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/ addr ess.asp
2 4-0022 ( 01-2005 ) 1/1 No

. CF-2012-26 Issue Date 30 October 2012

Number: CF-2012-26 Subject: Flap Actuator Seal Replacement
Effective: 14 November 2012 Applicability: Bombardier Inc. aeroplane model CL-600-2B19 equipped with Eaton Flap Actuators part numbers (P/N): P/N 601R93101-23/-25 (vendor P/N 852D100-23, -25), P/N 601R93103-23/-24 (vendor P/N 853D100-23, -24), P/N 601R93104-23/-24 (vendor P/N 854D100-23, -24) Compliance: Within 30 days from the effective date of this AD, unless already accomplished. Background: The CL-600-2B19 aeroplane flap actuator inboard pinion seal is prone to leak which can cause internal contamination of the actuator braking mechanism and subsequent actuator failure. This condition, if not corre cted, can cause flap system failure. In certain weather and runway conditions, frequent flap sy stem failures pose a safety concern. To improve the internal actuator sealing, the flap actuator manufacturer has redesigned the inboard pinion seal. Transport Canada Ci vil Aviation (TCCA) has been monitoring, through an actuator sampling program, the per formance of the flap system since the introduction of actuators equipped with this new inboard pinion seal. Based on this sampling program and recent flap reliability dat a, TCCA is mandating a restoration task to install the redesigned flap actuator inboar d pinion seal on all applicable actuators. Corrective Actions: Revise the CL-600-2B19 TCCA approved Ma intenance Schedule by incorporating tasks C27-50-111-15 and C27-50-111-17 as introduced by Temporary Revision (TR) 2A-48, dated July 06, 2012 of the A ircraft Maintenance Requirement Manual, Part 2 – Appendix A, Certificat ion Maintenance Requirements. The above referenced tasks contain phase-in schedules, as applicable, for aeroplanes with actuators that have exc eeded the initial task interval. Compliance in accordance with superseding TRs or later revisions of the above mentioned Maintenance Requirement M anual approved by Transport Canada also satisfies the requirements of this AD.
Authorization: For the Minister of Transport, Infrastructure and Communities, 

### ORIGINAL SIGNED BY Derek Ferguson Chief, Continuing Airworthiness Contact: Gordanko Jeremic, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 613-996-9178 or e-mail ADs@tc.gc.ca or any Transport Canada Centre.