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) 593. 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-2009-33

Issue Date 

 28 July 2009 

Number: CF-2009-33 

Subject: Thrust Reverser – Transcowl Assembly Cracking

Effective: 18 August 2009 

Applicability: Bombardier Inc. Models: 

CL-600-2C10, Serial Numbers 10003 through 10265 

CL-600-2D15 and CL-600-2D24, Serial Numbers 15001 through 15192 

Compliance: As indicated below, unless already accomplished. 

Background: Several cases have been reported of cracks in the joint extrusions securing the outer bondment 

to the acoustic panel of the nacelle transcowl assemblies. Although there is no effect on flight 

safety (thrust reverser stowed), thrust reverser deployment under rejected take-off or emergency 

landing load conditions could potentially result in acoustic panel failure and possible runway 

debris. 

This directive mandates inspection, repair (if necessary) and reinforcement of the transcowl 

assemblies. 

 

Corrective 

Actions: 

Part I: Identification Check (Maintenance Records or Visual) 

Within 5 000 hours air time or 24 months after the effective date of this directive, whichever 

comes first, check the part number (P/N), serial number (S/N) and repair status, if applicable, of 

each transcowl assembly: 

A. If all transcowl assemblies installed on the aircraft meet one of the following conditions, 

no further action is required and compliance with this directive is complete: 

1) P/Ns KCN624-2003-3, -5 or –7; or 

2) P/Ns CN624-2001-XXX or KCN624-2001-X (XXX and X: various dash numbers), 

with S/N SB0965 or higher; or 

3) P/Ns CN624-2001-XXX or KCN624-2001-X (XXX and X: various dash numbers), 

and repaired in accordance with one of the Repair Engineering Orders (REOs) 

listed in paragraph 1.D of Bombardier Service Bulletin (S/B) 670BA-78-008, 

Revision A, dated 10 July 2009, or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada. 

B. If one or more of the transcowl assemblies has P/Ns CN624-2001-XXX or 

KCN624-2001-X (XXX and X: various dash numbers), with S/N SB0964 or lower, and 

has not been repaired in accordance with one of the Repair Engineering Orders (REOs) 

listed in paragraph 1.D of Bombardier S/B 670BA-78-008, Revision A, dated 10 July 

2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport 

Canada, proceed to Part III of this directive. 

Part II: Inspection Following a High Energy Stop or Rejected Take-Off (RTO) 

As of the effective date of this directive: 

A. Following a high-energy stop or RTO, carry out a detailed visual inspection of each 

transcowl assembly (left and right, upper and lower) before further flight, as detailed in 

the Aircraft Maintenance Manual (AMM), Task 05-51-27-210-801. 
No.

 N° CF-2009-33 2/2 

B. If any cracks are detected on one or more of the transcowl assemblies, repair and 

reinforce the cracked part(s) in accordance with Part III of this directive before further 

flight. 

Notes: 

1. Part II of this directive is no longer applicable following accomplishment of Part III. 

2. AMM Temporary Revisions TR 05-0041, dated 6 February 2009, and TR-05-0042, 

dated 9 February 2009, introduced inspection of the transcowl assemblies into Task 

05-51-27-210-801 (Config. A01 and A02). 

Part III: Inspection, Repair (if necessary) and Reinforcement 

Within 5 000 hours air time or 24 months after the effective date of this directive, whichever 

comes first, unless required before further flight after a high energy stop or RTO, as specified in 

Part II: 

Inspect, repair (if necessary) and reinforce the joint extrusion on each transcowl, in accordance 

with the Accomplishment Instructions of Bombardier S/B 670BA-78-008, Revision A, dated 10 

July 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 

Notes: 

1. Part III is only required as determined in Part I, paragraph B or in Part II, paragraph 

B of this directive. 

2. Accomplishment in accordance with the original issue of Bombardier 

S/B 670BA-78-008, dated 19 September 2008, also meets the intent of Part III of 

this directive. 

Part IV: Replacement Parts 

Following compliance with Part I of this directive: 

No replacement/spare transcowl assembly, P/Ns CN624-2001-XXX or KCN624-2001-X (XXX and 

X: various dash numbers), with S/N SB0964 or lower, is permitted to be installed on the aircraft, 

unless it has been repaired in accordance with one of the Repair Engineering Orders (REOs) 

listed in paragraph 1.D of Bombardier S/B 670BA-78-008, Revision A, dated 10 July 2009, or 

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

Authorization: For Minister of Transport, Infrastructure and Communities 

Anthony Wan 

Acting Chief, Continuing Airworthiness 

Contact: Mr. Richard Topham, Continuing Airworthiness, Ottawa, telephone 613-952-4428, facsimile 

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