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 na me. 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 Can ada, 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 Communica tions 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, result ing in loss of the associated hydraulic system and high-energy impact damage to adjac ent systems and struct ure. The lowest number of flight cycles accumu lated at the time of failure, to date, has been 6 991 flight cycles.

Although there have been no failures to dat e 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 t he 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 syst ems and structure in the potentia l 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 nos e wheel steering and the potential for a runway excursion.No.

N ° CF-2009-39 2/3

This directive gives instructions to perfo rm 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 e ffective 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 A ccumulators 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 cy cles, replace the accumulator within 100 flight cycles after the e ffective date of this directiv e, 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 fli ght 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 afte r 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, Conti nuing 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 accumulato r in accordance with the original issue, dated 10 November 2008, of one of the above SBs m eets 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 applic able 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, In frastructure 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.