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 name. 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 by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Canada, 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 Communications 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 

24-0022 (01-2005)

1/2 No.

CF-2010-04

Issue Date 

27 January 2010 

Number: CF-2010-04 

Subject: Angle of Attack (AOA) Transducer – Resolver Oil Contamination 

Effective: 26 February 2010 

Applicability: All Bombardier Inc. Model CL-600-2B19 aeroplanes, serial number 7003 and 

subsequent, equipped with Thales AOA Transducers Part Number (P/N) 45150340 or

P/N C16258AA 

Compliance: As indicated unless already accomplished. 

Background: The manufacturer has informed Transport Canada that a certain number of the resolver 

stators, which were installed in the AOA transducers, were not cleaned correctly. This 

condition can degrade the AOA transducer performance at low temperatures resulting in 

freezing of the AOA transducer resolver, which may provide inaccurate AOA data to the 

Stall Protection System (SPS). If not corrected, this condition can result in early or late 

activation of the stick shaker and/or stick pusher. 

Corrective 

Actions: 

Within 250 hours air time from the effective date of this directive, verify the serial 

numbers (S/N) of each of the AOA transducers P/N 45150340 or C16258AA installed on 

the aeroplane in accordance with paragraph 1.A. of Bombardier Alert Service Bulletin 

(ASB) A601R-27-157, Revision A, dated 18 January 2010 or later revisions approved by 

the Chief, Continuing Airworthiness, Transport Canada. Verification of the S/N of the 

AOA transducer(s) may be accomplished visually by verifying transducer S/N on the 

aeroplane or by reviewing the maintenance records. 

1. If the S/N is not listed in paragraph 1.A. of the above-mentioned ASB or its approved 

revisions, no further action is required other than compliance with paragraph 4 of this 

directive. 

2. If the S/N is listed in paragraph 1.A. of the above-mentioned ASB or its approved 

revisions and the S/N has a letter “C”, no further action is required other than 

compliance with paragraph 4 of this directive. 

3. If the S/N is listed in paragraph 1.A. of the above-mentioned ASB or its approved 

revisions and the S/N does not have a letter “C”, prior to further flight, replace the 

AOA transducer(s) in accordance with the Accomplishment Instructions, paragraph 2, 

Part C of the above-mentioned ASB or its approved revisions. 

NOTE: Replacement AOA transducer(s) must be either outside the affected S/N

identified in paragraph 1.A. of the above-mentioned ASB or its approved 

revisions, or identified as having been tested by a letter "C" after the 

S/N. 
No.

 N° CF-2010-04 2/2 

4. As of the effective date of this directive, no replacement AOA transducer(s) 

P/N 45150340 or C16258AA with S/N listed in paragraph 1.A. of the abovementioned ASB or its approved revisions are allowed to be installed on CL-600-2B19 

aeroplanes, unless such transducers have been inspected by the manufacturer and 

labeled with a letter “C” after the S/N. 

Authorization: For Minister of Transport, Infrastructure and Communities 

ORIGINAL SIGNED BY

Philip Tang for 

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: Gordanko Jeremic, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

613-996-9178 or e-mail CAW WEB Feedback or any Transport Canada Centre.