AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes

AD/CL-600/62 Angle of Attack Vane 2/2005 TX

Applicability: Bombardier Inc. “Challenger” aircraft listed below with angle of attack (AOA) vane Part Number (P/N) 600-59154-5 installed:

Aircraft Model

CL-600-1A11 (CL-600) CL-600-2A12 (CL-601)

CL-600-2B16 (CL-601-3A/-3R) CL-600-2B16 (CL-604)

Serial Number Range

1004 to 1085

3001 to 3066

5001 to 5194

5301 and subsequent

Requirement: 1. Amend the Aircraft Flight Manual (AFM) by inserting the applicable Temporary Revision (TR) detailed below.

Later approved revisions of these TRs are also acceptable.

2.         Carry out a transducer linearity check of AOA vanes P/N 600-59154-5 in accordance with Accomplishment Instructions Part A - Special Check - AOA Transducer Linearity Check of the following applicable Alert Service Bulletin (ASB) or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada:

Aircraft Model

CL-600-1A11 (CL-600) CL-600-2A12 (CL-601)

CL-600-2B16 (CL-601-3A/-3R) CL-600-2B16 (CL-604)

ASB

A600-0729 dated 14 October 2004

A601-0571 dated 14 October 2004

A601-0571 dated 14 October 2004

A604-27-026 dated 14 October 2004

3.         If, during the Requirement 2 check, the transducer does not meet the linearity requirements defined in the applicable Aircraft Maintenance Manual (AMM) detailed below, replace the AOA vane with a serviceable unit.

Aircraft Model

CL-600-1A11 (CL-600) CL-600-2A12 (CL-601)

CL-600-2B16 (CL-601-3A/-3R) CL-600-2B16 (CL-604)

AMM

PSP 602 Chapter 27-39-11

PSP 601-2 Chapter 27-39-11

PSP 601-2 Chapter 27-39-11

AMM Task 27-35-04-720-801

Note: Transport Canada AD CF-2004-22 refers.

Compliance: For Requirement 1 - Within seven days after the effective date of this Directive.

For Requirement 2:

1. Aircraft with 50 hours time in service (TIS) since installation of an AOA vane P/N 600-59154-5 - Before accumulating 50 hours TIS from the effective date of this Directive and thereafter at intervals not to exceed 100 hours TIS.

b.        Aircraft with less than 50 hours TIS since installation of an AOA vane P/N 600-59154-5 - At or before accumulating a total of 100 hours TIS since installation of the AOA vane and thereafter at intervals not to exceed 100 hours TIS.

For Requirement 3 - Before the next flight.

This Airworthiness Directive becomes effective on 15 December 2004.

Background: Transport Canada has advised that AOA vanes P/N 600-59154-5 can develop premature wear of the potentiometer which can delay the stall computer commands for stall warning, stick shaker and stick pusher operation. The problem is dormant and an out-of-tolerance AOA transducer can only be identified on in service aircraft through a maintenance check of the transducer resistance.

James Coyne

Delegate of the Civil Aviation Safety Authority 9 December 2004

The above AD is notified in the Commonwealth of Australia Gazette on 15 December 2004.