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-2012-17

Issue Date 

 24 May 2012 

Number: CF-2012-17 

Subject: Aft Entry & Aft Service Doors - Translating Door Handle Jamming

Effective: 7 June 2012 

Applicability: Bombardier Inc. DHC-8 aeroplane models 400, 401, and 402, serial numbers 4001 

through 4364

Compliance: As indicated below, unless already accomplished. 

Background: There was one reported case of the translating door handle jamming on opening. It was 

found that the pin on the existing handle shaft could migrate and cause the translating 

door handle to jam. A jammed translating door handle could prevent the opening of the 

door and impede evacuation in the event of an emergency. 

This AD mandates the installation of the single piece machined handle shaft 

(ModSum 4-113687) on the aft entry door and the aft service door, as well as the 

incorporation of the new Airworthiness Limitation (AWL) tasks introduced as a result of 

this ModSum. 

Corrective 

Actions: 

Part I - Incorporation of the Single Piece Machined Handle Shaft on the Aft Entry 

Door and the Aft Service Door 

Within 6000 hours air time or 36 months, whichever occurs first, from the effective date of 

this AD, incorporate ModSum 4-113687 (Machined Handle Shaft) on the aft entry door 

and the aft service door in accordance with the Accomplishment Instructions of 

Bombardier Service Bulletin (SB) 84-52-66, Revision A, dated 24 October 2011, or later 

revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 

Incorporation of ModSum 4-113687 in accordance with SB 84-52-66, Initial Issue, dated 

25 July 2011, also meets the requirements of Part I of this AD. 

Part II - Revision of the Maintenance Schedule 

Within 30 days from the effective date of this AD, revise the Transport Canada approved 

maintenance schedule by incorporating maintenance task numbers 521200-105 and 

524100-105 introduced in Temporary Revision (TR) ALI-122 to Dash-8 Series 400 

Maintenance Requirements Manual (MRM), PSM 1-84-7, Part 2, Section 1 Certification 

Maintenance Requirements. 

Revision of Transport Canada approved maintenance schedule with maintenance task

numbers 521200-105 and 524100-105 introduced by TR ALI-116, dated 29 July 2011, 

also meets the requirements of Part II of this AD. 
No.

N° CF-2012-17 2/2 

Compliance in accordance with superseding TRs or later revisions of the AWL section of 

the MRM, approved by Transport Canada, also meets the requirements of Part II of this 

AD. 

Authorization: For the Minister of Transport, Infrastructure and Communities 

ORIGINAL SIGNED BY

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: Miss Helen Tsai, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

613-996-9178 or e-mail ADs@tc.gc.ca or any Transport Canada Centre.