measures in Australia. The AD treats the TEMCO Service Bulletin as the technical source for gear pull‑down spacer installation and emergency system adjustment, and it requires operators to track the current version due to the “as in force from time to time” language.

The AD explicitly applies to “All Swift Museum Foundation GC‑1A and GC‑1B model aircraft.” That language identifies the scope of affected aircraft on the Australian Aircraft Register; the AD was issued after an audit identified Swift Museum Foundation GC‑1A aircraft on the register for which FAA‑equivalent AD requirements had not been mandated in Australia (Background). The practical consequences follow a supply‑chain and organisational map:

• Owners and operators of Swift Museum Foundation GC‑1A and GC‑1B aeroplanes on the Australian register. These parties carry the direct compliance responsibility to arrange the inspections, measurements, repairs and the installation of the spacer emergency pull‑down system as required by the AD and to schedule recurrent inspections at the stated intervals.

• Maintenance organisations and certificated maintenance personnel who perform the inspections, repairs and installations on affected aircraft. They must follow the measurement procedure (hydraulic pressure relieved; two gear positions) and the numerical tolerance (3/8 inch) required by the AD, and must implement the spacer installation and emergency extension adjustment per TEMCO Service Bulletin No. 28, paragraphs 8, 9 and 12 (Requirement 1).

• Suppliers and manufacturers of parts: specifically, parties that can supply a spacer compatible with the TEMCO Service Bulletin No. 28 installation requirements, and any replacement bushings or gear components needed to reduce fore‑and‑aft travel to less than the specified limit after repairs. Operators will need to obtain TEMCO Service Bulletin No. 28 (the AD requires compliance “as in force from time to time”), so access to that technical document and any parts it prescribes is necessary.

• Civil Aviation Safety Authority (CASA) as the issuing regulator and its delegate (named in the AD as the delegate of CASA, Pieter van Dijk) who authored and issued the AD. CASA determines the commencement date (17 September 2020) and frames the AD as mandating FAA‑equivalent requirements (Background and Notes).

• Auditors and continuing airworthiness managers whose duties include ensuring that the operator’s maintenance schedule and record‑keeping reflect compliance with the AD. Although the AD text does not itself prescribe record‑keeping procedures, recurring inspection intervals mean maintenance programmes and scheduling practices will have to be updated by affected operators.

Who pays: the source text does not provide cost information or specify subsidies. The AD places the practical burden of inspection, repair and installation on operators and their maintenance providers. Costs will include labour for inspections at the specified intervals, parts (spacer and any required replacement bushings or components), and any downtime while repairs and installations are performed.

Who decides: the AD prescribes “must” obligations for operators and maintenance organisations, and it references TEMCO Service Bulletin No. 28 “as in force from time to time” for technical installation and adjustment steps, so operators must follow the current version of that service bulletin. CASA, via its delegate, issued the AD; any decisions about alternative methods of compliance or deferrals are not specified in the AD text.

Behaviour change: the AD imposes an inspection‑and‑repair regime on landing gear pivot bushings and an installation task to prevent unthreading of the emergency pull‑down drive screw. Operators need to introduce or amend maintenance scheduling, procure the specified TEMCO components/documentation, and perform recurring inspections every 100 hours’ time in service or every 12 months, whichever occurs first, per the AD’s compliance schedule.

The AD creates a short list of mandatory duties for operators and maintenance personnel (the text uses mandatory language such as “must” and “required”):

Duties (explicit in the AD text)

• Inspect all bushings in all landing gear pivot points for wear that would permit fore‑and‑aft travel of the main landing gear; measure cumulative slack‑caused travel at the centre of the axle (Requirement 1(a)). The measurement must be performed with hydraulic pressure relieved and with gear in two positions specified in the AD (Requirement 1(a)(i) and (ii)). If travel exceeds 3/8 of an inch in either position, the operator must repair the landing gear assembly as necessary to reduce travel to less than 3/8 inch (Requirement 1(a)).

• Install the spacer emergency landing gear pull‑down system in accordance with TEMCO Service Bulletin No. 28 (Requirement 1(b)). The AD instructs operators to follow the TEMCO document “as in force from time to time” (Note 2).

• Inspect and adjust the emergency extension system in accordance with paragraphs 8, 9 and 12 of TEMCO Service Bulletin No. 28 (Requirement 1(c)).

• Meet the AD’s specified compliance timing windows. For Requirements 1(a) and 1(c): unless previously accomplished, perform the initial action within 6 months after the AD’s commencement date and thereafter at every 100 hours’ time in service or every 12 months, whichever occurs first. For Requirement 1(b): unless previously accomplished, perform the action at 100 hours’ time in service or 12 months, whichever occurs first.

• Use the most recent version of TEMCO Service Bulletin No. 28 where the AD references it, because the AD’s Note 2 makes the phrase “as in force from time to time” operative.

Rights or procedural lacunae (as found in the AD text)

• The AD specifies actions and timings but does not include a provision within the text for alternative methods of compliance (AMOC), deviations, or temporary exemptions; the AD likewise does not set out an appeals procedure or administrative review step within its wording. The AD simply states the requirements, compliance intervals and commencement date. An operator seeking an alternative method or relief will need to consult CASA processes outside the text of the AD.

• The AD does not itself provide a right to compensation, cost recovery, or supply of parts. It refers to TEMCO Service Bulletin No. 28 for the installation and adjustment details; operators need to obtain that SB and associated parts at their own expense.

• The AD does not specify record‑keeping obligations, but the recurring inspection schedule and “unless previously accomplished” language create an implicit expectation that operators can demonstrate the timing and completion of required actions. The AD does not prescribe the specific forms of records to be kept.

Points of legal and practical effect

• The AD is expressed as mandating actions for Australian‑registered GC‑1A and GC‑1B aircraft and is presented as implementing requirements equivalent to FAA AD 51‑11‑04 (Background and Note 1). Where the AD references external documents (the FAA AD and TEMCO Service Bulletin No. 28), the operator’s duty expands to include obtaining and applying the current versions of those documents where required by the AD (Note 2).

• The AD defines the technical compliance measure clearly in one place (3/8 inch at centre of axle) but leaves repair method, parts procurement and detailed installation/adjustment steps to the TEMCO Service Bulletin and to maintenance practice. That division assigns substantive procedural detail to the external SB while reserving compliance validation and scheduling to the operator.

• The AD differentiates the initial timing for different actions. Requirements 1(a) and 1(c) require initial compliance within 6 months of commencement if not previously done. Requirement 1(b) has initial compliance at the next 100 hours or 12 months, whichever occurs first. That divergence is material to scheduling and planning for operators.

The AD text itself does not set out civil or criminal penalties, nor does it describe enforcement mechanisms, sanctions or the administrative steps that CASA would take for non‑compliance. The instrument uses mandatory language (for example, “must not be more than 3/8 of an inch” and “must be repaired as necessary”) and declares that the AD “is issued to mandate requirements equivalent to FAA AD 51‑11‑04” (Background), but it contains no express penalty provisions or enforcement procedures within the text provided.

What the AD does provide that is relevant to enforcement:

• It identifies the issuer and delegate: the AD is signed by Pieter van Dijk, Delegate of the Civil Aviation Safety Authority, and it sets a commencement date of 17 September 2020 (commencement clause and signature block). The instrument therefore records that CASA, through its delegate, has issued a mandatory directive applicable to Australian‑registered GC‑1A and GC‑1B aircraft.

• The AD places specific measurable requirements and recurring intervals on operators. Measurable obligations (for example, the 3/8 inch limit and the specified inspection positions) create objective points against which compliance can be assessed, and the recurring inspection schedule (every 100 hours or 12 months) creates a timetable for verification.

Not stated in the AD (and therefore not established by this text alone):

• The AD does not say which administrative actions, breach notifications, revocations, or other enforcement steps CASA will follow for non‑compliance. The AD also does not indicate whether CASA considers failure to comply with the AD to be an immediate ground for grounding an aircraft, cancellation of certificates, or imposition of fines. Those enforcement mechanisms reside in broader aviation safety legislation and CASA enforcement policies outside the AD text itself.

Practical enforcement implication for operators and maintainers:

• Because the AD imposes mandatory instructions and quantifiable tolerances, operators should plan to be able to demonstrate completion of the specified inspections, repairs and installations within the required timescales. Even though the AD text does not specify penalties, a regulator could rely on other statutory powers or enforcement frameworks to address non‑compliance; the AD itself provides the technical standards that would be applied in any compliance assessment.

• The AD’s reference to TEMCO Service Bulletin No. 28 “as in force from time to time” creates an ongoing compliance obligation to use the current version of that SB where it is specified in the AD. Failure to apply the current SB as required by the AD could be treated as non‑compliance with the AD’s terms.

For a compliance plan, operators should assume the AD is mandatory and include in their maintenance control and safety management systems the work required by each obligation, the dates by which initial and subsequent inspections must be completed, and documentation to evidence compliance in the event of regulatory verification.

The AD explicitly cross‑references an FAA Airworthiness Directive and a manufacturer/service bulletin. It states that FAA AD 51‑11‑04 is the source document for the AD’s requirements (Note 1). It also requires actions “in accordance with TEMCO Service Bulletin No. 28, as in force from time to time” (Requirements 1(b) and 1(c); Note 2). Those cross‑references create specific interactions with external regulatory and technical sources, and they produce compliance obligations that reach beyond the text of the AD itself.

Specific interactions described in the AD:

• Equivalence with FAA AD: The Background clause says the AD is “issued to mandate requirements equivalent to FAA AD 51‑11‑04.” That establishes the AD’s function as an Australian regulatory instrument that aligns Australian obligations for the affected aircraft with the FAA AD’s requirements. The AD therefore interacts with FAA‑originating safety directives by reproducing the FAA AD’s technical regulatory effect on Australian‑registered aircraft.

• Incorporation by reference of TEMCO Service Bulletin No. 28: By requiring installation and adjustments “in accordance with” specified paragraphs of the TEMCO SB, and by stating that the SB must be complied with “as in force from time to time”, the AD creates a continuing requirement to follow the current TEMCO procedures. The AD delegates the substantive hardware specification and adjustment procedures to an external technical document.

Limitations of the AD’s express interaction:

• The AD does not reference or alter other specific Australian statutes, regulations, or administrative instruments within its text. It does not prescribe penalties, nor does it include an administrative review or appeal mechanism. Any enforcement or administrative consequences of non‑compliance will be determined under broader Australian aviation safety law and CASA policy outside the AD content.

• The AD does not amend or supersede any other ADs by explicit cross‑reference in the provided text. It simply states that the requirements are equivalent to the FAA AD and requires compliance with the TEMCO SB.

Operational interactions that operators should consider (implicit consequences rooted in the AD’s requirements):

• Maintenance schedules and continuing airworthiness management. Operators will need to integrate the AD’s inspection and installation requirements into their maintenance control and scheduling systems because the AD imposes initial and recurring intervals (within 6 months initially for some tasks; every 100 hours/12 months thereafter).

• Documentation and technical data management. Because the AD directs compliance with TEMCO Service Bulletin No. 28 “as in force from time to time”, operators must maintain access to up‑to‑date versions of that service bulletin and be prepared to demonstrate that they used the current version where the AD requires it.

• Parts supply and conformity. The AD’s requirement to install a spacer per TEMCO SB No. 28 will interact with any rules applicable to parts approval, supplier conformity and maintenance organisation capabilities, though the AD itself does not specify parts approval procedures. That interaction will depend on existing Australian rules applying to parts and modifications as enforced by CASA.

In sum, the AD interacts directly with FAA AD 51‑11‑04 and TEMCO Service Bulletin No. 28 by importing their requirements into the Australian regulatory context for the affected aeroplanes, while leaving other procedural and enforcement arrangements to general aviation safety law and CASA practice outside the AD text.

The text supplied contains a single amendment/issuance entry for AD/GC‑1/4, numbered 18/2020, and records a commencement date and signature. The AD is dated 25 August 2020 (signature block) and expressly states that it commences on 17 September 2020. The instrument also repeats the reference AD/GC‑1/4 and the internal identifier 18/2020 in several header lines, indicating the instrument number and year.

There is no further amendment history recorded in the supplied document. The AD itself requires compliance with a TEMCO Service Bulletin “as in force from time to time”, which implies that the external TEMCO SB may be amended and that operators must use the most recent TEMCO version when complying with the AD (Note 2). The AD does not, however, record any amendments to the AD text itself, nor does it set out a schedule or mechanism for future amendments of the AD. It also does not state that it supersedes any prior Australian ADs specific to these aircraft.

What the document shows (and does not show)

• Issuance: AD/GC‑1/4 was issued in 2020 and given the internal reference 18/2020; signed by the CASA delegate on 25 August 2020; commencement 17 September 2020.

• No in‑text history: the supplied text contains no earlier versions, no amendments, no revocation clause for previous ADs, no schedule for review, and no express transitional provisions other than the “unless previously accomplished” language in the compliance table.

• Reliance on external document versions: The AD uses the phrase “as in force from time to time” in respect of TEMCO Service Bulletin No. 28, which commits operators to the current SB version whenever the SB is referenced by the AD. Changes in TEMCO SB No. 28 would therefore affect the obligations under the AD without an AD amendment being necessary, since the AD explicitly directs compliance with the SB as it is in force at the time.

Operators and maintainers should therefore note that while the AD text appears static, the technical requirements the AD imports from TEMCO Service Bulletin No. 28 can change over time and will be binding when referenced by the AD if the operator is complying with the AD’s “as in force from time to time” instruction.

The supplied AD text contains no reference to litigation, legal challenges, judicial review, appeals, or any court proceedings relating to this AD. There is no litigation history recorded within the instrument, no mention of disputes or enforcement actions, and no reference to any case law or judicial decisions. The only legal/administrative statement in the document is that the AD is issued by a CASA delegate (Pieter van Dijk) and has a stated commencement date.

Consequently, based solely on the text provided:

• There is no litigation record in relation to AD/GC‑1/4 contained in this document.
• The AD does not record any prior or subsequent court decisions, appeals or challenges to its validity, scope or enforcement.

If a reader needs to identify any litigation or administrative review relating to this AD, that information would need to be sought from external sources (for example, CASA enforcement records, court registers, or litigation databases). The AD text itself does not supply any such material.

The AD contains several detail points and cross‑references that can be the source of confusion or operational vulnerability if misread. Those potential pitfalls, drawn only from the text of the AD, are:

1. Divergent initial compliance windows for different tasks

• Requirements 1(a) and 1(c) require initial action “within 6 months after the commencement date of this AD” unless previously accomplished, while Requirement 1(b) requires initial action “at 100 hours’ time in service or 12 months, whichever occurs first” unless previously accomplished. That divergence means an operator might assume all tasks share the same initial deadline and inadvertently delay installing the spacer beyond the AD’s specified timing. Carefully distinguishing the timing clauses is necessary to avoid missed compliance points.

2. “Unless previously accomplished”

• Each compliance clause begins with “Unless previously accomplished.” Operators must determine whether earlier maintenance or parts installations meet the AD’s standard. The AD does not define what constitutes satisfactory prior accomplishment (for example, whether an earlier installation of a spacer compliant with the TEMCO specification counts). Operators need to be able to show that any “previous accomplishment” met the AD’s technical requirements and referenced documents in force.

3. Measurement methodology and positional ambiguity

• The AD mandates measurement at the centre of the axle and that gear be tested in two positions: (i) “Unlocked and in an intermediate position near to, but not in, the full down position,” and (ii) “With the landing gear just entering the wheel well.” The phrase “near to, but not in, the full down position” and “just entering the wheel well” are qualitative and open to interpretation. Maintenance personnel should establish a reproducible method for positioning and documenting the gear positions to ensure consistent measurements and to avoid disputes about whether a measurement was made in the correct position.

4. Hydraulic pressure requirement

• The AD requires checking with “the hydraulic pressure relieved on the system.” The AD does not specify how to relieve hydraulic pressure or how long after relieving pressure measurements should be taken. Technicians must follow accepted maintenance procedures and any guidance in TEMCO Service Bulletin No. 28 to ensure that the measurement conditions meet the AD’s prescriptive requirement.

5. Reliance on TEMCO Service Bulletin No. 28 without text included

• The AD requires installation and inspections “in accordance with” TEMCO Service Bulletin No. 28 and explicitly indicates that paragraphs 8, 9 and 12 of that SB are relevant. The AD does not include the text of TEMCO SB No. 28. Operators must obtain the current TEMCO SB and ensure they comply with its content. The AD’s Note 2 means operators must also track updates to that SB.

6. Imperial measurement unit

• The AD uses inches (3/8 of an inch) as the compliance limit. Australian maintenance practices commonly use metric units in some contexts. Converting the tolerance and ensuring measurement tools and procedures correctly reflect the 3/8‑inch limit is essential; rounding or conversion errors could lead to incorrect compliance conclusions.

7. “Repair as necessary” is open‑ended

• Where travel exceeds 3/8 inch, the AD requires the landing gear assembly to be “repaired as necessary” to reduce travel below the limit, but it does not specify approved repair methods or parts. Maintenance organisations must select repair methods consistent with accepted airworthiness engineering practice and the TEMCO SB where relevant, but the AD does not outline an approved parts catalogue, leaving operators to manage conformity under existing maintenance approval frameworks.

8. Recurrence cadence may interact with aircraft utilisation

• The recurring interval is every 100 hours’ time in service or every 12 months, whichever occurs first. For low‑utilisation aircraft that fly fewer than 100 hours a year, the effective inspection will be annual. For high‑utilisation aircraft, inspections will be driven by hours. Operators must track both parameters and schedule inspections on whichever threshold is reached first.

9. No explicit recordkeeping or AMOC procedure in the AD text

• The AD does not prescribe a recordkeeping format or an alternative method of compliance (AMOC) process within the instrument. Operators must therefore refer to CASA’s broader regulatory framework for documentation, approvals or relief, and must be prepared to show how any prior work or alternative fixes satisfy the AD’s technical standards.

10. Interplay with FAA AD and currency of TEMCO SB

• The AD states that FAA AD 51‑11‑04 is the source document and requires compliance with TEMCO SB No. 28 “as in force from time to time.” Operators must ensure that any interpretations of the FAA AD or TEMCO SB are made on the most current available versions, as required by the AD, and must document that they used the current documents at the time they performed the mandated tasks.

Each of these points is drawn from the AD text and creates practical implementation hazards. Operators and maintainers should read the AD precisely, secure the current TEMCO Service Bulletin No. 28 and the FAA AD referenced, and build clear, documented procedures for measurement, repair decisions and scheduling of recurring inspections.

The AD specifies discrete technical actions and timings. The following is a practical, step‑oriented compliance checklist that follows the AD text closely; it is framed as an operational checklist and is drawn only from the AD’s requirements and notes.

1. Establish applicability

• Confirm that the aircraft is a Swift Museum Foundation GC‑1A or GC‑1B model and that it is on the Australian register. The AD applies to “All Swift Museum Foundation GC‑1A and GC‑1B model aircraft.”

2. Obtain referenced documents

• Obtain the current version of TEMCO Service Bulletin No. 28 and FAA AD 51‑11‑04. The AD identifies FAA AD 51‑11‑04 as the source document and requires compliance with TEMCO Service Bulletin No. 28 “as in force from time to time” (Notes 1 and 2). Ensure records show the version and date of the TEMCO SB used for compliance.

3. Schedule initial compliance tasks according to the AD’s timing

• Requirements 1(a) and 1(c): If not previously accomplished, schedule the initial inspections and adjustments within 6 months after the AD commencement date (17 September 2020). After that, schedule recurring inspections every 100 hours’ time in service or every 12 months, whichever occurs first.

• Requirement 1(b): If not previously accomplished, schedule the installation of the spacer emergency landing gear pull‑down system at the next 100 hours’ time in service or within 12 months, whichever occurs first.

Note the AD’s “unless previously accomplished” language applies to each requirement; if prior work already satisfies a requirement in a way that meets the AD’s standards, document how that prior work conforms.

4. Perform inspections of pivot bushings (Requirement 1(a))

• Before measuring, relieve hydraulic pressure from the landing gear system as required by the AD.

• Position the landing gear in the two required positions: i) Unlocked and in an intermediate position near to, but not in, the full‑down position. Ensure a reproducible method for setting this intermediate position and record the procedure used. ii) With the landing gear just entering the wheel well. Again, use a consistent method for placing the gear in this position and document it.

• Measure total fore‑and‑aft travel of the wheels due to cumulative slack in the bushings at the centre of the axle. The AD sets the compliance limit at 3/8 of an inch. Use a measured, documented method and appropriate calibrated tools to determine the total travel.

• If the travel in either position is more than 3/8 inch, repair the landing gear assembly as necessary to reduce the travel to less than 3/8 inch. The AD does not prescribe repair steps or parts; ensure repairs are carried out in accordance with approved maintenance procedures and any guidance in TEMCO Service Bulletin No. 28 where applicable.

5. Install spacer emergency landing gear pull‑down system (Requirement 1(b))

• Follow TEMCO Service Bulletin No. 28’s installation procedure exactly, ensuring the version used is current. The purpose of the spacer is to prevent inadvertent unthreading of the drive screw. The AD requires installation “in accordance with TEMCO Service Bulletin No. 28, as in force from time to time.”

• Record the parts used, part numbers, and the TEMCO SB revision used for the installation.

6. Inspect and adjust the emergency extension system (Requirement 1(c))

• Perform inspection and adjustment of the emergency extension system “in accordance with paragraphs 8, 9 and 12 of TEMCO Service Bulletin No. 28.” Ensure those paragraphs from the current TEMCO SB are used and document the adjustments performed.

7. Recurring inspections and scheduling

• For Requirements 1(a) and 1(c), after initial compliance, schedule recurring inspections at every 100 hours’ time in service or every 12 months, whichever occurs first.

• For Requirement 1(b), observe the initial installation timing at the next 100 hours or 12 months if not previously accomplished. The AD does not specify recurring replacement of the spacer; however, follow any TEMCO SB guidance on continued inspection or replacement intervals for the installed spacer.

8. Documentation and evidence of compliance

• Although the AD does not specify recordkeeping formats, maintain records that show: a) Date of each inspection/installation/repair. b) Aircraft time in service at each action (hours). c) Personnel and organisation performing the work. d) TEMCO Service Bulletin revision used and FAA AD reference. e) Measurement data showing travel recorded at the axle centre and the positions in which measurements were made. f) Description of any repairs performed to reduce travel below 3/8 inch, including parts and engineering approvals if applicable.

9. Parts sourcing and conformity

• Obtain spacers and any replacement bushings or components compatible with TEMCO Service Bulletin No. 28 requirements. The AD places the technical specification for the spacer and the emergency extension adjustment in the TEMCO SB.

10. Clarify ambiguities with CASA or the SB author as needed

• Where the AD contains potentially ambiguous positioning language (for example, “near to, but not in, the full down position”) or where prior work may be claimed as “previously accomplished,” consult CASA or the TEMCO SB author for clarification if necessary. The AD text does not contain an internal AMOC or dispute resolution clause; therefore, early clarification reduces the risk of non‑conformance.

11. Training and tools

• Ensure maintenance personnel are trained in the specific measurement procedures (including relieving hydraulic pressure safely), gear positioning techniques, TEMCO SB installation and adjustment steps, and in using the measuring instruments calibrated to the required tolerances (3/8 inch).

12. Audit trail for regulator inspection

• Keep a traceable audit trail of compliance actions and the TEMCO SB version used, so that if CASA or an auditor seeks verification, the operator can demonstrate that the AD’s requirements and the SB version current at the time were applied.

Following these steps will align an operator with the AD’s explicit requirements. The AD frames the technical details in measurable terms where it does so (3/8‑inch limit, two gear positions, hydraulic pressure relieved) and assigns detailed installation/adjustment details to the TEMCO Service Bulletin No. 28, so full compliance requires integrating both the AD text and the current TEMCO SB content into the operator’s maintenance programme.