1+1 Transport

Canada

Transports

Canada No.

TP 7245E

I 1/2

AIRWORTHINESS

Issue Dale

17 December 2009

DIRECTIVE

The Following "I"""tlniness di",c~vo (AD! may be .prkab,e to on aircraft which our reCGn:ls Indic:.le i, registered in your oamo. AO •• 'e '''u~d pursuanl 10 C"rmdian

Aviation Regularlon (CAR) 511 Oivislon X, Pu,""an to CAR 605,84 'nd tho further detail. of CAR Standard 626, AIP.n~ix.ll,the c<>nlinuonq SI<W<ll1hlness 01 d CaMdian

regj'tered 31"""il is <xmUngenl upon complia",. with all applicable AOs. Failure 10comply with Ih~ ",qulremenlS of an D m~y ,nvalidale lhe flight 'ulhon7."rton of the .'r:crafl,

Alte,native "'''''"' ot compliance .noll !l<!"pplled lor rn accordance wilh CAR GOS.S4 and the aDilvB·referanood St'ndard,

Thi, AD ha. been Issued by th'~ CO"linulng IIlr,vMhine>s [);,,;,ioo {A!\RD8), Nalional Aircrall Certlfic.atlon aranch, Transpon Ganada, Ottawa. telep~one 6' 3 952.4357.

In Number:

Subject:

Effective:

Applicability:

Compliance:

Background:

Corrective

Actions:

CF-2009-50

Air-Driven Generator (ADG) - Non-Confonnlng Balance Washer Screws

25 January 2010

Bombardier Inc. Model CL-600-2B16, Serial Numbers (SINs) 5408 through 5665 and 5701 and

subsequent

As indicated below.

Following five reported cases of ADG balance washer screw failure on similar ADGs/ram air

turbines installed on other aircraft types, investigation by Hamilton Sundstrand determined that a

specifiC batch of the screws had a metallographic non-conformity that increased their susceptibility

to brittle fracture. Subsequently. it was established that 152 "dry" ADGs [Hamilton Sundstrand

Part Numbers (PINs) in the 761339 series and 1711405; see Note] either had non-conforming

screws installed during production or possibly during maintenance or repair at Hamilton

Sundstrahd repair stations

Failure of a balance washer screw can result in loss of the related balance washer. wFlh

consequent turbine imbalance, Such imbalance could potentially result in ADG structural failure

(including blade failure), loss of ADG electrical power and structural damage to the aircraft and, if

deployment was activated by a dual engine shutdown, could also result in loss of hydraulic power

for the flight controls.

This directive mandates checking of the ADG and replacing the balance washer screws, if

required. It also prohibits future installation of unmodified ADGs.

Note: ADGs with Hamilton Sundstrand PINs in the 761339 series and 1711405 are installed on

the ai'rcraft model listed in the Applicability section above in addition to Bombardier Inc.

Models CL-600-2619, CL-600~2C10 and CL-600-2D24. The latter three models are

covered in a separate directive.

Part I -Identification Check

Applicable to CL-600-2B16 aircraft, SINs 5408 through 5665 and 5701 through 5802

Prior to the next scheduled in·fIight operational test of the ADG after the effective date of this

directive, unless already accomplished, check the SIN of the installed ADG:

A. If the ADG SIN is not listed in paragraph 1.A. of the applicable Bombardier Aerospace

Service Bulletin (S6) detailed below, or later revision approved by the Chief, Continuing

Airworthiness, Transport Canada, no further action is required and compliance with this

directive is complete.

B. If the ADG SIN is listed in paragraph 1,A. of the applicable Bombardier Aerospace S6

detailed below, or later revision approved by the Chief, Continuing Airworthiness, Transport

Canada, inspect the ADG identification plate.

Pursuant !O CAR 202,S' Ihe.reglMered OWll'" 01 a Canadian a;n;raft ,hall, wilhin ••• ""n days, nolify 1M Minister

in writing 01 any change 01 his·o' her name or "jdreSS.

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I

No. CF-2009·50

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Authorization:

Contact:

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 conducted visually, 'Nhich 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

Applicabie to CL..oOO-2B16aircraft, SINs 5408 through 5665 and 5701 through 5802

Prior to the next scheduled in-flight operational test of the ADG after the effective date of this

directive, unless already accomplished:

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.

Note: Part II is only applicable if required by Part I, Paragraph 8.2. of this directive.

Part III: Replacement Parts

Applicable to CL-600-2B 16 aircraft, SINs 5408 through 5665 and 5701 and subsequent

After the effective date of this directive:

It is not permitted to install a replacement/spare ADG [Hamilton Sundstrand PIN in the 761339

series or 1711405) with one of the SINs listed in paragraph 1.A of the applicable Bombardier

Aerospace S8 detailed below, or iater revision approved by the Chief, Continuing Airworthiness,

Transport Canada. unless it is identified with the symbol "24-5" on the identification plate.

For Minister of Transport, Infrastructure and Communities

ORIGINAL SIGNED BY

Derek Ferguson,

Chief, Continuing Airworthiness

Mr. Richard Topham. Continuing Airworthiness, Ottawa, telephone 513-9'52-4357, facsimile

613-996-9178 or e-mail CAW WEB Feedback@tc.gc.ca or any Transport Canada Centre.