AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CL- 600/49 and issues the following 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-600/49

Amdt 1

Angle of Attack Transducer 2/2005 DM

Applicability: Model CL-600 “Challenger” aeroplanes listed in the following table:

Aeroplane Model Serial Number Range

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

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

1004 to 1085

3001 to 3066

5001 to 5194

5301 to 5579

Requirement: 1. Unless previously accomplished, amend the Aircraft Flight Manual (AFM) by inserting the applicable Temporary Revision (TR) detailed below:

Note 1: Amendment of the AFM may have been accomplished in accordance with AD/CL-600/49 or Transport Canada AD CF-2002-05R1.

2.         Unless previously accomplished, carry out the checks specified in sub-paragraphs

2.a.  through 2.c. in accordance with paragraph 2.A. Aircraft Setup and paragraph

2.B Part A - Special Check, of the Accomplishment Instructions of the following applicable Bombardier Aerospace Alert Service Bulletin (ASB) or later revisions approved by Transport Canada:

Aircraft Model ASB

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

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

A600-0715 dated 7 January 2002, or

A600-0715 R1 dated 27 February 2004

A601-0550 dated 7 January 2002, or

A601-0550 R1 dated 27 February 2004

A601-0550 dated 7 January 2002, or

A601-0550 R1 dated 27 February 2004

A604-27-011 dated 7 January 2002, or

A604-27-011 R1 dated 27 February 2004

1. Conduct a special check of both the left and right angle of attack (AOA) transducers and record the voltage and vane angle value results for the shaker and pusher firing angles.

b.        Assess the recorded voltages against the voltage tolerances specified in Table

1.1 and Table 1.2 of Appendix A of the above referenced applicable ASB. If any of the voltages are outside of the specified tolerances, replace the unserviceable Stall Protection Computer and then repeat the initial special check of both the left and right AOA transducers as specified in Requirement

2.a. Repeat the assessment of the recorded voltages as detailed above in this paragraph.

c.         Assess the recorded vane angles for the shaker and the pusher against the tolerances detailed in Table 1.1 and Table 1.2 of Appendix A. and, if required, against the expanded tolerances detailed in Table A of the Accomplishment Instructions of the above referenced applicable ASB.

(i)       If all of the recorded vane angles, for both AOA transducers, are within the tolerances in Table 1.1 and Table 1.2, the AOA transducers can remain in service and no further checks are required under Requirement

2.    However, compliance with Requirement 4 is required before the aircraft is returned to service.

(ii)     If one or more recorded vane angles for either or both of the AOA transducers is outside the tolerances in Table 1.1 and Table 1.2 of Appendix A but all recorded vane angles are within the expanded tolerances in Table A of the Accomplishment Instructions of the applicable ASB, replacement of the out-of-tolerance AOA transducer(s) may be delayed for 150 hours time in service (TIS) from the date that the check is carried out. Until Requirement 4 is completed, continue to comply with the applicable AFM TR, or later approved version, introduced under Requirement 1.

Note 2: AOA special check may have been accomplished in accordance with AD/CL- 600/49 or Transport Canada AD CF-2002-05R1.

3.         If, as a result of the Requirement 2 checks, any of the recorded vane angles is outside the expanded tolerances in Table A of the applicable ASB, comply with Requirement 4.

4.         Remove any AOA transducer or transducer assembly that was not within the tolerances in Table 1.1 and 1.2 of Appendix A and install a new AOA transducer or transducer assembly. On each newly installed AOA transducer or transducer assembly, measure the AOA vane angles and voltage readings for shaker and pusher and ensure that the values are within the ranges specified. The foregoing shall be accomplished in accordance with paragraph 2.C. Part B of the Accomplishment Instructions of the applicable ASB as listed at Requirement 2.

5.         Remove the applicable AFM amendment introduced under Requirement 1 of this Directive.

6.         Amend the approved Maintenance Schedule by incorporating the Time Limits Maintenance Checks (TLMC) introduced by the following temporary revisions (TRs) to the appropriate Aircraft Maintenance Manuals (AMM):

Aeroplane 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 605 TR 5-124 dated 27 February 2004

PSP 601-5 TR 5-210 dated 27 February 2004

PSP 601A-5 TR 5-228 dated 27 February 2004

TLMC TR 5-2-16, dated 27 February 2004

Note 3: Transport Canada AD CF-2002-05R1 refers.

Compliance: For Requirement 1:

Aeroplanes with 300 or more hours time in service (TIS) since new - Within seven days of the effective date of this Directive, unless Requirement 4 of this Directive has been complied with.

Aeroplanes with less than 300 hours TIS at the effective date of this Directive - Before reaching 300 hours TIS unless Requirement 4 of this Directive has been complied with.

For Requirement 2:

Aeroplanes with more than 100 hours TIS since new - At or before accumulating 200 hours TIS from the effective date of this Amendment.

Aeroplanes with 100 hours TIS or less since new - At or before accumulating 300 hours TIS since new.

For Requirement 3 - Before further flight after the Requirement 2 check.

For Requirement 4 - Except as authorised under Requirement 2.c.(ii) above, before returning the aircraft to service following completion of the checks specified under Requirement 2.

For Requirement 5 - Following compliance with Requirement 4.

For Requirement 6 - Within 30 days after the effective date of this Amendment. This Amendment becomes effective on 22 December 2004.

Background: Bombardier Aerospace has determined that the potentiometers of the angle of attack transducers can develop flat spots which can cause a delay in the 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 an in service aircraft through introduction of a special check.

The original issue of this Directive required the amendment of the AFM and special checks of AOA transducers.

This Amendment amends the applicability for CL-604 aeroplanes, corrects the reference for the CL-604 AFM TR, deletes the repetitive AOA checks required by the original issue of this Directive and introduces an AOA check in the TLMC of the applicable AMM.

The original issue of this Airworthiness Directive became effective on 6 March 2002.

James Coyne

Delegate of the Civil Aviation Safety Authority 16 December 2004

The above AD is notified in the Commonwealth of Australia Gazette on 22 December 2004.