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# AIRWORTHINESS DIRECTIVE

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your na me. ADs are issued pursuant to Canadian Aviation Regulation (CAR) 521 Division X . Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H , the continuing airworthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD ma y invalidate the flight authorization of the aircraft. Alternative means of compliance shall be applied for in accordance with CAR 605.84 and the above-referenced Standard

. This AD has been issued by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Can ada, Ottawa, telephone 613 952-4357.

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall, within seven days, notify the Minister in writing of any change of his or her name or address.

To request a change of address, contact the Civil Aviation Communica tions Centre (AARC)

at Place de Ville, Ottawa, Ontario K1A 0N8 , or 1-800-305-2059

, or www.tc.gc.ca/civilaviation/communications/centre/ address.asp

24-0022 (01-2005) 1/3 No

. CF-2009-48

Issue Date 14 December 2009

In Number: CF-2009-48

Subject: Air-Driven Generator (ADG) – Non-Conforming Balance Washer Screws

Effective: 25 January 2010

Applicability: Bombardier Inc. Models:

CL-600-2B19, Serial Numbers (S/Ns) 7305 through 7990 and 8000 and subsequent. CL-600-2C10, S/Ns 10003 and subsequent. CL-600-2D15 and CL-600-2D24, S/Ns 15001 and subsequent.

Compliance: As indicated below, unless already accomplished.

Background: Following five reported cases of balance washer screw failure on similar ADGs/ram air turbines installed on other aircraft ty pes, investigation by Hamilton Sundstrand determined that a specific bat ch of the screws had a metall ographic non-conformity that increased their susceptibility to brittle frac ture. Subsequently, it was established that 152 “dry” ADGs [Hamilton Sundstrand Part Nu mbers (P/Ns) in the 761339 series and 1711405; see Note] either had non-conforming screws installed during production or may possibly have had non-conforming screws in stalled during maintenance or repair at Hamilton Sundstrand repair stations.

Failure of a balance washer screw can result in loss of the related balance washer, with consequent turbine imbalance. Such imbalance c ould potentially result in ADG structural failure (including blade failure), loss of AD G electrical power and structural damage to the aircraft and, if deployment was activa ted by a dual engine shutdown, could also result in loss of hydraulic power for the flight controls.

This directive mandates checking the ADG and replacing the balance washer screws, if required. It also prohibits future installation of unmodified ADGs.

Note: ADGs with Hamilton Sundstrand P/Ns in the 761339 series and 1711405 are

installed on the aircraft models listed in the Applicability section above in addition to Bombardier Inc. Model CL-600-2B16. The latter model is covered in a separate

directive.

Corrective

Actions: Part I - Identification Check

Applicable to: CL-600-2B19 aircraft, S/Ns 7305 through 7990 and 8000 through 8105, CL-600-2C10 aircraft, S/Ns 10003 through 10297, and CL-600-2D15 and CL-600-2D24 aircraft, S/Ns 15001 through 15248.

Prior to the next in-flight or on-ground functi onal/operational check of the ADG, after the effective date of this directive, c heck the S/N of the installed ADG:No.

N ° CF-2009-48 2/3

A. If the ADG S/N is not listed in par agraph 1.A. of the applicable Bombardier Aerospace Service Bulletin (SB) detailed below, or later revision approved by the Chief, Continuing Airworthiness, Transpor t Canada, no further action is required and compliance with this directive is complete.

Service Bulletin Issue Date

601R-24-127 Original 23 October 2009

670BA-24-026 Original 23 October 2009

B. If the ADG S/N is listed in paragraph 1.A. of the applicable Bombardier Aerospace SB detailed below, or later revision approved by the Chief, Continuing Airworthiness, Transport Canada, ins pect the ADG identification plate.

Service Bulletin Issue Date

601R-24-127 Original 23 October 2009

670BA-24-026 Original 23 October 2009

1) If symbol “24-5” is marked on the ADG identification plate, the balance washer screws have already been replaced. No further action is required and compliance with this directive is complete.

2) If symbol “24-5” is not marked on the ADG identification plate, replacement of the balance washer screws is required. Proceed to Part II of this directive.

Note: Part I of this directive may be c onducted visually, which requires the ADG to be lowered, or by checking the delivery and maintenance records.

Part II: Replacement of the Balance Washer Screws and Identification of the ADG

Applicable to: CL-600-2B19 aircraft, S/Ns 7305 through 7990 and 8000 through 8105, CL-600-2C10 aircraft, S/Ns 10003 through 10297, and CL-600-2D15 and CL-600-2D24 aircraft, S/Ns 15001 through 15248.

Prior to the next in-flight or on-ground functi onal/operational check of the ADG, after the

effective date of this directive:

Replace all of the balance washer screws, and mark the ADG identification plate with symbol “24-5”, in accordance with the Accomplishment Instructions in the applicable Bombardier Aerospace SB detailed below, or later revision approved by the Chief, Continuing Airworthiness, Transport Canada.

Service Bulletin Issue Date

601R-24-127 Original 23 October 2009

670BA-24-026 Original 23 October 2009

Note: Part II is only applicable if required by Part I, Paragraph B.2. of this directive.

Part III: Replacement Parts

Applicable to: CL-600-2B19 aircraft, S/Ns 7305 through 7990 and 8000 and subsequent, CL-600-2C10 aircraft, S/Ns 10003 and subsequent, and

CL-600-2D15 and CL-600-2D24 ai rcraft, S/Ns 15001 and subsequent.No.

N ° CF-2009-48 3/3

After the effective date of this directive:

It is not permitted to install a replacem ent/spare ADG [Hamilton Sundstrand P/N in the 761339 series or 1711405] that has one of t he S/Ns listed in paragraph 1.A of the applicable Bombardier Aerospace SB detailed below, or later revision approved by the Chief, Continuing Airworthiness, Transport Canada, unless it is identified with the symbol “24-5” on the identification plate.

Service Bulletin Issue Date

601R-24-127 Original 23 October 2009

670BA-24-026 Original 23 October 2009

Authorization: For Minister of Transport, In frastructure and Communities



### ORIGINAL SIGNED BY

Derek Ferguson, Chief, Continuing Airworthiness

Contact: Mr. Richard Topham, Continuing Airworthiness, Ottawa, telephone 613-952-4357,

facsimile 613-996-9178 or e-mail CAW Web Feedback@tc.gc.ca or any Transport

Canada Centre.