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)

1/1 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 corrected, can cause flap system failure. In certain 

weather and runway conditions, frequent flap system failures pose a safety concern. 

To improve the internal actuator sealing, the flap actuator manufacturer has redesigned 

the inboard pinion seal. Transport Canada Civil Aviation (TCCA) has been monitoring, 

through an actuator sampling program, the performance 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 data, TCCA is mandating a restoration task 

to install the redesigned flap actuator inboard pinion seal on all applicable actuators. 

Corrective 

Actions:

Revise the CL-600-2B19 TCCA approved Maintenance 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 Aircraft Maintenance Requirement Manual, 

Part 2 – Appendix A, Certification Maintenance Requirements. 

The above referenced tasks contain phase-in schedules, as applicable, for aeroplanes 

with actuators that have exceeded the initial task interval. 

Compliance in accordance with superseding TRs or later revisions of the above 

mentioned Maintenance Requirement Manual 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.