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TP 7245E 1 Of 2 

AD Number: CF-2014-42 

Issue Date: 28 November 2014 

AIRWORTHINESS DIRECTIVE The tono•.v\ng airworthiness directive CAO) may be aQplicablc to an aircraft whldl our reCOfdS indicate is registered in your name. ADs are iss.ued purs. uant to Canadian Aviation Regulation (CAR) 521 Division X. F'ursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H. the conbnuing aitWOrthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply v.1th the requirements of an AD may invalidate the flight authorizabon of the airaaft Altemabve means of compliance shall l>e applied for in accordance with CAR 605.84 and the above-referenced Standard. 

This AD has l>een issued l>y the Continuing Ai1worthiness Division (AARDG). National Aircraft Certification Branch. Transport Canada. Ottawa. telephone 6 13 952-4357. 

Number: CF-2014-42 Effective Date: 12 December 2014 

ATA: 32 Type Certificate: A-131 

Subject: Landing Gear- Main Landing Gear Door Forward Member Cracking 

Applicability: Bombardier Inc. model CL-600-2C10 aeroplanes, serial number 10002 and subsequent, 

equipped with inboard Main Landing Gear (MLG) door part numbers included in 

Section 1.A, Effectivity, of Bombardier Service Bulletin (SB) 670BA-32-042, Revision A. 

dated 2 July 2014. 

Compliance: As indicated below, unless already accomplished. 

Background: Cases of inboard MLG doors with cracked door forward members were found. A cracked 

inboard MLG door forward member could result in door departure from the aeroplane. 

Loss of an MLG door during flight could result in damage to the aeroplane and injury to 

persons on the ground. 

This AD mandates the repetitive inspection and replacement of the inboard MLG doors. 

Corrective Actions: 

Part I - Repetitive Inspection 

Perform a detailed visual inspection of the inboard MLG doors, and rectify as required, in 

accordance with the Accomplishment Instructions of Bombardier SB 670BA-32-042, 

Revision A. dated 2 July 2014, or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada, using the following schedule: 

A. Initially, within 660 hours air time or one year, whichever occurs first, from the 

effective date of this AD; and 

B. Subsequently, at intervals not to exceed 660 hours air time or one year, whichever 

occurs first. 

Part I of this AD is not required if the MLG door has been removed. This alleviation is 

applicable only to the removed MLG door. The repetitive inspection in accordance with 

Part I of this AD resumes when the MLG door is reinstalled. 

If the compliance time of Part II of this AD is reached at the time of the MLG door 

reinstallation, complete Part II of this AD. 

Part II- Terminating Action 

Within 6600 hours air time or 3 years, whichever occurs first, from the effective date of 

this AD, replace the inboard MLG doors in accordance with the Accomplishment 

Instructions of Bombardier SB 670BA-32-043 Revision A, dated 13 November 2014, or 

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

If the MLG door has been removed at the compliance time of Part II of this AD, 

incorporation of the above-mentioned replacement can be delayed until the MLG door is 

reinstalled. This alleviation is applicable only to the removed MLG door. 

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall. within seven days. notify the Mini ster 

1n writing of any change of his or her name or address. 

For all changes to your mailing address. contact your TC Reg,onal Aircraft RegiStration Office at t-800-305-2059. Canada option 1 for EngliSh, 2 for Aircraft Reglsvation and then seleCI the appropriate region. 

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CF-2014-42 2 of 2 

Part II of this AD constitutes terminating action to this AD. Part I of this AD is no longer 

required after accomplishment of Part II of this AD. 

Note: Incorporation of Bombardier SB 670BA-32-040 is still required to meet the 

requirements of Part IV of AD CF-2010-36R1. 

Part Ill - Alternative Means of Compliance 

The following are acceptable options which meet the requirements of Part II of this AD: 

A. Incorporation of Bombardier SB 670BA-32-043, Initial Issue, dated 2 July 2014, in 

conjunction with ModSum 18670528200033; 

B. Installation of inboard MLG door assembly with part numbers listed in the "Post-SB 

Part Number" column of Section M, Relationship Chart, of Bombardier 

SB 670BA-32-043, Initial Issue, dated 2 July 2014; 

C. Incorporation of Part C and Part D of the Accomplishment Instructions of Bombardier 

SB 670BA-32-040, Revision E, dated 13 November 2014, or later revisions approved 

by the Chief, Continuing Airworthiness, Transport Canada; or 

D. Incorporation of Part C and Part D of the Accomplishment Instructions of Bombardier 

SB 670BA-32-040, Revision D, dated 2 July 2014, in conjunction with ModSum 

IS670528200033. 

Part IV- Spares 

Upon completion of Part II or Part Ill of this AD, it is prohibited for anyone to install 

inboard MLG door assemblies with part numbers listed in the "Pre-SB Part Number" 

column of Section M, Relationship Chart, of Bombardier SB 670BA-32-043, Initial Issue, 

dated 2 July 2014. 

Authorization: For the Minister of Transport, 

Contact: 

ORIGINAL SIGNED BY 

Derek Ferguson 

Chief, Continuing Airworthiness 

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

996-9178 or e-mail AD-CN@tc.gc.ca or any Transport Canada Centre.