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 b y the Continuin g Airworthiness Division ( AARDG ) , National Aircraft Certification Branch, Trans p ort Canada, Ottawa, tele p hone 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

2 4-0022 ( 01-2005 ) 1/1 No

. CF-2012-18 Issue Date 29 May 2012

Number: CF-2012-18 Subject: Defective Horizontal Stabilizer Trim Actuators
Effective: 12 June 2012 Applicability: Bombardier Inc. aeroplane model CL-600-2B19, serial numbers 7003 and subsequent, equipped with Horizontal Stabilizer Trim Actuators (HSTA) part number (P/N) 601R92305-5 or vendor P/N 8396-4 with serial numbers: 287, 724, 813, 841, 998, 1031, 1035, 1049, 1053, 1067, 1068, 1136, 1252, 1268, 1303, 1319, 1338, 1354, 1374, 1378, 1445, 1470, 1498, 1513, 1546, 1632, 1736, 1766, 1846, 1849, 2002 through 2009, 2011, 2013 through 2016, 2019, 2020 and 2022. Compliance: As indicated below, unless already accomplished. Background: It was discovered that a number of prim ary wheels on the HSTA P/N 601R92305-5 (or vendor P/N 8396-4) had burr marks. Investigat ion revealed that the burr marks were a result of incorrectly using t he manufacturing process. In addi tion, some rings that were fitted on the primary wheel shaft were found cr acked. If not corrected, this condition may lead to a disconnect of the pitch trim su rface and subsequent loss of pitch control. This AD mandates the removal of the a ffected units that have the above described manufacturing defect.
Corrective Actions: Within 1000 hours air time or 4 months, whichever occurs first, from the effective date of this AD, remove and replace the affect ed HSTA P/N 601R92305-5 or vendor P/N 8396-4 as listed in the applicability section of this AD, in accordance with the Accomplishment Instructions of Part 2 of Bombardier Ae rospace Service Bulletin (SB) 601R-27-159, dated 15 June 2011, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.
A s of the effective date of this AD, it is prohibited for anyone to install HSTA P/N 601R92305-5 or vendor P/N 8396-4 with a se rial number listed in the applicability section of this AD unless the serial number has the suffix “A” beside it.
Authorization: For the Minister of Transport, Infrastructure and Communities 

### ORIGINAL SIGNED BY David Turnbull Director, National Aircraft Certification Contact: Mr. Gordanko Jeremic, Continuing Airworthiness, Ottawa, telephone 613-952-4379, facsimile 613-996-9178 or e-mail ADs@tc.gc.ca or any Transport Canada Centre.