### 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, Trans 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 ) 

### 1/1 No

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### CF-2011-30 Issue Date 

### 11 August 2011

Number: CF- 2011-30 Subject: Cracking on the Forward Face of the Rear Pressure Bulkhead Web
Effective: 24 August 2011 Replacement: Supersedes Airworthiness Directive CF-2005-13R1. Applicability: Bombardier Inc. Aeroplane Model CL-600-2B19, serial numbers 7003 and subsequent. Compliance: As indicated below, unless already accomplished. Background: Cracks on the forward face of the Rear Pressure Bulkhead (RPB) web have been discovered on three CL-600-2B19 aeroplanes in-service. This indicates that the existing inspection requirements of Airworthiness Limitation (AWL) task 53-61-153 mandated by AD CF-2005-13R1 are not adequate. Failure of the RPB could result in rapid decompression of the aeroplane. A Temporary Revision has been made to Part 2 of the Maintenance Requirements Manual (MRM) to revise the existing AWL task by introducing an improved Non-Destructive Inspection (NDI) procedure to ensure that fatigue cracking of the RPB is detected and corrected. This directive mandates the incorporation of a new NDI procedure for AWL task number 53-61-153. Corrective Actions: A. Within 60 days after the effective date of this directive, amend the Transport Canada approved maintenance schedule by incorporating the revised inspection requirements of AWL task number 53-61-153, as introduced by TR 2B-2187, dated 22 June 2011, into Part 2 of the Canadair Regional Jet Maintenance Requirements Manual (MRM).
B. Compliance with the above-mentioned task should be carried out in accordance with the following phase-in schedule. As of the effective date of this directive :
1. For aeroplanes that have accumulated 10 500 total flight cycles or less: prior to accumulating 12 000 total flight cycles;
2. For aeroplanes that have accumulated more than 10 500 total flight cycles: within 1500 flight cycles after the effective date of this directive, or at the next scheduled inspection interval for task number 53-61-153, whichever comes first. Compliance in accordance with superseding Temporary Revisions or later revisions of the Airworthiness Limitations of the MRM, approved by Transport Canada, also satisfies the requirements of this directive.
Authorization: For the Minister of Transport, Infrastructure and Communities


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