AD/CL-600/91 - Fuel System Safety

This Directive rests on a small set of concrete technical and regulatory concepts drawn directly from the AD text and the referenced maintenance manual revision.

• Applicability: All Model CL-600-2B19 aircraft, all serial numbers. The AD explicitly applies to the entire model type listed (AD header “Applicability: Model CL-600-2B19 aircraft, all serial numbers”).
• Approved maintenance schedule revision: The AD repeatedly instructs operators to “revise the approved maintenance schedule by incorporating” the listed inspection/maintenance tasks from CSP A-053 Rev 7 Part 2 Appendix D (Requirements 1 and 3). The AD does not re-state the content of the maintenance tasks beyond referring to task numbers and short task descriptions; it requires incorporation of the detailed tasks as published in the manual revision.
• Specific maintenance tasks: The AD identifies task numbers and short descriptions:
  • 28-11-00-601: Detailed inspection of the critical bonding jumpers for corrosion and damage.
  • 28-11-00-602: Function check of the critical bonding jumpers.
  • 28-11-00-603: Detailed inspection of the sealant on the in-tank LRUs.
  • 28-11-00-604: Detailed inspection of the fuel tank wiring harness clipping along the front and rear spar of the centre and wing fuel tanks for condition and security.
  • 29-33-01-601: Function check of the hydraulic system No. 1, No. 2 and No. 3 reservoir temperature transducer.
  • 29-33-01-602: Discard (i.e. remove from service) of the hydraulic system No. 1, No. 2 and No. 3 reservoir temperature transducer.
• Hours-based thresholds triggering immediate action: The AD deploys total time-in-service (TIS) thresholds to determine which aircraft require initial inspections or immediate discard of components:
  • Aircraft with more than 15 000 hours TIS on the effective date must carry out the initial inspection of Requirement 1 tasks (Requirement 2).
  • Aircraft with more than 27 500 hours TIS on the effective date must carry out task 29-33-01-602 (Requirement 5).
• Compliance windows: The AD prescribes compliance timeframes:
  • Incorporation of tasks into the approved maintenance schedule (Requirements 1 and 3): within 60 days after the effective date (i.e. within 60 days of 31 January 2008).
  • Initial inspections for aircraft over 15 000 hours TIS (Requirement 2): within 5 000 hours TIS after the effective date.
  • If the initial check of 29-33-01-601 has not been done, Requirement 4 requires it “within 5 000 hours TIS after the effective date.”
  • Task 29-33-01-602 for aircraft above 27 500 hours TIS: initially within 2 500 hours TIS after the effective date.
• Safety policy/integration: The Background ties the AD to Bombardier’s system safety review against Chapter 525 fuel tank safety standards (NPA 2002-043) and to Transport Canada Policy Letter No. 525-001; the AD therefore (by its own account) operationalises a manufacturer update prompted by regulatory fuel-tank safety rules.
• Cross-reference to other regulator action: The AD notes “Transport Canada AD CF-2007-29 refers,” signalling a recognition of related regulatory action by Canada’s authority.

These concepts together convert manufacturer-recommended maintenance tasks, identified in a fuel-system safety review, into compulsory actions with fixed compliance windows for Australian-registered CL-600-2B19 aeroplanes.

The Directive names the aircraft model and the maintenance tasks; from that we can identify the affected parties and the locus of decision and cost.

• Aircraft operators and owners of CL-600-2B19 aeroplanes: The Directive applies to “Model CL-600-2B19 aircraft, all serial numbers.” Primary obligations fall on the operator or owner with responsibility for the aircraft’s approved maintenance schedule. The AD requires revision of “the approved maintenance schedule,” thereby imposing a duty on the entity that holds or manages that approved schedule (typically the operator, airworthiness management organisation or the maintenance organisation acting under the operator’s authority).
• Approved maintenance schedule holders and maintenance organisations: Requirement 1 and 3 specifically require revision of the approved schedule to incorporate tasks from CSP A-053 Rev 7 Part 2 Appendix D. The maintenance organisation performing the revision, and the certifying authority who accepts the revised schedule, will be involved. The AD does not name the approval mechanism but the instruction to “revise the approved maintenance schedule” makes the approved-schedule holder the decision point for implementation and record-keeping.
• Licensed maintenance personnel: The tasks listed include detailed inspections (bonding jumpers, sealants, wiring-harness clips) and function checks. These require competent licensed maintenance engineers/technicians to carry out the inspections and any subsequent maintenance or replacements (for the discarded transducers).
• Operators with high-utilisation aircraft: The AD uses TIS thresholds (15 000 and 27 500 hours on the effective date) to trigger immediate inspections or discards. Aircraft that exceed those thresholds on 31 January 2008 are required to act sooner. Therefore, operators whose fleets contain high-hour airframes are affected sooner and may bear concentrated short-term costs.
• Supply chain and parts providers: Requirement 5 requires discarding hydraulic system reservoir temperature transducers on aircraft above 27 500 hours TIS. Those removed components will need replacement; maintenance shops and parts suppliers for the CL-600-2B19 will therefore experience demand for replacement transducers. The AD itself does not specify replacement part numbers or lead times; it only orders the discard task 29-33-01-602.
• Regulators and safety delegates: The AD is issued by the Civil Aviation Safety Authority (CASA) (signed by Charles Lenarcic, Delegate of CASA). CASA will be the enforcing regulator for Australian-registered aircraft subject to the AD. The AD also cross-references Transport Canada’s AD CF-2007-29, so the regulatory response is coordinated to an extent with Canadian action.

Who pays: the Directive imposes direct costs on aircraft operators and maintenance organisations. Operators pay for inspections, functional checks, any replacements required after inspection or after discarded transducers, and for schedule-administration and downtime. The Directive’s Background frames the tasks as preventive measures to address potential ignition sources, but the document explicitly assigns responsibility for incorporating and carrying out the tasks to operators via the approved maintenance schedule requirements.

Who decides: operators (or their airworthiness management/maintenance approval holders) decide how to schedule the mandated tasks into maintenance windows, subject to the compliance deadlines in the AD. The AD prescribes what must be done and by when; it does not set methods beyond referencing the specified tasks in CSP A-053 Rev 7 Part 2 Appendix D.

The Directive imposes specific duties on operators and maintenance approval holders; it does not enumerate rights beyond the standard implication that compliance can be scheduled within the given windows and that the tasks are to be taken from the specified manual revision.

Key duties as stated in the text

• Incorporate specified inspection tasks into the approved maintenance schedule (Requirements 1 and 3): The operator must “Revise the approved maintenance schedule by incorporating the following inspection requirements as contained in Revision 7 of Canadair Regional Jet Model CL-600-2B19 Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, ‘Fuel System Limitations’” (Requirement 1). The same phrasing is used for Requirement 3 in relation to the hydraulic-reservoir-transducer tasks.
• Conduct initial inspections for aircraft above stated TIS thresholds (Requirement 2): “For aircraft with more than 15 000 hours total time in service (TIS) on the effective date of this Directive, carry out the initial inspection of the tasks detailed in Requirement 1.” The AD sets a compliance time for Requirement 2: “Within 5 000 hours TIS after the effective date of this Directive.”
• Carry out function checks and discards as required (Requirements 3-5): Requirement 3 lists the hydraulic reservoir temperature transducer tasks (29-33-01-601, 29-33-01-602). Requirement 4 directs operators to perform 29-33-01-601 if not already done. Requirement 5 requires aircraft with more than 27 500 hours TIS on the effective date to “carry out task number 29-33-01-602 detailed in Requirement 3.”
• Meet the compliance windows (Compliance section): The AD specifies timeframes for each Requirement. For Requirements 1 and 3, incorporation into the schedule is “Within 60 days after the effective date of this Directive.” For Requirement 5, the initial performance is “Within 2 500 hours TIS after the effective date.”

Implicit duties and administrative expectations

• Record-keeping and maintenance-schedule approval: The AD instructs operators to revise the “approved maintenance schedule,” which implies maintenance-schedule revision must be recorded and, where applicable, accepted by the approving authority or maintained as required under the operator’s continuing airworthiness processes. The text does not prescribe the record format or the approval route, but the duty to revise an “approved” schedule implies that the entity responsible for approval must accept the change and that records must exist proving incorporation.
• Determination of TIS at the effective date: Several Requirements apply only to aircraft above particular TIS thresholds “on the effective date.” That creates a duty for operators to determine and document the aircraft’s TIS as at 31 January 2008.

Rights and prescriptive limits in the Directive

• Prescriptive content is limited to incorporating the tasks as written in the referenced manual: the AD does not propose alternative methods or deviations; it requires the tasks “as contained in Revision 7 of ... CSP A-053 ... Appendix D.” The operator’s ability to adopt alternative means of compliance is not addressed in the text of the AD.
• Compliance windows allow some scheduling discretion: The AD prescribes when actions must occur (e.g. within 60 days; within 5 000 hours TIS), not the exact dates/times of inspections; operators retain discretion about how to schedule the work within the compliance window, subject to operational constraints.

What the AD does not do

• The Directive does not list any procedural appeal or alternative-compliance process within its text, nor does it set out sanctions or enforcement steps. It does not specify who approves the revised maintenance schedule, but the wording “approved maintenance schedule” presupposes an existing approval regime applicable to the operator or maintenance organisation.

In short, the Directive imposes affirmative duties to adopt specific inspection/maintenance items into an operator’s approved maintenance schedule and to carry out inspections and component discards within specified hours- and time-based windows. The operator must document TIS as at the effective date, schedule the inspections, and perform or arrange for the function checks and discards described by the task numbers incorporated from CSP A-053 Rev 7 Part 2 Appendix D.

The AD text itself does not set out penalties or detailed enforcement mechanisms. The Directive declares: “This Airworthiness Directive becomes effective on 31 January 2008,” but it contains no schedule of penalties, civil fines, or criminal sanctions in the provided text.

What the Directive states

• The AD gives mandatory instructions (e.g. “Revise the approved maintenance schedule ...”), prescribes compliance times, and applies to all CL-600-2B19 aircraft. It contains an explicit effective date and a signature by the CASA delegate, which confirms that the measures are intended as binding airworthiness instructions.

What is absent from the text

• No penalties or enforcement procedures are specified in the AD document provided. The AD does not specify how CASA will monitor or verify compliance, what documentary evidence operators must lodge, or the consequences of non-compliance (suspension of operations, grounding, fines). The instrument does not claim to prescribe remedial or enforcement steps in this text.

Consequences that follow from the nature of an AD (contextual note grounded in the document’s status)

• The instrument is an Airworthiness Directive issued by CASA and a CASA delegate signed it. By its nature as an AD, it converts maintenance tasks into mandatory airworthiness actions for the affected aircraft in Australia. The AD itself does not describe enforcement measures; regulatory enforcement, inspections, audits, or administrative sanctions would follow under the broader CASA regulatory framework rather than being enumerated in the AD text. The AD does cross-reference a Transport Canada AD, indicating international regulatory alignment on the identified issues.

Practical implications for operators

• Operators should treat the AD as obligatory and implement the required maintenance-schedule revisions and inspections within the specified windows. Because the AD contains no enforcement detail in the provided text, operators should assume CASA will use its usual oversight mechanisms to ensure compliance; operators should therefore update records, schedule and document the inspections, and be prepared to demonstrate compliance to CASA upon request.

If confirmation of enforcement powers, sanctions, or alternative-compliance mechanisms is required, operators will need to consult CASA’s regulatory framework, enforcement policy, or direct CASA guidance outside the four corners of this AD, because those elements are not contained in the Directive text as provided.

The Directive explicitly situates itself in a network of technical standards and other regulator action. The AD text names several regulatory and technical documents and makes one cross-reference to another authority’s AD.

Direct references inside the AD

• Chapter 525 of the Airworthiness Manual and NPA 2002-043: The Background explains that Bombardier’s system safety review was conducted “against fuel tank safety standards introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002-043.” The Directive therefore operates as a corrective measure responding to the requirements set out in Chapter 525 as introduced by the NPA.
• Transport Canada Policy Letter No. 525-001: The Background states that identified non-compliances were assessed “using Transport Canada Policy Letter No. 525-001” to determine if mandatory corrective action was required. That indicates the manufacturer/regulator assessment referenced an established policy for handling fuel tank safety non-compliances.
• Revision 7 of CSP A-053 Part 2 Appendix D: The Directive requires operators to incorporate tasks “as contained in Revision 7 of Canadair Regional Jet Model CL-600-2B19 Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, ‘Fuel System Limitations’.” The AD therefore converts a manufacturer maintenance-manual revision into a regulatory requirement.
• Transport Canada AD CF-2007-29: The AD states “Note: Transport Canada AD CF-2007-29 refers.” This cross-reference points to parallel action by Canada’s regulator and indicates that the technical measures are aligned with or derived from the Canadian authority’s response.

Interaction with operators’ continuing-airworthiness obligations

• The AD commands incorporation into the “approved maintenance schedule.” That interacts with the operator’s obligations under Australia’s airworthiness regime to maintain an approved continuing-airworthiness programme. Operators must therefore harmonise this AD with their existing approved maintenance schedules and any other regulatory obligations they owe under CASA rules.

Inter-jurisdictional regulatory coordination

• The explicit reference to Transport Canada AD CF-2007-29 and to Transport Canada policy and NPA documents signals regulatory coordination on fuel-tank safety across jurisdictions. The AD itself is an Australian instrument, but it draws on Bombardier’s review and Canadian regulatory work as its technical basis.

What the Directive does not specify about interaction

• The Directive does not state how conflicts (if any) between the revised CSP A-053 tasks and an operator’s existing approved maintenance programme are to be resolved, nor does it specify an approval or acceptance process for the revised schedule beyond the instruction to revise the “approved maintenance schedule.” It therefore leaves to existing administrative and regulatory processes (outside the AD text) the mechanics of approval, amendment of maintenance schedules, and demonstration of compliance.

In practice, operators must align the AD with their CASA-approved procedures and any bilateral or jurisdictional requirements that apply to their specific operations. The AD’s cross-reference to Transport Canada material indicates where operators may look for additional technical detail, but the binding instruction in Australia is the CASA AD itself.

The Directive text provided contains no explicit amendment or later-variation history. The document sets out the AD number (AD/CL-600/91), the subject (Fuel System Safety), and includes dates indicating issuance and effect:

• Issued/signed date: 16 January 2008 (signature block reads “Charles Lenarcic, Delegate of the Civil Aviation Safety Authority, 16 January 2008”).
• Effective date: “This Airworthiness Directive becomes effective on 31 January 2008.”

There is no textual content in the provided AD that records amendments to this Directive, supersessions, or later revisions. The AD does, however, reference Revision 7 of the manufacturer’s Maintenance Requirements Manual (CSP A-053 Part 2 Appendix D) as the source of the tasks to be incorporated. That means the technical content is tied to that manual revision rather than to an internal amendment history recorded in the AD.

If an operator requires later amendment history (for example, whether CASA later varied the AD, extended compliance windows, or revoked it), that information is not present in the document supplied here and must be sought in CASA’s AD register or other CASA publications. The AD itself neither lists prior versions nor subsequent amendments.

Other useful document links named in the AD (for tracing change drivers)

• NPA 2002-043 (Chapter 525 fuel-tank standards introduction): this Notice of Proposed Amendment is the origin of the fuel-tank safety standards referenced.
• Transport Canada Policy Letter No. 525-001: used by Bombardier/Transport Canada in assessing whether mandatory corrective action was required.
• Transport Canada AD CF-2007-29: cross-reference to a corresponding Canadian AD that “refers,” which may contain parallel or predecessor measures.

In short, the AD’s internal amendment history is silent; the AD records issuance and effective dates and points to technical sources (manual revision, NPA, policy letter, Transport Canada AD) that explain the technical change and its genesis.

The document provided contains no litigation history, and it does not cite any legal proceedings, appeals, or judicial decisions. The AD is a technical safety directive issued by the Civil Aviation Safety Authority (CASA) and signed by a delegate; the text itself contains no references to court challenges, administrative appeals, or case law.

If readers need to know whether this AD has been subject to legal challenge, or whether any legal rulings have interpreted the obligations here (for example, on what constitutes proper incorporation into an approved maintenance schedule, or on enforcement), that information is not present in the supplied AD and must be sought from CASA records, court databases, or regulatory guidance outside the document.

The AD does cross-reference Transport Canada AD CF-2007-29 and the regulatory background (NPA 2002-043, Transport Canada Policy Letter No. 525-001). Those referenced instruments might themselves have administrative records or regulatory consultations, but the AD itself does not report litigation or appeals.

Operators and maintenance organisations should note several concrete operational, compliance and administrative pitfalls that arise directly from the text.

1. Distinction between “incorporate into the approved maintenance schedule” and “perform the task soon”

   • The AD requires operators to “revise the approved maintenance schedule by incorporating” the listed tasks (Requirements 1 and 3) within 60 days after the effective date. Incorporation into the approved maintenance schedule is distinct from performing individual inspections; operators must both amend the schedule and, where applicable, perform immediate inspections required by hours-TIS thresholds. Don’t assume schedule amendment alone discharges the obligation where initial inspections are also mandated for higher-TIS aircraft.

2. Hours-based compliance windows and the need to record TIS as at the effective date

   • Several Requirements turn on the aircraft’s total time in service “on the effective date of this Directive.” The compliance windows for initial actions are then expressed in TIS hours after the effective date (e.g. Requirement 2: aircraft with >15 000 hours TIS on the effective date must carry out the initial inspection within 5 000 hours TIS after the effective date). Operators must accurately determine and document each aircraft’s TIS at 31 January 2008. If record-keeping is incomplete or inconsistent, operators may fail to identify which aircraft require earlier action (e.g. the 27 500-hour threshold in Requirement 5).

3. Short calendar deadline for incorporation (60 days) versus hours-based inspections

   • Incorporation of tasks into the approved maintenance schedule must occur within 60 days after 31 January 2008. That is a short calendar window to revise approval documentation, adapt maintenance planning and inform maintenance organisations. Operators should not postpone the schedule revision while they plan inspections, because the Directive separately requires incorporation within that 60-day window.

4. Task 29-33-01-602 is a discard requirement

   • Task 29-33-01-602 is not an inspection but a discard of the hydraulic reservoir temperature transducer. For aircraft above 27 500 hours TIS on the effective date, Requirement 5 mandates carrying out that discard initially within 2 500 hours TIS after the effective date. Discarding a component implies replacement with a conforming spare if the aircraft is to remain serviceable; parts availability, lead times, and associated certification of replacement parts should be checked in advance.

5. The AD references CSP A-053 Rev 7 Part 2 Appendix D for details; the Directive does not reproduce full task instructions

   • The AD provides task numbers and short descriptions but not step-by-step procedures, inspection intervals beyond initial requirements, or the acceptance criteria. Operators must obtain Revision 7 of CSP A-053 Part 2 Appendix D and ensure the exact procedures and intervals are fully understood and correctly incorporated. Failure to incorporate the complete text could lead to non‑compliance.

6. No alternative compliance procedure is set out in the AD text

   • The AD does not describe an acceptable alternative means of compliance or an approval route for deviations. If an operator considers an alternative method to address the identified hazard, they will need to engage CASA through ordinary channels for approval or an alternative means of compliance, as the AD does not provide one.

7. Cross-reference to Transport Canada AD and policy does not automatically make Canadian compliance acceptable to CASA

   • The AD notes “Transport Canada AD CF-2007-29 refers.” That is a helpful cross-reference to related action, but Australian operators should not assume compliance records demonstrating compliance with the Canadian AD will automatically satisfy CASA without documentation showing the action taken corresponds exactly to the tasks and compliance windows specified here.

8. The AD does not specify evidence or reporting format for compliance

   • The AD requires revision of the approved maintenance schedule and the performance of inspections/discards, but it does not specify how operators must document compliance or report to CASA. Operators should treat their standard continuing-airworthiness recordkeeping processes as the primary evidence but should be prepared to produce documentation demonstrating TIS at the relevant dates, the schedule revision, and work-order records for inspections and discards.

9. Potential fleet-wide scheduling pressure

   • Because the AD applies to “all serial numbers” and includes short calendar deadlines for schedule incorporation, operator networks that rely on centralized maintenance slots or that have many affected aircraft may face capacity constraints. The AD’s compliance windows may concentrate demand for inspections and transducer replacements, creating scheduling challenges and potential operational disruption.

10. Scope of safety rationale versus mandated action

    • The Background explains the actions are aimed at preventing potential ignition sources inside the fuel system as identified in a system safety review. Operators should note the AD implements specific preventative maintenance tasks derived from that review; the AD does not declare the aircraft groundings or limit operations while work is scheduled,operators must reconcile operational decisions with the technical risk and with duty to comply.

Those “gotchas” are concrete operational and administrative friction points that flow directly from the Directive’s language on tasks, compliance windows, and thresholds.

The AD prescribes actionable steps; below is a practical compliance checklist distilled from the Directive text coupled with implementation guidance that follows from the AD’s concrete requirements.

1. Confirm applicability and inventory

   • Confirm whether each aircraft in your fleet is a Model CL-600-2B19; the AD explicitly covers “Model CL-600-2B19 aircraft, all serial numbers.”
   • For each affected aircraft, determine and document total time in service (TIS) as at the effective date (31 January 2008). Several Requirements hinge on whether an aircraft exceeded 15 000 or 27 500 hours TIS on the effective date.

2. Obtain the referenced manual revision

   • Acquire Revision 7 of the Canadair Regional Jet Model CL-600-2B19 Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, “Fuel System Limitations.” The AD requires incorporation of the inspection and maintenance tasks “as contained” in that revision; the AD itself provides only task numbers and short descriptions.

3. Revise the approved maintenance schedule (Requirements 1 and 3)

   • Within 60 days after the effective date (i.e. within 60 days of 31 January 2008), formally revise your operator’s approved maintenance schedule to incorporate:
     • Tasks 28-11-00-601, 28-11-00-602, 28-11-00-603, 28-11-00-604 (Requirement 1).
     • Tasks 29-33-01-601 and 29-33-01-602 (Requirement 3).
   • Ensure the revised schedule documents the exact task wording, intervals and acceptance criteria as per CSP A-053 Rev 7 Part 2 Appendix D.
   • Retain records of the schedule revision and the date of incorporation; the AD requires incorporation within a short calendar window and you will need to demonstrate the schedule change.

4. Perform required initial inspections based on TIS thresholds

   • For any aircraft that had more than 15 000 hours TIS on 31 January 2008: perform the initial inspections for the tasks in Requirement 1 within 5 000 flight hours TIS after the effective date, as per Requirement 2.
   • For any aircraft that had more than 27 500 hours TIS on 31 January 2008: perform task 29-33-01-602 (discard of the hydraulic reservoir temperature transducer) initially within 2 500 hours TIS after the effective date, as per Requirement 5.
   • If the initial check for task 29-33-01-601 (hydraulic reservoir temperature transducer function check) has not already been accomplished, do so within 5 000 hours TIS after the effective date (Requirement 4).

5. Plan logistics for discards and replacements

   • Task 29-33-01-602 requires discarding the hydraulic reservoir temperature transducer on affected aircraft. Establish availability of replacement transducers (part numbers and lead times as per vendor/manufacturer documentation) and plan procurement so that discard does not result in extended aircraft downtime.
   • Ensure maintenance personnel are authorised to fit replacement parts in accordance with the operator’s approval and the aircraft’s parts catalogue.

6. Execute inspections with appropriate personnel and procedures

   • Assign licensed maintenance personnel or appropriately authorised persons to carry out the detailed inspections and function checks specified by the tasks. The AD references “detailed inspection” and “function check” tasks; use the procedures and acceptance criteria in the CSP A-053 Rev 7 manual.
   • For inspections of bonding jumpers, sealant, and wiring-harness clipping, ensure access panels and fuel-system protocols are followed. While the AD does not reproduce procedural steps, CSP A-053 Rev 7 will include the procedural content.

7. Record and retain evidence of compliance

   • Create and retain work-order records, inspection reports, components removed, spare part serial numbers, and dates/hours TIS at which the work occurred.
   • Document the TIS calculation for the effective date for each aircraft and include it in the continuing airworthiness records.
   • Record the maintenance-schedule revision and evidence that the revision was placed into the approved maintenance programme within 60 days.

8. Coordinate with CASA and, if relevant, with foreign authorities

   • While the AD does not set out reporting or approval mechanics, be prepared to present evidence of schedule revision and of performed inspections to CASA on request. The AD is signed by a CASA delegate and becomes effective within the Australian regulatory regime.
   • The AD notes “Transport Canada AD CF-2007-29 refers.” If your operator is part of an international group or shares maintenance approvals across jurisdictions, coordinate records to show equivalence between Canadian actions and the CASA AD where relevant.

9. Assess resource and capacity needs

   • Expect concentrated demand for maintenance slots because the AD applies to all serial numbers and imposes short calendar deadlines on schedule incorporation (60 days). If your operator has multiple CL-600-2B19 airframes, plan for available hangar time, personnel, and spare parts to avoid operational disruption.

10. If an alternative method is contemplated, engage CASA early

• The AD does not provide an alternative means of compliance. If you consider an alternative method to achieve the same safety objective, prepare a technical justification and consult CASA early to seek approval, following CASA’s ordinary alternative-compliance or exemptions process (outside the AD text).

11. Cross-check against CSP A-053 Rev 7 and manufacturer service information

• Use the manual revision as authoritative technical content for inspection procedures, intervals and acceptability criteria. The AD requires incorporation “as contained in Revision 7 ... Appendix D.” Don’t rely on summaries or task descriptions in the AD alone.

12. Monitor for any subsequent ADs or revisions

• Although the AD supplied here does not list amendments, operators should monitor CASA notices and the AD register for any subsequent modification, clarification, or superseding directive.

By following those steps and maintaining careful TIS records and inspection documentation, an operator can implement the Directive’s requirements while minimising operational disruption. The AD’s explicit references to CSP A-053 Rev 7 Part 2 Appendix D mean the manual revision is the technical source to be followed; the AD itself specifies only which tasks must be incorporated and the compliance windows.