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CF-2009·27

TP 7245E

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AIRWORTHINESS

Issue Dale

08 June 2009

DIRECTIVE

Number:

Subject:

Effective:

Applicability:

Compliance:

Background:

Corrective

Actions:

CF-2009-27

Air Driven Generator (ADG) - Strut Cracking

29 June 2009

Bombardier Inc. Models:

CL,600-2B19, Serial Numbers 7305 through 8051.

CL-600-2C10, Serial Numbers 10003 through 10260.

CL-500-2D15 and CL-600-2D24. Serial Numbers 15001 through 15106.

As indicated below, unless already accomplished.

Two cases of a crack on a ~dry" ADG (Hamilton Sundslrand part number in the 761339 series), in

the aft area of the strut and generator housing assembly, have been reported on CL-600-2819

aircraft. The same part is also installed on CL-6OQ-2C10. -2015 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 resuit 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.

This directive gives instructions to check the part number of the installed ADG and, for ADGs with

a part number in the 761339 series, the serial numbers of the ADG and strut and generator

housing assembly are also to be checked_ If these serial numbers are within specified ranges [see

Part I, paragraph R(3).(a) below], a one-time fluorescent penetrant inspection of the ADG strut is

required.

Note: For ADGs with serial numbers in the above-referenced specified ranges, subsequent

fluorescent penetrant inspections are required after each scheduled in-night or on-ground

functional check of the ADG and also after each unscheduled in-flight ADG deployment.

These inspection requirements are not mandated in this directive but are specified in the

approved maintenance program,

Part I - Identification Check

Within 1000 hours air lime or before the next scheduled ADG funclional check. whichever comes

first, after the effective date of Ihis directive:

Check the part number of the installed ADG:

A. If the ADG has Hamilton Sundstrand part number 1711405, the strut wall thickness is within

specification. No further action is required and compliance with this directive is compiete_

B_ If the ADG has a Hamilton Sundstrand part number in the 761339 series, check the ADG serial

number and proceed as foliows:

1) If the serial number of the ADG is 2000 or higher, the strut wall thickness is within

specification, No further action is required and compliance with this directive is complete_

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No. CF·2009-27

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2) If the serial number of the ADG is in the range 0101 through 1999 and symbol 24-3 is

marked in the Serial Number block of the identification plale, the strut walilhickness is

within specification. No further action is required and compliance with this directive is

complete.

3) If the serial number of the ADG is in the range 0101 through 1999 and symbol 24-3 is not

marked in the Serial Number block of the identification plate, check the serial number of

the strut and generator housing assembly (for location, see Figure 1, Sheet 1 of Hamilton

Sundstrand Service Bulletin (58) ERP510AG-24-3) and proceed as follows:

(a) If the serial number of the strut and generator housing assembly is in the range 0001

through 2503, a fluorescent penetrant inspection is required_ Proceed to Part II of this

directive.

(b) If the serial number of the strut and generator housing assembly is 2504 or higher, the

strut wall thickness is within specification. No further actlon is required and

compliance with this directive is complete. I

4) If the serial number of the strut and generator housing assembly is not checked,

fluorescent penetrant inspection is required. Proceed to Part II of this directive

NOle: Part I may be conducted visually, which requires the ADG to be lowered, or by checking

the maintenance records.

Part It - Fluorescent Penetrant Inspection

A. Applicable to CL-600-2B19 Aircraft, Serial Numbers 7305 through 8051:

Within 1000 hours air time or before the next scheduled ADG functional check, whichever

comes first. after the effective date of this directive:

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 S8 or one of the following SBs, also meets the intent of Part II 01

this directive:

Bombardier Alert SB Original issue Dated 20 April 2005

A601 R·24·120

Bombardier Alert SB Revision A Dated 1 December 2005

A601 R-24·120

Bombardier Alert SB Revision 8 Dated 7 December 2006

A601R·24·120

Hamilton Sundslrand 58 Original issue Dated 14 April 2005

ERPS10AG-24-3

Hamilton Sundslrand 58 Revision 1 Dated 19 April 2005

ERPS10AG·24-3

Hamilton Sundstrand 58 Revision 2 Dated 14 November 2006

ERPS10AG·24-3

Hamilton Sundstrand SB Revision 3 Dated 12 March 2009

ERPS10AG-24-3

Following completion of Part II, no further action is required and compliance with this directive

is complete.

Notes: 1. Part II is only applicable If required by Part I, Paragraph B.(3).(a}, or by Part I,

Paragraph 8.(4) of this directive.

2. For ADGs specified in Part I, Paragraph 8.(3).(a), repeat lIuorescent penetrant

inspections (per Hamilton Sundstrand S8 ERPS 1OAG-24-3) are required as part of

the periodic AOG Functional Check procedure. Refer to Airworthiness Requirements,

Part 2 of Maintenance Requirements Manual, Appendix A - Certification

Maintenance Requirements (CMR) and the Aircraft Maintenance
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No. CF·2009·27

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Manual (AMM), as follows:

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

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

3. For ADGs specified in Part I, Paragraph B.(3}.(a), fluorescenl penetrant inspectionj

(per Hamilton Sundslrand 58 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.

4, In Hamilton Sundslrand 58 ERPS10AG-24-3, the fluorescent penetrant inspection is

referred 10 as a ~Penetrant Check",

B. Applicable to CL-60Q.-2Cl0 Aircraft, Serial Numbers 10003lhrough 10260, and CL-600-2D15

and Cl-600-2D24 Aircraft, Serial Numbers 15001 through 15106:

Within 1000 hours air time or before the next scheduled ADG functional check, whidlever comes

first, after the effeclive dale of this directive:

Inspect the ADG strut, and replace the AOG as necessary. in accordance with the

Accomplishment Instructions in Bombardier ASS A670SA-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 S8 or one of the following SSs, also meets the intent of Part II of this

directive:

Bombardier Alert 5B Original issue IDated 20 April 2005

A670BA-24-o20

Bombardier Alert SB Revision A Dated 17 May 2005

A670BA-24.(J20

Bombardier Alert SB Revision B Dated 7 December 2006

A670BA-24-o20

Hamilton Sundstrand Original issue Dated 14 April 2005

58 ERPS10AG·24·3

Hamilton Sundstrand Revision 1 Dated 19 April 2005

58 ERPS10AG·24-3

Hamilton Sundstrand Revision 2 Dated 14 November 2006

58 ERPS10AG·24-3

Hamilton Sundstrand Revision 3 Dated 12 March 2009

S6 ERPS10AG·24·3

Following completion of Part II, no further action is required and compliance with this directive is

complete.

Notes:

1. Part II is only applicable if required by Part I, Paragraph 8.(3).(a), and Part I,

Paragraph 8.(4) of this directive.

2_ For ADGs specified in Part J, Paragraph 8.(3)_(a), repeat fluorescent penetrant

inspections (per Hamilton Sundstrand 58 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.

3. For ADGs specified in Part I, Paragraph 8.(3).(a), fluorescent penetrant

inspection (per Hamilton Sundslrand SB ERPS10AG-24-3) is required

following each future unscheduled in-flight ADG deployment, as specified in
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No. CF·2009·27

,.

the following task:

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

Authorization:

4. In Hamilton Sundstrand S8 ERPStOAG-24-3, the fluorescent penetrant inspection is

referred to as a "Penetrant Check".

For Minister of Transport, Infrastructure and Communities

Derek Ferguson

Acting Chief, Continuing Airworthiness

Contact: Mr. Richard Topham, Continuing Airworthiness, Ottawa, telephone 613-952-4428,

613-996-9178 or e-mail richard.lopham@tc.gc.caoranyTransport Canada Centre.

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