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 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)

1/3 No.

CF-2009-39

Issue Date 

27 October 2009 

Number: CF-2009-39 

Subject: Hydraulic Accumulators – Screw Cap/End Cap Failure

Effective: 10 November 2009 

Applicability: Bombardier Inc. Models: 

CL-600-1A11 – Serial Numbers 1004 through 1085 

CL-600-2A12 – Serial Numbers 3001 through 3066 

CL-600-2B16 – Serial Numbers 5001 through 5194 

CL-600-2B16 – Serial Numbers 5301 through 5665 

CL-600-2B16 – Serial Numbers 5701 and subsequent 

Compliance: As indicated below, unless already accomplished. 

Background: Seven cases of on-ground hydraulic accumulator screw cap or end cap failure have been 

experienced on CL-600-2B19 (CRJ) aircraft, resulting in loss of the associated hydraulic 

system and high-energy impact damage to adjacent systems and structure. The lowest 

number of flight cycles accumulated at the time of failure, to date, has been 6 991 flight 

cycles. 

Although there have been no failures to date on any CL-600-1A11, CL-600-2A12 or 

CL-600-2B16 aircraft, the same accumulators as those installed on the CL-600-2B19, 

Part Numbers (P/N) 08-60163-001, 08-60163-002, 08-60164-001 and 08-60164-002, are 

installed on some of the aircraft listed in the Applicability section of this directive. 

Notes: 

1. Earlier accumulators, P/Ns 2770571-102, 2770571-103, 2770571-104 and 

2770571-105, were installed in production on the following aircraft: 

CL-600-1A11 [all Serial Numbers (S/Ns)], CL-600-2A12 (all S/Ns) and 

CL-600-2B16 (S/Ns 5001 through 5194 and 5301 through 5524 only). These 

accumulators do not require inspection or replacement. However, if any of the 

accumulators with the above P/Ns have been replaced in-service by P/Ns

08-60163-001, 08-60163-002, 08-60164-001 and 08-60164-002, these latter 

accumulators require replacement. 

2. The only accumulators ever installed on CL-600-2B16 aircraft, S/Ns 5525 

through 5665 and 5701 and subsequent, are P/Ns 08-60163-001, 

08-60163-002, 08-60164-001 and 08-60164-002; these accumulators require 

replacement. 

A detailed analysis of the systems and structure in the potential line of trajectory of a 

failed screw cap/end cap for each accumulator, P/Ns 08-60163-001, 08-60163-002,

08-60164-001 and 08-60164-002, has been conducted. It has been identified that the 

worst case scenario would be failure of one of the brake accumulator screw caps/end 

caps, resulting in impact damage causing loss of both hydraulic systems No.2 and No.3, 

with consequent loss of both braking and nose wheel steering and the potential for a 

runway excursion. 
No.

 N° CF-2009-39 2/3 

This directive gives instructions to perform identification and records checks, where 

applicable, and replace accumulators, P/Ns 08-60163-001, 08-60163-002, 08-60164-001 

and 08-60164-002, within the time compliance specified. 

Corrective 

Actions: 

Part I: Identification and Records Check 

Within 50 hours air time after the effective date of this directive: 

A. Identification Check 

 Applicable to CL-600-1A11 (all S/Ns), CL-600-2A12 (all S/Ns) and CL-600-2B16 

(S/Ns 5001 through 5194 and 5301 through 5524). 

Determine the P/Ns of the System Accumulators Nos. 1, 2 and 3 and Brake 

Accumulators Nos. 2 and 3 that are installed on the aircraft. 

1) If any of the installed accumulators has one of the following P/Ns, proceed to the 

Records Check in Part I, paragraph B of this directive: 

 08-60163-001 

 08-60163-002 

 08-60164-001 

 08-60164-002 

2) If all of the installed accumulators have one of the following P/Ns, no further 

action is required. Compliance with this directive is complete: 

 2770571-102 

 2770571-103 

 2770571-104 

 2770571-105 

B. Records Check applicable to: 

1) CL-600-2B16 (S/Ns 5525 through 5665, 5701 and subsequent). 

2) CL-600-1A11, CL-600-2A12 or CL-600-2B16 (in the S/Ns range 5001 through 

5194 and 5301 through 5524) that have one or more accumulator(s), P/Ns 

08-60163-001, 08-60163-002, 08-60164-001 or 08-60164-002, installed.

Determine and record the number of flight cycles accumulated by each of the 

accumulators (P/Ns 08-60163-001, 08-60163-002, 08-60164-001 and 08-60164-002) 

installed on the aircraft [i.e. system accumulators Nos. 1, 2 and 3 and brake 

accumulators Nos. 2 and 3]. Proceed to Part II of this directive. 

Part II: Initial Replacement

A. Replacement Schedule 

1) For each accumulator (P/Ns 08-60163-001, 08-60163-002, 08-60164-001 and 

08-60164-002) with more than 3 650 flight cycles, replace the accumulator within 

100 flight cycles after the effective date of this directive, in accordance with Part 

II, Paragraph B of this directive. 

2) For each accumulator (P/Ns 08-60163-001, 08-60163-002, 08-60164-001 and 

08-60164-002) with 3 650 flight cycles or less, replace the accumulator before it 

has accumulated 3 750 flight cycles, in accordance with Part II, Paragraph B of 

this directive. 

3) If it is not possible to determine the flight cycles accumulated for any accumulator 

(P/Ns 08-60163-001, 08-60163-002, 08-60164-001 and 08-60164-002), replace 

the accumulator within 100 flight cycles after the effective date of this directive, in 

accordance with Part II, Paragraph B of this directive. 
No.

 N° CF-2009-39 3/3 

B. Replacement Procedure 

Replace each accumulator (P/Ns 08-60163-001, 08-60163-002, 08-60164-001 and 

08-60164-002) with a new accumulator having the same P/N, in accordance with the 

Accomplishment Instructions of the applicable Service Bulletin (SB) listed below, or later 

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

Model Service Bulletin Date

CL-600-1A11 (CL-600) SB 600-0742 Rev.1 6 July 2009 

CL-600-2A12 (CL-601) SB 601-0597 Rev.1 6 July 2009 

CL-600-2B16 (CL-601-3A/3R) SB 601-0597 Rev.1 6 July 2009 

CL-600-2B16 (CL-604) SB 604-29-008 Rev.1 6 July 2009 

CL-600-2B16 (CL-605) SB 605-29-001 Rev.1 6 July 2009 

 Note: Replacement of an accumulator in accordance with the original issue, dated 

10 November 2008, of one of the above SBs meets the intent of Part II of this 

Directive for that specific accumulator. 

 

Part III: Repeat Replacement 

Replace each accumulator (P/Ns 08-60163-001, 08-60163-002, 08-60164-001 and 

08-60164-002) at or before it has accumulated 3 750 flight cycles, in accordance with the 

Accomplishment Instructions of the applicable SB listed below, or later revisions 

approved by the Chief, Continuing Airworthiness, Transport Canada. 

Model Service Bulletin Date

CL-600-1A11 (CL-600) SB 600-0742 Rev.1 6 July 2009 

CL-600-2A12 (CL-601) SB 601-0597 Rev.1 6 July 2009 

CL-600-2B16 (CL-601-3A/3R) SB 601-0597 Rev.1 6 July 2009 

CL-600-2B16 (CL-604) SB 604-29-008 Rev.1 6 July 2009 

CL-600-2B16 (CL-605) SB 605-29-001 Rev.1 6 July 2009 

Authorization: For Minister of Transport, Infrastructure and Communities 

Derek Ferguson 

Chief, Continuing Airworthiness 

Contact: Mr. Richard Topham, Continuing Airworthiness, Ottawa, telephone 613-952-4357, 

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

Canada Centre.