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 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 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

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

. CF-2010-04

Issue Date 27 January 2010

Number: CF-2010-04

Subject: Angle of Attack (AOA) Transdu cer – 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, whic h 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 dat e 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 J anuary 2010 or later revisions approved by the Chief, Continuing Airworthiness, Transpor t Canada. Verification of the S/N of the

A OA transducer(s) may be accomplished visua lly 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) mu st be either outside the affected S/N identified in paragraph 1.A. of t he 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 di rective, no replacement AOA transducer(s)

P/N 45150340 or C16258AA with S/N list ed 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, In frastructure 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.