AD/CL-600/108 - Air Driven Generator Power Feeder Harness

The directive rests on a short chain of engineering and procedural concepts set out in the AD text and referenced service material. Those concepts, and their operational implications, are as follows.

ADG power feeder harness: the targeted component is the harness that supplies electrical power from the Air Driven Generator to the aircraft essential bus. The directive isolates failure risk to the harness's wire type and its routing/interaction with connector hardware.

Wire type distinction (Kapton versus non-Kapton): the AD makes a binary determination central to compliance: whether the harness uses Kapton-insulated wire. The directive prescribes an inspection to categorise the wire type (Part A of the Bombardier SBs) and ties subsequent action to that categorisation. If wires are Kapton, replacement is mandated; if not, replacing is not required beyond completing the Part A inspection.

Accomplishment Instructions / Service Bulletins: compliance is cast as execution of specific instructions in Bombardier SB 600-0737 or SB 601-0591 (both dated 23 July 2007). The AD distinguishes Part A (inspection procedure, sufficiency if non-Kapton) and Part B (replacement procedure if Kapton). The AD expressly allows "Later revisions of the above SBs, approved by the Chief, Continuing Airworthiness, Transport Canada" to be used for compliance, thus conditioning acceptable alternative procedures on Transport Canada's approval.

Temporal compliance window: the AD creates a compliance window between the effective date and the compliance date. The AD becomes effective on 2 July 2009 and requires completion "Before 19 July 2011." The inspection/replacement obligation is therefore not immediate in the sense of same-day grounding, but time-limited.

Root-cause and safety rationale: the background recites two field reports where post-deployment checks showed the ADG failed to power the essential bus. Inspections revealed Kapton wire chafing on the backshell of connector P1XC, causing short circuits, wire damage and disconnection. The AD explicitly links that failure mode, when combined with a dual generator failure, to loss of emergency power and an adverse effect on controllability.

Cross-reference to Transport Canada and the specific AD: the AD refers to Transport Canada AD CF-2009-18 and places reliance on Bombardier SBs. The AD was issued by a CASA delegate but explicitly accepts later SB revisions only with Transport Canada Chief approval, reflecting inter-jurisdictional reliance on the Canadian continuing airworthiness authority and on the manufacturer’s service documentation.

Conditional completion: the directive includes a completion rule: if inspection shows non-Kapton wiring, then executing Part A is sufficient and "compliance with Directive is complete." That creates a single decisive inspection outcome that avoids unnecessary replacement where the risk-laden material is absent.

Collectively, the main concepts define a narrowly targeted safety intervention: identify the specific wiring on particular airframes, and replace any identified Kapton wiring with non-Kapton harness per manufacturer instructions, within a stated deadline and subject to cross-authority SB approval.

The AD names the specific aircraft models and serial number ranges and therefore directly affects a defined set of aircraft owners, operators and maintainers. The AD text lists three model variants and ranges:

• CL-600-1A11 (600 Variant), serial numbers 1004 through 1085;
• CL-600-2A12 (601 Variant), serial numbers 3001 through 3066;
• CL-600-2B16 (601-3A Variant), serial numbers 5001 through 5131.

Owners/operators of aircraft within those serial number ranges bear the primary obligation to have the inspection carried out, and to have any required replacement executed. The AD's use of "If not previously accomplished, inspect..." signals that aircraft for which the inspection or equivalent action has already been completed may have different immediate obligations, but the operator remains responsible for establishing prior compliance.

Maintenance organisations and certifying staff are affected because the AD requires execution "in accordance with the Accomplishment Instructions" in specified Bombardier Service Bulletins (SB 600-0737 or SB 601-0591, dated 23 July 2007). That places a procedural obligation on maintenance providers to follow a manufacturer-prescribed method for inspection and replacement. The AD’s permissive language regarding later SB revisions is conditional: later revisions are acceptable only if approved by the "Chief, Continuing Airworthiness, Transport Canada," so maintainers must ensure any revised SB they rely on has that approval.

Parts suppliers and logistics chains are affected to the extent replacement harnesses or non-Kapton wiring are required. Where the inspection reveals Kapton wire, the AD requires replacement "in accordance with the Accomplishment Instructions in Part B" of the relevant SB, implying procurement of approved replacement harness assemblies or components that match the SB instructions.

Regulatory actors are implicated: the directive is issued under CASA authority (signed by a CASA delegate), but it cross-references Transport Canada AD CF-2009-18 and places approval authority for later SB revisions with Transport Canada’s Chief, Continuing Airworthiness. This creates an inter-jurisdictional linkage for acceptable revisions and record-keeping. The AD text itself identifies the delegate of CASA (James Coyne) as the issuer, establishing the enforcing administration.

Aeroplane conveyances that fall outside the listed serial ranges, or other types, are not captured by this AD as written. The AD's applicability language ("CL-600 series aeroplanes as follows: ... [listed models and serial ranges]") therefore excludes other CL-600 aircraft not within those serial ranges, and it excludes other aircraft types. Where an operator has multiple CL-600 family aircraft, only those within the listed serial ranges are directly affected by this particular instrument.

Finally, auditors, insurers and safety oversight entities will need to note the AD's compliance date and evidence trail: operators will be expected to hold documentation that the required inspection (Part A) and replacement (if required) were performed before the compliance date, or that the inspection had been previously accomplished.

Duties set out in the AD are prescriptive and sequential. Rights and definitional completion points are minimal and narrowly framed by the AD text.

Primary duties

• Inspect the ADG power feeder harness for wire type if the inspection has not been previously performed. The AD instructs: "If not previously accomplished, inspect the Air Driven Generator (ADG) power feeder harness for wire type, in accordance with the Accomplishment Instructions in Part A of Bombardier Service Bulletin (SB) 600-0737 or 601-0591 (as applicable), both dated 23 July 2007."

• Replace the ADG power feeder harness if the inspection identifies Kapton wire. The AD requires: "If the wire type is Kapton, replace the ADG power feeder harness in accordance with the Accomplishment Instructions in Part B of SB 600-0737 or 601-0591 (as applicable)."

• Complete these actions within the stated compliance timeframe. The AD provides that compliance must be completed "Before 19 July 2011," and that the AD becomes effective on 2 July 2009.

Conditional completion rule

• The AD contains an affirmative completion rule: "If the wire type is not Kapton, complete the instruction in Part A of the applicable SB and compliance with Directive is complete." That is, completion of Part A suffices where the hazardous material is absent, removing any obligation to progress to Part B.

Permitted procedure alternatives

• The AD permits later revisions of the referenced Bombardier SBs to be used: "Later revisions of the above SBs, approved by the Chief, Continuing Airworthiness, Transport Canada are acceptable for compliance with this Directive." This affords operators and maintainers a specified route to use updated manufacturer instructions, but only where those updated SBs have the named Transport Canada approval.

Issuer and effective date

• The AD is issued by the Civil Aviation Safety Authority via its delegate and is effective 2 July 2009. The issuer is identified as James Coyne, Delegate of the Civil Aviation Safety Authority.

Rights (as stated or implied by the AD)

• Completion-based right: operators have the right to consider the Directive satisfied after completing Part A if inspection shows non-Kapton wiring, as the AD so states.

• Revision-based right: operators may use later SB revisions for compliance if those revisions carry approval by the Chief, Continuing Airworthiness, Transport Canada. That creates a right to rely on updated technical instructions once the named authority has approved them.

What the AD does not state as rights or duties

• The AD text does not specify a process for requesting an extension of time, for seeking alternative means of compliance, or for lodging a formal objection; it does not articulate a dispute resolution or exemption process within the AD itself.

• The AD does not set out consequences, penalties or enforcement mechanisms in the text provided; it records the action required and the timelines but does not articulate sanctions within the instrument.

Documentation and proof

• While the AD requires execution "in accordance with the Accomplishment Instructions," the AD does not specify documentation format or retention periods. Operators and maintainers must therefore ensure they follow standard regulatory practice for recording compliance with ADs (the AD text itself supplies the procedural references , SB Part A and B , but not the administrative documentary requirements).

Sequencing and previous compliance

• The AD’s phrase "If not previously accomplished" recognises prior actions. Where the Part A inspection or equivalent action has already been completed, that may meet the duty; operators must hold evidence to demonstrate that prior completion was done in accordance with the referenced SB instructions or an acceptable equivalent.

In short, the AD imposes a targeted pair of duties , inspect, then conditionally replace , establishes a completion rule if the risk material is not present, authorises only specified SBs or Transport Canada-approved revisions for compliance, and fixes a compliance deadline. It is sparse on administrative rights, alternative compliance mechanisms or enforcement language within the instrument itself.

The AD text itself does not set out penalties, fines or a procedural enforcement regime. The directive specifies required technical actions, the compliance deadline ("Before 19 July 2011"), and its effective date (2 July 2009), and it bears the signature of a CASA delegate. Beyond those operational elements, the provided text contains no explicit enforcement provisions or penalty clauses.

What is present in the document that bears on enforcement

• Issuer identity: the AD is issued and signed by "James Coyne, Delegate of the Civil Aviation Safety Authority." The issuer’s identity indicates the administrative source of the directive, which is relevant because mandated airworthiness actions are typically enforced by the civil aviation regulator in its oversight of airworthiness and continuing airworthiness obligations.

• Mandatory language: the instrument uses imperative formulations ("inspect," "replace," "compliance ... is complete") rather than voluntary recommendations. That language establishes the AD as a prescriptive requirement rather than guidance.

• Effectiveness and timing: by fixing an effective date and a compliance deadline, the AD creates a temporal standard against which compliance may be assessed.

What the AD does not state

• The AD does not specify fines, licence consequences, rectification directions for non-compliance, or administrative sanctions within its text. The AD also does not outline the process for CASA to enforce compliance, nor does it identify permitted avenues for alternative methods of compliance within the AD itself.

Implications for enforcement practitioners and affected parties (grounded in the AD text)

• The directive’s prescriptive requirements and definite compliance date can be used by regulatory oversight staff to determine whether an affected aircraft has met the mandated inspection and replacement obligations; the AD itself supplies the technical criteria (Part A inspection; Part B replacement if Kapton is found).

• Because the AD references Bombardier SBs as the means of accomplishing the inspection and replacement, accepted completion will be demonstrated by records showing the SB Part A and Part B instructions were followed (or that an acceptable later SB revision was used, with the specified Transport Canada approval). The AD does not set a format for proof of compliance; operators should therefore preserve maintenance records that document completion in accordance with the named SBs and the dates those tasks were performed, to align with the AD's requirements.

• The AD identifies "Transport Canada AD CF-2009-18" as a related instrument and expressly allows later SB revisions only if "approved by the Chief, Continuing Airworthiness, Transport Canada." Any claim of compliance relying on an SB revision must therefore demonstrate that the revision had the stated Transport Canada approval.

Because the AD text itself is silent on penalties and the formal enforcement mechanism, parties needing clarity on enforcement consequences, enforcement procedures, or possible sanctions for non-compliance must consult the relevant civil aviation regulatory framework, or contact the issuing authority. The AD, as provided, supplies technical mandatory actions and timing, but not an enforcement schedule or penalty catalogue.

The AD explicitly cross-references manufacturer service material and a Transport Canada airworthiness directive, and it sets acceptance of later revisions conditional on a Transport Canada approval. Those cross-references are the principal points of interaction visible in the document.

Direct statutory/administrative interactions contained in the AD

• Service Bulletins: compliance is mandated "in accordance with the Accomplishment Instructions in Part A of Bombardier Service Bulletin (SB) 600-0737 or 601-0591 (as applicable), both dated 23 July 2007" and, where replacement is required, "in accordance with the Accomplishment Instructions in Part B" of the same SB(s). The AD thereby makes the Bombardier SBs the operative technical means for compliance; the AD does not purport to supersede those SBs but to require their execution for the subject aircraft.

• Transport Canada: the AD states that "Later revisions of the above SBs, approved by the Chief, Continuing Airworthiness, Transport Canada are acceptable for compliance with this Directive." It also notes that "Transport Canada AD CF-2009-18 refers." Those statements establish a specific cross-jurisdictional interaction: the CASA directive imports a Transport Canada approval gate for later SB revisions and points to a Transport Canada AD as related authority. The AD therefore creates a coordination point between CASA's directive and Transport Canada's continuing airworthiness decisions.

What the AD does not do

• The AD does not explicitly amend or repeal other ADs, regulations or statutory provisions. It is a stand-alone directive with stated applicability to enumerated serial numbers.

• The AD does not set out how it modifies operators' broader continuing airworthiness obligations such as maintenance scheduling, airworthiness certification, or operations approvals; it restricts itself to mandating the inspection/replacement sequence and to specifying acceptable SB versions.

Operational implications for overlapping regulatory obligations (grounded in the text)

• The AD’s reliance on SBs and Transport Canada approvals suggests operators must align their technical compliance with the manufacturer-prescribed steps and with the cross-recognised foreign authority's approvals for any SB revisions. Where there is an overlapping set of instructions from multiple authorities or manufacturers, the AD makes the Bombardier SBs the controlling technical documents for this requirement, subject to the stated Transport Canada approval.

• The AD’s express acceptance of later SB revisions only with Transport Canada approval means that operators cannot unilaterally rely on internal procedures or alternative technical solutions absent the permitted approval. Any alternative method of compliance would have to meet the condition the AD sets out (approval by Transport Canada’s named authority), because the AD itself does not provide for other alternative compliance mechanisms.

• The AD’s statement that "Transport Canada AD CF-2009-18 refers" integrates this CASA directive into a broader airworthiness action initiated by Transport Canada. That reference is material in that it aligns CASA’s measure with the foreign authority’s safety finding and prescribes the manufacturer’s remedy as the compliance method.

Documentation and audit trail

• Because the AD ties compliance to manufacturer SBs and to Transport Canada approvals, records demonstrating which SB revision was used and whether the Transport Canada approval existed for later revisions will form part of the compliance trail. The AD sets out the necessary technical instructions and the authority whose approval renders updated instructions acceptable.

In short, the AD creates a narrow but definite interaction with manufacturer service instructions and with Transport Canada’s continuing airworthiness decision-making; it does not purport to change other legal obligations but makes compliance contingent on the specific SBs and Transport Canada approvals named in the text.

The AD as provided contains limited amendment-related statements. The document itself was issued as AD/CL-600/108 (7/2009) and became effective on 2 July 2009, with a compliance deadline "Before 19 July 2011." The AD references Bombardier Service Bulletins SB 600-0737 and SB 601-0591, both dated 23 July 2007, as the technical documents governing the inspection and replacement procedures. The AD contains a single, narrowly framed amendment-relevant clause:

• "Later revisions of the above SBs, approved by the Chief, Continuing Airworthiness, Transport Canada are acceptable for compliance with this Directive."

That clause admits later SB revisions as acceptable means of compliance, but it conditions acceptance on approval by the named Transport Canada authority. The AD provides no further history of amendments, repeal, or superseding directives in the supplied text.

What the AD does not provide about amendment history

• There is no record within the AD text of any subsequent amendments to the AD itself, nor any documentation of supersessions, extensions of the compliance date, or revocations. The AD does not include an entry-table of amendments, nor does it include a "Variation" or "Supersession" note.

• The AD does not list any corrigenda, editorial corrections, or later instrument numbers associated with it in the supplied material.

Implications from the revision-acceptance clause

• The clause accepting later SB revisions, when approved by Transport Canada, functions operationally as a limited amendment gateway: it allows the technical method of compliance to change if the manufacturer issues updated SBs that receive the specified approval. That means, in practice, that while the AD's mandatory objective remains fixed (inspect and replace Kapton wiring as required), the specific procedural instructions used to accomplish that objective can be amended via an approved SB revision without changing the AD text itself.

• The AD’s effectiveness and compliance deadline remain tied to the directive itself unless a separate AD or regulatory action amends the directive’s dates or obligations; the AD contains no express amendment of its own compliance date.

Practical note

• For a practitioner reviewing an aircraft’s compliance status, the absence of amendment history in the AD text means one should verify whether CASA or the operator has issued subsequent ADs, or whether Transport Canada has issued approvals for later SB revisions. The AD’s acceptance of later SB revisions only with Transport Canada approval makes the approval record material to any audit of compliance.

In short, the AD contains one controlled mechanism for technical amendment (acceptance of later SB revisions with Transport Canada approval) but otherwise supplies no internal history of amendments in the provided text.

The provided AD text does not contain any litigation history. It does not reference any legal proceedings, appeals, determinations, or case law. There are no citations to decisions, no mention of disputes or challenges to the AD, and no record of judicial or administrative litigation contained in the document.

What is present in the document relevant to litigation or challenges

• The AD is expressed as a prescriptive, technical airworthiness requirement with an effective date (2 July 2009) and a compliance deadline (Before 19 July 2011). The text includes enforcement-like language (imperatives to inspect and replace), but it does not include an administrative review or appeal procedure in the AD itself.

• The AD points to Transport Canada AD CF-2009-18 as a reference. Where litigation arises in relation to this AD, parties would likely need to consider that related Transport Canada AD and any manufacturer SBs as part of the factual matrix, but the AD record supplied here does not include any contested enforcement actions.

Practical conclusion for litigators or counsel

• Because the AD text contains no litigation history, counsel examining compliance or enforcement risks must look beyond this instrument for any case law, enforcement notices, sanctions, or proceedings. The AD itself provides the substantive technical requirement and the compliance timeline, but it supplies no record of disputes or adjudications.

• Any argument about compliance, waiver, alternative means of compliance, administrative discretion, or proportionality would need to be grounded in the broader regulatory scheme, administrative decisions, or any subsequent correspondence with CASA or Transport Canada. Those materials are not part of the supplied AD, so they are not reflected here.

In short, the AD has no litigation history recorded in the provided document.

The AD may appear straightforward, but the text contains several practical traps and particulars that can affect compliance assessment, scheduling and resource planning. The following items are grounded in the AD language and its cross-references.

1. Narrow serial-number applicability

• The AD applies only to the specific serial number ranges listed for each model: CL-600-1A11 serials 1004-1085; CL-600-2A12 serials 3001-3066; CL-600-2B16 serials 5001-5131. Aircraft outside those specific serial numbers are not covered by this AD as written. Operators must confirm the exact serial number before treating the AD as applicable.

2. "If not previously accomplished" leaves evidence requirement

• The AD begins the duty with "If not previously accomplished, inspect ...". That means prior inspections or prior compliance might discharge the obligation, but the operator must hold documentary evidence showing the prior work was done in accordance with the referenced SB Part A instructions. Absent such documentary proof, the operator still bears the obligation to perform the inspection.

3. Binary outcome with different work scopes

• The inspection outcome determines whether replacement is required. If the wire type is not Kapton, the operator completes only Part A and is done. If Kapton is found, the operator must perform Part B replacement. Misidentifying wire type or misapplying the SB instructions will affect whether further work is required, so accurate inspection and recordation are vital.

4. Reliance on manufacturer SBs dated 23 July 2007

• The AD specifies SBs with that exact date. Where maintainers rely on later SB revisions, the AD unambiguously requires that such later revisions be approved by "the Chief, Continuing Airworthiness, Transport Canada." That approval is not optional; without it, using a later SB may not satisfy the AD. Confirmation of Transport Canada approval for any later SB revision used is therefore a necessary part of the compliance file.

5. Cross-jurisdictional approval gate

• The AD is issued by a CASA delegate but places acceptance of later SB revisions in the hands of Transport Canada. That cross-jurisdictional linkage may create practical delay: operators must verify whether Transport Canada has approved any updated SBs and obtain documentary proof of that approval.

6. Specific failure mode identified (connector P1XC)

• The AD’s background specifies that the Kapton wire chafed on the backshell of its own connector, identified as P1XC. Maintenance planners should check harness routing and the P1XC interface in their inspection scope. The technical specificity suggests a localised inspection focus; failing to inspect the P1XC backshell area may miss the defect mode the AD targets.

7. Time window between effective date and compliance date

• The AD becomes effective 2 July 2009 but allows completion before 19 July 2011. That is a fixed window; operators should not assume indefinite flexibility. Scheduling must ensure the inspection/replacement occurs before the named compliance date. The two-year window may have been intended to permit scheduled maintenance integration, but it may impose a scheduling crunch depending on aircraft utilisation.

8. The AD does not state paperwork format or retention

• The directive instructs operators to perform SB-based tasks but does not specify how evidence must be recorded. Standard airworthiness practice requires recordation, but the AD text does not state retention periods, format, or exactly where to file compliance evidence. Operators should preserve the manufacturer SB references, the inspection findings, the identity of the technician, serial numbers of replacement parts (if any), and the dates of work.

9. No explicit alternative means of compliance in the AD

• The AD allows later SB revisions approved by Transport Canada, but it does not state whether alternative technical solutions (for example, local repairs or protective routing) would be accepted. Any deviation from the SBs will likely require separate approval, and the AD text provides no mechanism for that approval within the instrument.

10. Transport Canada AD cross-reference

• The AD states "Transport Canada AD CF-2009-18 refers." Operators and maintainers must consult the Transport Canada AD to understand any complementary or explanatory material it might contain. The CASA AD alone does not convey the full context that Transport Canada’s AD may have supplied.

Each of these points is drawn from or implied by the AD text. They affect planning, documentation, parts procurement, approval tracking, and evidence for inspectors or auditors. Overlooking any of these particulars can lead to a mismatch between the performed work and compliance that the AD actually requires.

The AD prescribes a clear two-step compliance pathway tied to Bombardier Service Bulletin procedures, with a compliance deadline and permitted use of later SB revisions only with specified approval. Below is a practical, source-grounded checklist for compliance based solely on the AD text.

1. Confirm applicability

• Verify that the aircraft is one of the models and serial numbers listed: CL-600-1A11 (1004-1085), CL-600-2A12 (3001-3066), or CL-600-2B16 (5001-5131). If the aircraft is not within these serials, the AD is not applicable as written.

2. Check prior work and records

• Determine whether the Part A inspection has "previously accomplished." The AD starts with "If not previously accomplished, inspect ...". If prior inspection was done, ensure the maintenance records explicitly show the work conformed to the Accomplishment Instructions in Part A of Bombardier SB 600-0737 or SB 601-0591 dated 23 July 2007, or to a later SB revision that has approval from the Chief, Continuing Airworthiness, Transport Canada. Maintain documentary evidence (date, technician, SB revision, work order number).

3. Execute Part A inspection if required

• If the inspection has not been previously completed, perform the inspection "in accordance with the Accomplishment Instructions in Part A of Bombardier Service Bulletin (SB) 600-0737 or 601-0591 (as applicable), both dated 23 July 2007." Follow the detailed SB instructions on identifying the ADG power feeder harness wire type. Make an explicit record of the inspected wire type, the inspection method, the areas inspected (noting the AD’s background references to chafing on the backshell of connector P1XC), and the personnel who carried out the inspection.

4. Interpret inspection outcome

• If the wire type is not Kapton, the AD states: "complete the instruction in Part A of the applicable SB and compliance with Directive is complete." Record completion of Part A and retain the inspection report, with photographic evidence where possible, to demonstrate compliance.

• If the wire type is Kapton, proceed to step 5.

5. Execute Part B replacement if Kapton is found

• Where Kapton wire is present, "replace the ADG power feeder harness in accordance with the Accomplishment Instructions in Part B of SB 600-0737 or 601-0591 (as applicable)." Follow the Part B instructions exactly, procure parts specified by the SB, and document serial numbers of replacement harnesses or wires, technician certifications, dates of replacement, and any functional testing performed after replacement.

6. Use of later SB revisions (if applicable)

• If relying on a later revision of SB 600-0737 or SB 601-0591, ensure and document that the later revision has the explicit approval of the "Chief, Continuing Airworthiness, Transport Canada." The AD states: "Later revisions of the above SBs, approved by the Chief, Continuing Airworthiness, Transport Canada are acceptable for compliance with this Directive." Keep the approval documentation with the maintenance records to demonstrate that reliance on a later SB revision was authorised by the named authority.

7. Timing and deadlines

• Complete all required tasks (inspection and any replacement) before the compliance date: "Before 19 July 2011." The AD became effective on 2 July 2009; plan scheduling and parts procurement to meet the deadline.

8. Document and retain evidence

• Although the AD does not specify record-keeping particulars, maintain a comprehensive compliance file that includes:

  • Aircraft model and serial number confirmation.
  • Copy of the relevant Bombardier SB used (including revision date).
  • Where applicable, Transport Canada approval for any later SB revision.
  • Inspection records: who performed the inspection, the inspection method, findings (including photographs), date of inspection.
  • If replacement was required: parts used (part numbers and serial numbers if applicable), work order, technician sign-off, functional test results, date of completion.
  • Any correspondence with regulatory authorities about the AD.

9. Coordinate with parts suppliers and maintenance planners

• If replacement is likely, order the specified replacement harnesses/wiring early, and plan for aircraft downtime. The AD requires replacement "in accordance with Part B" of the SB; ensure parts match the SB specifications and that the maintenance provider is familiar with the SB Part B instructions.

10. Cross-reference Transport Canada AD CF-2009-18

• The AD notes that Transport Canada AD CF-2009-18 refers. Consult that Transport Canada AD for any additional context, instructions or clarifications that may support compliance. If there is language in the Transport Canada AD that affects the required actions, record how it was applied.

11. Maintain a compliance audit trail

• Because the AD asserts mandatory action for safety reasons, preserve records in a way that they can be produced to an inspector or auditor to demonstrate the AD was executed before the compliance deadline and in accordance with the specified SB or an approved later revision.

12. Verify aircraft return-to-service checks

• After replacement (if required), perform any functional checks prescribed by Part B of the SB to confirm the ADG supplies the essential bus as intended. Record results.

This compliance checklist is strictly grounded in the AD content: inspect per SB Part A; if Kapton wire present, replace per SB Part B; use later SB revisions only with the specified Transport Canada approval; meet the compliance deadline "Before 19 July 2011"; retain evidence of compliance. The AD supplies no alternative compliance mechanism or paperwork format, so operators must rely on standard airworthiness record practices and the documentation required by the SBs and the relevant aviation authority.