{"id":"F2009L03111","name":"AD/CL-600/116 - Air Driven Generator Strut","slug":"ad-cl-600-116-air-driven-generator-strut","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80825,"registerId":"commonwealth-F2009L03111-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Canadair) CL-600 (Challenger","sectionType":"division","heading":"Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","content":"### Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\n| AD/CL-600/116 | Air Driven Generator Strut | 9/2009 |\n| ------------- | -------------------------- | ------ |\n\n| Applicability: | Bombardier Inc. Models:CL-600-2B19, Serial Numbers (S/N) 7305 through 8051.CL-600-2C10, S/Ns 10003 through 10260.CL-600-2D15 and CL-600-2D24, S/Ns 15001 through 15106. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Identification Check:Check the Part Number (P/N) of the installed Air Driven Generator (ADG):a. If the ADG has Hamilton Sundstrand P/N 1711405, the strut wall thickness is within specification. No further action is required and compliance with this AD is complete.b. If the ADG has a Hamilton Sundstrand P/N in the 761339 series, check the ADG S/N and proceed as follows:i. If the S/N of the ADG is 2000 or higher, the strut wall thickness is within specification. No further action is required and compliance with this AD is complete.ii. If the S/N of the ADG is in the range 0101 through 1999 and symbol24-3 is marked in the S/N block of the identification plate, the strut wall thickness is within specification. No further action is required and compliance with this AD is complete.iii. If the S/N of the ADG is in the range 0101 through 1999 and symbol24-3 is not marked in the S/N block of the identification plate, check the S/N of the strut and generator housing assembly (for location, seeFigure 1, Sheet 1 of Hamilton Sundstrand Service Bulletin (SB) ERPS10AG-24-3) and proceed as follows:A. If the S/N of the strut and generator housing assembly is in the range 0001 through 2503, a fluorescent penetrant inspection is required. Proceed to Requirement 2 of this AD. |\n\n```html\n

B. If the S/N of the strut and generator housing assembly is 2504 or higher, the strut wall thickness is within specification. No further action is required and compliance with this AD is complete.

iv. If the S/N of the strut and generator housing assembly is not checked, fluorescent penetrant inspection is required. Proceed to Requirement 2 of this AD.

Note 1: Requirement 1 may be conducted visually, which requires the ADG to be lowered, or by checking the maintenance records.

2. Fluorescent Penetrant Inspection:

a. Applicable to CL-600-2B19 Aircraft, S/Ns 7305 through 8051:

Inspect the ADG strut, and replace the ADG as necessary, in accordance with the Accomplishment Instructions in Bombardier Alert Service Bulletin (ASB) A601R-24-120, Revision C, dated 20 April 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Prior accomplishment of the fluorescent penetrant inspection, conducted in accordance with either the above referenced SB or one of the SBs listed in Table 1 of this AD, also meets the intent of Requirement 2 of this AD.

Table 1

Bombardier Alert SB A601R-24-120

Original Issue

Dated 20 April 2005

Bombardier Alert SB A601R-24-120

Revision A

Dated 1 December 2005

Bombardier Alert SB A601R-24-120

Revision B

Dated 7 December 2006

Hamilton Sundstrand SB ERPS10AG-24-3

Original Issue

Dated 14 April 2005

Hamilton Sundstrand SB ERPS10AG-24-3

Revision 1

Dated 19 April 2005

Hamilton Sundstrand SB ERPS10AG-24-3

Revision 2

Dated 14 November 2006

Hamilton Sundstrand SB ERPS10AG-24-3

Revision 3

Dated 12 March 2009

\n```\n\n```html\n

Following completion of Requirement 2, no further action is required and compliance with this AD is complete.

Note 2: Requirement 2 is only applicable if required by Requirement 1.b.iii.A. and Requirement 1.b.iv of this AD.

Note 3: For ADGs specified in Requirement 1.b.iii.A repeat fluorescent penetrant inspections (per Hamilton Sundstrand SB ERPS10AG-24-3) are required as part of the periodic ADG Functional Check procedure. Refer to Airworthiness Requirements, Part 2 of Maintenance Requirements Manual, Appendix A - Certification Maintenance Requirements (CMR) and the Aircraft Maintenance Manual (AMM), as follows:

- CMR Task No. C24-20-129-01.

- AMM Task No: 24-23-01-720-803.

Note 4: For ADGs specified in Requirement 1.b.iii.A fluorescent penetrant inspection (per Hamilton Sundstrand SB ERPS10AG-24-3) is required following each future unscheduled in-flight ADG deployment, as specified in the following task:

- AMM Task No: 05-51-19-210-801.

Note 5: In Hamilton Sundstrand SB ERPS10AG-24-3, the fluorescent penetrant inspection is referred to as a “Penetrant Check”.

b. Applicable to CL-600-2C10 Aircraft, S/Ns 10003 through 10260, and
CL-600-2D15 and CL-600-2D24 Aircraft, S/Ns 15001 through 15106:

Inspect the ADG strut, and replace the ADG as necessary, in accordance with the Accomplishment Instructions in Bombardier Alert Service Bulletin (ASB) A670BA-24-020, Revision C, dated 20 April 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Prior accomplishment of the fluorescent penetrant inspection, conducted in accordance with either the above referenced SB or one of the SBs listed in Table 2, also meets the intent of Requirement 2 of this AD.

Table 2

Bombardier Alert SB A670BA-24-020

Original Issue

Dated 20 April 2005

Bombardier Alert SB A670BA-24-020

Revision A

Dated 17 May 2005

\n```\n\n```html\n

Bombardier Alert SB A670BA-24-020

Revision B

Dated 7 December 2006

Hamilton Sundstrand SB ERPS10AG-24-3

Original Issue

Dated 14 April 2005

Hamilton Sundstrand SB ERPS10AG-24-3

Revision 1

Dated 19 April 2005

Hamilton Sundstrand SB ERPS10AG-24-3

Revision 2

Dated 14 November 2006

Hamilton Sundstrand SB ERPS10AG-24-3

Revision 3

Dated 12 March 2009

Following completion of Requirement 2, no further action is required and compliance with this AD is complete.

Note 6: Requirement 2 is only applicable if required by Requirement 1.b.iii.A. and Requirement 1.b.iv of this AD.

Note 7: For ADGs specified in Requirement 1.b.iii.A repeat fluorescent penetrant inspections (per Hamilton Sundstrand SB ERPS10AG-24-3) are required as part of the periodic ADG Functional Check procedure. Refer to Airworthiness Requirements, Part 2 of Maintenance Requirements Manual, Appendix A - Certification Maintenance Requirements (CMR) and the Aircraft Maintenance Manual (AMM), as follows:

- CMR Task No. 24-23-00-102.

- AMM Task No: 24-23-01-720-802.

Note 8: For ADGs specified in Requirement 1.b.iii.A fluorescent penetrant inspection (per Hamilton Sundstrand SB ERPS10AG-24-3) is required following each future unscheduled in-flight ADG deployment, as specified in the following task:

- AMM Task No: 05-51-19-210-801.

Note 9: In Hamilton Sundstrand SB ERPS10AG-24-3, the fluorescent penetrant inspection is referred to as a “Penetrant Check”.

Note 10: Transport Canada AD CF-2009-27 dated 8 June 2009 refers.

Compliance:

For Requirements 1 and 2 - Within 1,000 flight hours or before the next scheduled ADG functional check, whichever comes first, after the effective date of this AD.

\n```\n\n| | This Airworthiness Directive becomes effective on 27 August 2009. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Background: | Two cases of a crack on a \"dry\" ADG (Hamilton Sundstrand part number in the 761339 series), in the aft area of the strut and generator housing assembly, have been reported on CL-600-2B19 aircraft. The same part is also installed on CL-600-2C10,-2D15 and -2D24 aircraft. Investigation determined that the crack was in an area of the strut where the wall thickness of the casting was below specification, due to a manufacturing anomaly in a specific batch of ADGs. Structural failure and departure of the ADG during deployment could possibly result in damage to the aircraft structure. If deployment was activated by a dual engine shutdown, ADG structural failure would also result in loss of hydraulics for the flight controls. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n15 July 2009","sortOrder":0},{"sectionNumber":"AD/CL-600/116","sectionType":"part","heading":"AD/CL-600/116","content":"## AD/CL-600/116","sortOrder":1},{"sectionNumber":"Air Driven Generator Strut","sectionType":"part","heading":"Air Driven Generator Strut","content":"## Air Driven Generator Strut","sortOrder":2},{"sectionNumber":"9/2009","sectionType":"part","heading":"9/2009","content":"## 9/2009","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD is narrowly targeted to ADGs with Hamilton Sundstrand P/Ns in the 761339 series and specified serial-number ranges installed on listed CL-600 variants to address a manufacturing anomaly (Background; Applicability). It does not broaden obligations to other parts, models or unrelated batches; required inspections, replacements and periodic/post-deployment checks align with correcting the identified below-spec strut wall thickness."},"complexity_factors":["Applicability narrows to multiple CL-600 model variants and specific serial-number blocks (Applicability).","Multi-branch identification logic depending on ADG part number, ADG serial number, presence of symbol '24-3' on the identification plate, and the strut-and-generator-housing assembly serial number (Requirement 1.b.i–iv).","Conditional trigger for fluorescent penetrant inspection only for certain serial ranges or when serials are not checked; otherwise no further action (Requirement 1.b.iii–iv; Requirement 2).","Inspection and replacement actions must follow specific Bombardier and Hamilton Sundstrand Service Bulletins, including multiple revisions listed in Tables 1 and 2 (Requirement 2; Table 1/2).","Cross-references to Airworthiness Requirements, Maintenance Requirements Manual (CMR) and Aircraft Maintenance Manual tasks, creating ongoing periodic and post‑deployment inspection obligations (Notes 2–9).","Compliance timing constraint: within 1,000 flight hours or before the next scheduled ADG functional check (Compliance).","Operational choices: identification may be by physical lowering of the ADG or by checking maintenance records (Note 1), introducing tradeoffs between maintenance downtime and administrative checks.","Regulatory discretion: acceptance of 'later revisions approved by the Chief, Continuing Airworthiness, Transport Canada' creates an approval gate for service bulletin updates (Requirement 2).","Multiple overlapping documents and revisions to track (several SBs and revisions listed), increasing administrative and technical compliance burden."],"plain_english_summary":"This directive requires operators of specified Bombardier CL-600 Challenger aircraft to check the Air Driven Generator (ADG) part and serial numbers and, for affected units, perform a fluorescent penetrant inspection and replace the ADG if necessary. Compliance is due within 1,000 flight hours or before the next scheduled ADG functional check. It targets ADGs from a specific manufacturing batch with below-spec strut wall thickness and mandates repeat checks as part of periodic maintenance and after any unscheduled in‑flight ADG deployment."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This AD maintains its original scope focused on the specific safety issue of ADG strut wall thickness in identified serial number ranges. The document includes standard cross-references to related maintenance procedures and alternative service bulletins, which is typical for aviation safety directives and does not represent scope creep beyond the original safety purpose."},"complexity_factors":["Nested conditional logic with 4 levels of decision branching (Requirement 1.a → 1.b → 1.b.iii → 1.b.iii.A/B)","Multiple overlapping serial number ranges that determine compliance paths (0101-1999 vs 2000+, 0001-2503 vs 2504+)","Cross-referencing to 7 different service bulletin versions across 2 manufacturers (Bombardier and Hamilton Sundstrand)","Dual applicability matrices (Table 1 and Table 2) with different SB references for different aircraft models","Conditional applicability of Requirement 2 based on outcomes of Requirement 1 (Notes 2 and 6 explicitly state this dependency)","Integration with ongoing maintenance requirements (Notes 3, 4, 7, 8 reference separate CMR and AMM task numbers for repeat inspections)","Specific manufacturing marking requirement ('symbol24-3') as a determinative factor","Alternative compliance methods (visual inspection vs maintenance records review) with different physical access requirements"],"plain_english_summary":"Owners/operators of specified Bombardier Challenger CL-600 series aircraft must inspect certain Air Driven Generators (ADGs) for thin-walled struts that can crack and fail. Affected units are identified by part/serial numbers and a manufacturing mark; at-risk ADGs require a fluorescent penetrant inspection and replacement if cracked.\n\nThis mandatory AD matters because ADG failure on deployment could sever hydraulic and electrical backup during a dual-engine loss. Comply within 1,000 flight hours or by the next ADG functional check."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-116-air-driven-generator-strut","history":"/api/acts/ad-cl-600-116-air-driven-generator-strut/history","analysis":"/api/acts/ad-cl-600-116-air-driven-generator-strut/analysis","conflicts":"/api/acts/ad-cl-600-116-air-driven-generator-strut/conflicts","importantCases":"/api/acts/ad-cl-600-116-air-driven-generator-strut/important-cases","documents":"/api/acts/ad-cl-600-116-air-driven-generator-strut/documents"}}