# 1+1 Transport Canada Transports

Canada No. TP 7245E 

# I 1/2 

# AIRWORTHINESS Issue Dale 

### 17December 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<>nlinuonqSI<W<ll1hlness01 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 rnaccordance wilh CAR GOS.S4and the aDilvB·referanood St'ndard, Thi, AD ha. been Issued byth'~CO"linulng IIlr,vMhine>s [);,,;,ioo {A!\RD8), Nalional Aircrall Certlfic.atlon aranch, Transpon Ganada, Ottawa. telep~one 6' 3952.4357. 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 specifiCbatch ofthe screws had ametallographic 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 repairstations 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 ofADG electrical power and structural damage to the aircraft and, if deployment was activated bya dual engine shutdown, could also result in loss of hydraulic power forthe flight controls. This directive mandates checking of the ADG and replacing the balance washer screws, if required. Italso prohibits future installation of unmodified ADGs. Note: ADGs with Hamilton Sundstrand PINs inthe 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 aseparate directive. Part I-Identification Check Applicable to CL-600-2B16 aircraft, SINs 5408through 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, checkthe SIN ofthe 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 iscomplete.

B. If the ADG SIN is listed in paragraph 1,A. of the applicable Bombardier Aerospace S6 detailed below, or later revision approved bythe Chief, Continuing Airworthiness, Transport Canada, inspect theADG identification plate.

Pursuant !OCAR 202,S' Ihe.reglMered OWll'" 01a Canadian a;n;raft ,hall, wilhin •••""n days, nolify 1M Minister inwriting 01any change 01his·o' her name or "jdreSS. 

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# Canada

# INo. 

### CF-2009·50 N'

Authorization:

Contact: 1) Ifsymbol "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 iscomplete. 2) If symbol "24_5" is not marked on the ADG identification plate. replacement of the balance washer screws isrequired. Proceedto Part IIofthis directive. Note: Part I ofthis directive may be conducted visually, 'Nhich requires the ADG to be lowered, orbychecking the delivery and maintenance records. Part II: Replacement of the Balance Washer Screws and Identification of the ADG Applicabie to CL..oOO-2B16aircraft, SINs 5408through 5665 and 5701 through 5802 Priortothe nextscheduled in-flight operational testoftheADG after theeffective date ofthis 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 bythe Chief, Continuing Airworthiness, Transport Canada.

Note: Part II isonlyapplicable ifrequired byPart I, Paragraph 8.2. ofthis directive.
Part III: Replacement Parts Applicable to CL-600-2B 16aircraft, SINs 5408through 5665and 5701 and subsequent After theeffective date ofthisdirective: 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 bythe Chief, Continuing Airworthiness, Transport Canada. unless itis identified with thesymbol "24-5" onthe identification plate.

ForMinister ofTransport, 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 ore-mail CAW WEB Feedback@tc.gc.ca oranyTransport Canada Centre.