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)

1/3 No.

CF-2010-36R1

Issue Date 

 18 July 2013 

Number: CF-2010-36R1 

Subject: Main Landing Gear Door – Fairing Seal Interference 

Effective: 31 July 2013 

Revision: Supersedes Airworthiness Directive CF-2010-36, issued 18 October 2010. 

Applicability: Bombardier Inc.: 

Model CL-600-2C10 aeroplanes, serial numbers 10002 through 10333, 

Model CL-600-2D15 and CL-600-2D24 aeroplanes, serial number 15001 through 

15284. 

Compliance: As indicated below, unless already accomplished. 

Background: Two cases of main landing gear (MLG) failure to fully extend have been reported. 

An MLG failing to extend may result in an unsafe asymmetric landing configuration. 

Preliminary investigation has shown that interference between the MLG door and the 

MLG fairing seal prevented the MLG door from opening. 

This AD mandates the inspection and rectification, as required, of the MLG fairing and 

seal, MLG door, and adjacent structures. 

Data collected from the Original Issue of this AD shows potential deficiencies with the 

inspection. This AD is revised to update the applicability section and to introduce 

additional mitigating actions and the terminating action. 

Corrective 

Actions: 

Part I - Inspections applicable to aeroplanes installed with MLG fairing seal part 

number (P/N) CC670-39244-1 or P/N CC670-39244-2 

A. Initially, use the following schedule: 

1. For aeroplane serial numbers 10002 to 10313; 15001 to 15238; and 15240 to 

15255, within 50 flight cycles from the effective date of the original issue of 

this AD (18 October 2010). 

2. For all other aeroplane serial numbers, within 600 hours air time from the 

effective date of the original issue of this AD (18 October 2010). 

B. Perform a detailed inspection of the MLG fairing and seal, MLG door and adjacent 

structures in accordance with Part A of the Accomplishment Instructions of 

Bombardier Alert Service Bulletin (ASB) A670BA-32-030, Revision C, dated 

13 March 2013, or later revisions approved by the Chief, Continuing Airworthiness, 

Transport Canada. 
No.

N° CF-2010-36R1 2/3 

Inspections in accordance with previous revisions of Bombardier 

ASB A670BA-32-030 also meets the requirements of this paragraph. 

1. If no damage is found, proceed to Part I, C of this AD. 

2. If damage to the MLG fairing seal is found, complete either Part E or Part C of 

the Accomplishment Instructions of the above-mentioned ASB. 

Completion in accordance with Part C of the Accomplishment Instructions of 

previous revisions of the above-mentioned ASB also meets the requirements of 

this paragraph. 

3. If Part C of the Accomplishment Instructions of the above-mentioned ASB is 

used for compliance with Part I, B, 2 of this AD, Part D of the Accomplishment 

Instructions of the above-mentioned ASB must be completed if the MLG door is 

to be reinstalled. 

4. For all other damage or missing parts/fasteners found, contact Bombardier 

Regional Aircraft Customer Response Center for approved repair prior to further 

flight. The approved repair must specifically reference this AD. 

5. If Part E of the Accomplishment Instructions of the above-mentioned ASB is used 

for compliance with Part I, B, 2 of this AD, proceed to Part III of this AD for 

inspection instructions. 

C. Subsequently, at intervals not to exceed 200 hours air time from previous inspection, 

repeat the inspection and rectification detailed in Part I, B above. 

Phase in for Part I, C of this AD: within 200 hours air time from the effective date of 

this AD or within 600 hours air time from previous inspection, whichever occurs first. 

D. [Removed] 

Part I, C of this AD is not required if the MLG door has been removed. The repetitive 

inspection in accordance with Part I, C of this AD resumes when Part D of the 

Accomplishment Instructions of the above-mentioned ASB is completed. 

Part II - Replacement of MLG fairing seals P/N CC670-39244-1 and 

P/N CC670-39244-2 with MLG fairing seals P/N CC670-39244-5 and 

P/N CC670-39244-6 

Within 2500 hours air time or 12 months, whichever occurs first, from the effective date of 

this AD, replace MLG fairing seals P/N CC670-39244-1 and P/N CC670-39244-2 with 

MLG fairing seals P/N CC670-39244-5 and P/N CC670-39244-6 in accordance with 

Part E of the Accomplishment Instructions of Bombardier ASB A670BA-32-030, 

Revision C, dated 12 March 2013, or later revisions approved by the Chief, 

Continuing Airworthiness, Transport Canada. 

Proceed to Part III of this AD for inspection instructions after completion of Part II of 

this AD. 

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

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

reinstalled. 

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

reinstallation, complete Part IV of this AD. 
No.

N° CF-2010-36R1 3/3 

Part III - Inspections applicable to aeroplanes installed with MLG fairing seal 

P/N CC670-39244-5 or P/N CC670-39244-6 

A. Within 600 hours air time from installation of MLG fairing seals P/N CC670-39244-5 

and P/N CC670-39244-6, perform a detailed inspection of the MLG fairing and seal, 

MLG door and adjacent structures in accordance with Part A of the Accomplishment 

Instructions of Bombardier ASB A670BA-32-030, Revision C, dated 12 March 2013, 

or later revisions approved by the Chief, Continuing Airworthiness, Transport 

Canada. 

1. If no damage is found, proceed to Part III, B of this AD. 

2. If damage to the MLG fairing seal is found, replace the damaged seal in 

accordance with Part F or Part G of the Accomplishment Instructions of the 

above-mentioned ASB as required, or complete Part C of the Accomplishment 

Instructions of the above-mentioned ASB. 

3. If Part C of the Accomplishment Instructions of the above-mentioned ASB is 

used for compliance with Part III, A, 2 of this AD, Part D of the Accomplishment 

Instructions of the above-mentioned ASB must be completed if the MLG door is 

to be reinstalled. 

4. For all other damage or missing parts/fasteners found, contact Bombardier 

Regional Aircraft Customer Response Center for approved repair prior to further 

flight. The approved repair must specifically reference this AD. 

B. Subsequently, at intervals not to exceed 600 hours air time from previous inspection, 

repeat the inspection and rectification detailed in Part III, A of this AD. 

Part III, B of this AD is not required if the MLG door has been removed. The repetitive 

inspection in accordance with Part III, B of this AD resumes when Part D of the 

Accomplishment Instructions of the above ASB is completed. 

Part IV - Terminating Action 

Within 6600 hours air time or 36 months, whichever occurs first, from the effective date of 

this AD, incorporate the modification “Increase the Clearances Between the MLG Fairing 

and the MLG Door” in accordance with Bombardier SB 670BA-32-040, 

Revision A, dated 25 February 2013, or later revisions approved by the Chief, 

Continuing Airworthiness, Transport Canada. 

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

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

is reinstalled. 

Parts I, II and III of this AD are no longer required after the completion of Part IV of 

this AD. 

Authorization: For the Minister of Transport, Infrastructure and Communities, 

ORIGINAL SIGNED BY 

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: 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.