### Transport Transports Canada Canada TP 7245E



# 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 may 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 b y the Continuin g Airworthiness Division ( AARDG ) , National Aircraft Certification Branch, T r ans p ort Canada, Ottawa, tele p hone 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 Communicat ions 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
2 4-0022 ( 01-2005 ) 

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### CF-2011-08 Issue Date 

### 28 April 2011

Number: CF- 2011-08 Subject: Air-Driven Generator Electrical Power Feeder Cable – Potential Failure Due To Corrosion
Effective: 19 May 2011 Applicability: Bombardier Inc. Model CL-600-2B16 aeroplanes, Se rial Numbers 5301, 5302, 5305 through 5318, 5320 through 5328, 5331 through 5349, 5351 through 5367, 5369 through 5408, 5410, 5412 through 5426, 5428 through 5438, 5440 th rough 5489, 5491 through 5498, 5500 through 5517, 5519 through 5522, 5524 through 5665. Compliance: As indicated, unless already accomplished. Background: Three (3) events have occurred where the Air-Driv en Generator (ADG) fail ed to provide power on CL-600-2B19 (CRJ) aeroplanes duri ng their regularly scheduled operat ional/functional checks. An investigation revealed that in a ll cases, the silver-plated copper wires within the ADG power feeder cables were damaged due to galvanic corrosion. It was subsequently determined that the silverplating is inadequate for this application. In the event of damage to the power feeder cable wires, the ADG may not be able to provide emergency electrical power to the aeroplane. Although there have been no repor ted failures to date on any CL-600-2B16 (604 Variant) aeroplanes, a sampling program carried out on t hese aeroplanes showed signs of microscopic galvanic corrosion on the ADG power feeder cable wires. This directive is issued to correct this potentia lly unsafe condition by mandat ing the replacement of all ADG power feeder cables that contain silver-plated copper wi res, with an ADG power feeder cable that contains ti n-plated copper wires.
Corrective Actions: Within 72 months from the effect ive date of this directive, repl ace the ADG power feeder cable in accordance with the accomplishment instructions in section 2 of the Bombardier Service Bulletin 604-24-024, dated 31 January 2011, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.

Authorization: For the Minister of Transport, Infrastructure and Communities 

### ORIGINAL SIGNED BY Derek Ferguson Chief, Continuing Airworthiness
Contact: Mr. Robert Farinas, Continuing Airworthi ness, Ottawa, telephone 613-952-4357, facsimile 613-996-9178 or e-mail CAWWEBFeedback@tc.gc.ca or any Transport Canada Centre.