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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 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/ addr ess.asp

24-0022 (01-2005) 1/2 No

. CF-2009-49R1

Issue Date 21 January 2010

Number: CF-2009-49R1

Subject: Wing Leading Edge Thermal Switches a nd Wing Anti-Ice Duct Piccolo Tubes –

Airworthiness Limitation Tasks

Effective: 25 January 2010

Revision: Supersedes Airworthiness Directive (AD) CF-2009-49 issued 17 December 2009.

Applicability: Bombardier Inc. Models:

CL-600-2A12 - Serial Numbers 3001 through 3066 [Post Service Bulletin 601-0590 only] CL-600-2B16 - Serial Numbers 5001 through 5194 [Post Service Bulletin 601-0590 only] CL-600-2B16 - Serial Numbers 5301 through 5665 CL-600-2B16 - Serial Numbers 5701 and subsequent

Compliance: As indicated below, unless already accomplished.

Background: During flight-testing of a wing anti-ice piccolo tube containing a deliberate small breach, it was determined that the wing leading edge ther mal switches were not detecting the consequent bleed leak at the design threshold. As a result, new Airworthiness Limitation tasks, consisting of a functional test of the wing leading edge thermal switches and an inspection of the wing anti-ice duct piccolo tubes, have been introduced in order to limit exposure to dormant failure of the switches in the event of piccolo tube failure, which could potentially compromise the structur al integrity of the wing leading edge and the effectiveness of the wing anti- ice system. This directive mandates the revision of the approved maintenance schedule to include these new tasks, including phase-in

schedules.

This revision clarifies the applicability of t he directive for CL-600-2A12 aircraft, serial numbers 3001 through 3066, and for CL-600-2B16 aircraft, serial numbers 5001 through 5194. The directive is only applicable to these ai rcraft if Bombardier Service Bulletin (SB) 601-0590 [Scheduled Maintenance Instructions (M SG-3) Derived - Qualification] has been incorporated. There is no change r equired to the approved maintenance schedule if SB 601-0590 has not been incorporated.

Corrective

Actions: Within 30 days after the effect ive date of this directive:

Revise the Transport Canada approved main tenance schedule by incorporating the thermal switch functional test and piccolo tube inspection requirements (task numbers identified below) contained in the applicable Revision to the Time Limits/Maintenance

Checks Manual as follows:

PSP 601-5 - Time Limits/Maintenance Checks, Revision 38, dated 19 June 2009,

Task Numbers 30-11-00-101 and 30-11-00-102.No.

N ° CF-2009-49R1 2/2

PSP 601A-5 - Time Limits/Maintenance C hecks, Revision 34, dated 19 June 2009,

Task Numbers 30-11-00-101 and 30-11-00-102.

CL-604 - Time Limits/Maintenance Checks, Revision 13, dated 12 August 2009,

Task Numbers 30-11-00-101 and 36-21-00-101.

CL-605 - Time Limits/Maintenance Checks, Revision 1, dated 12 August 2009,

Task Numbers 30-11-00-101 and 36-21-00-101.

Notes:

1. The above referenced tasks contain phase-in schedules, as necessary, for

aircraft that have exceeded the initial task interval.

2. Compliance with superseding Temporary Revisions or later revisions of the

above Time Limits/Maintenance Che cks Manuals, approved by Transport Canada, also satisfies the requi rements of this directive.

Authorization: For Minister of Transport, In frastructure and Communities



### ORIGINAL SIGNED BY

Philip Tang for 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.