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)

1/4 No.

CF-2010-24

Issue Date 

 3 August 2010 

 Number: CF-2010-24 

Subject: Hydraulic Accumulators – Screw Cap/End Cap Failure

Effective: 18 August 2010 

Applicability: Bombardier Inc. Model CL-600-2B19, Serial Numbers 7003 and subsequent. 

Compliance: As indicated in Parts I through VII below, unless already accomplished. 

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

experienced on CL-600-2B19 aeroplanes, resulting in the 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 6991 flight 

cycles. 

The part numbers (P/N) of the accumulators currently installed on CL-600-2B19 aeroplanes 

are 601R75138-1 (08-60163-001 or 08-60163-002) [Hydraulic System No. 1, Hydraulic 

System No. 2, Inboard Brake and Outboard Brake accumulators] and 601R75138-3

(08-60164-001 or 08-60164-002) [Hydraulic System No. 3 accumulator]. 

A detailed analysis of the calculated line of trajectory of a failed screw cap/end cap for each 

of the accumulators has been conducted, resulting in the identification of several areas

where systems and/or structural components could potentially be damaged. Although all of 

the failures to date have occurred on the ground, an in-flight failure affecting such 

components could potentially have an adverse effect on the controllability of the aeroplane. 

This directive gives instructions to amend the Airplane Flight Manual (AFM), remove two 

accumulators (Hydraulic System No. 2 and No. 3) from the aeroplane and conduct repetitive 

ultrasonic inspections of the Hydraulic System No. 1, Inboard Brake and Outboard Brake

accumulators that are not identified by the letter “T” after the serial number (S/N) on the 

identification plate for cracks until they are replaced by new accumulators P/N 601R75139-1 

(11093-4). 

Corrective 

Actions: 

Part I: AFM Change 

Within 30 days after the effective date of this directive: 

A. Amend the AFM, CSP A-012, by inserting Temporary Revision (TR) No. RJ/186, dated 

16 December 2008, or later approved changes to this TR.

Advise all flight crews of the changes introduced in the AFM TR. 

Part II: Deactivation of the Hydraulic System No. 3 Accumulator 

Within 250 flight cycles after the effective date of this directive: 

Deactivate the Hydraulic System No. 3 accumulator, in accordance with Part A of the 

Accomplishment Instructions in Bombardier Aerospace Alert Service Bulletin (ASB) 

A601R-29-031, Revision A, dated 26 March 2009, or later revisions approved by the Chief, 

Continuing Airworthiness, Transport Canada. 
No.

 N° CF-2010-24 2/4 

Notes: 

1. Deactivation in accordance with Part A of the original issue of ASB 

A601R-29-031, dated 23 December 2008, also meets the intent of Part II of this 

directive. 

2. Accomplishment of Part II of this directive is not applicable if the accumulator 

has already been removed in accordance with Part IV of this directive. 

3. The instructions in AFM TR No. RJ/186, dated 16 December 2008, or later 

approved changes to this TR, are applicable following accomplishment of Part II 

of this directive. 

Part III: Removal of the Hydraulic System No. 2 Accumulator 

Within 500 flight cycles after the effective date of this directive: 

Remove the Hydraulic System No. 2 accumulator, in accordance with the Accomplishment 

Instructions in Bombardier Aerospace Service Bulletin (SB) 601R-29-032, Revision A, dated 

26 January 2010, or later revisions approved by the Chief, Continuing Airworthiness, 

Transport Canada. 

Note: Removal in accordance with the original issue of SB 601R-29-032, dated

12 November 2009, also meets the intent of Part III of this directive. 

Part IV: Removal of the Hydraulic System No. 3 Accumulator 

Within 1000 flight cycles after the effective date of this directive: 

Remove the Hydraulic System No. 3 accumulator, in accordance with Part B of the 

Accomplishment Instructions in Bombardier Aerospace ASB A601R-29-031, Revision A, 

dated 26 March 2009, or later revisions approved by the Chief, Continuing Airworthiness, 

Transport Canada. 

Notes: 

1. Removal in accordance with Part B of the original issue of ASB A601R-29-031, 

dated 23 December 2008, also meets the intent of Part IV of this directive. 

2. The instructions in AFM TR No. RJ/186, dated 16 December 2008, or later 

approved changes to this TR, are applicable following accomplishment of Part 

IV of this directive. 

Part V: Initial Ultrasonic Inspections of Hydraulic System No. 1, Inboard Brake and 

Outboard Brake Accumulators 

 

A. Inspection Schedule 

1) For each accumulator without the letter “T” after the S/N on the identification plate and 

with more than 4500 flight cycles, inspect the accumulator within 500 flight cycles 

after the effective date of this directive, in accordance with Part V, Paragraph B of this 

directive. 

2) For each accumulator without the letter “T” after the S/N on the identification plate and 

with 4500 or less flight cycles, inspect the accumulator before it has accumulated 

5000 flight cycles, in accordance with Part V, Paragraph B of this directive. 

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

without the letter “T” after the S/N on the identification plate, inspect the accumulator 

within 500 flight cycles after the effective date of this directive, in accordance with Part 

V, Paragraph B of this directive. 

Note: Accomplishment of Part V of this directive is not applicable for any accumulator that 

has letter “T” after the S/N on the identification plate or has already been replaced in 

accordance with Part VII of this directive. 
No.

 N° CF-2010-24 3/4 

B. Inspection Procedures 

1) Inspect each accumulator in accordance with Part B of the Accomplishment 

Instructions in the applicable Bombardier Aerospace ASB listed below, or later 

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

Accumulator ASB Date 

Hydraulic System No.1 A601R-29-029, Revision B (Note 1) 11 May 2010 

Inboard Brake A601R-32-103, Revision D (Note 2) 11 May 2010 

Outboard Brake A601R-32-103, Revision D (Note 2) 11 May 2010 

Notes: 

1. Inspection in accordance with Part B of the original issue, dated 18 October 

2007, or Revision A, dated 12 November 2009, of ASB A601R-29-029 also 

meets the intent of Part V, Paragraph B.1) of this directive. 

2. Inspection in accordance with Part B of the original issue, dated 21 November 

2006, Revision A, dated 7 March 2007, Revision B, dated 18 October 2007, or 

Revision C, dated 26 February 2009, of ASB A601R-32-103 also meets the 

intent of Part V, Paragraph B.1) of this directive. 

2) Inspect each accumulator in accordance with the Accomplishment Instructions in the 

applicable Bombardier Aerospace SB listed below, or later revisions approved by the 

Chief, Continuing Airworthiness, Transport Canada. 

Accumulator SB Date 

Hydraulic System No.1 601R-29-033, Revision A (Note 3) 11 May 2010 

Inboard Brake 601R-32-106, Revision A (Note 4) 11 May 2010 

Outboard Brake 601R-32-106, Revision A (Note 4) 11 May 2010 

Notes: 

1. Inspection in accordance with the original issue, dated 5 May 2009, of 

SB 601R-29-033 also meets the intent of Part V, Paragraph B.2) of this 

directive. 

2. Inspection in accordance with the original issue, dated 5 May 2009, of 

SB 601R-32-106 also meets the intent of Part V, Paragraph B.2) of this 

directive. 

3) If there is no indication of crack, no further action is required at this time. Refer to Part 

VI of this directive for future repeat ultrasonic inspection requirements. 

4) If there is an indication of a crack, replace the accumulator with a new accumulator, 

P/N 601R75138-1 (08-60163-001 or 08-60163-002) with letter “T” after the S/N on the 

identification plate, or accomplish Part VII of this directive, before further flight. 

Part VI: Repeat Ultrasonic Inspections of Hydraulic System No. 1, Inboard Brake and 

Outboard Brake Accumulators 

A. Inspection Schedule 

 For each accumulator without the letter “T” after the S/N on the identification plate, 

inspect the accumulator within 500 flight cycles after each previous ultrasonic inspection, 

in accordance with Part VI, Paragraph B of this directive. 

Note: Accomplishment of Part VI of this directive is not applicable for any accumulator that 

has letter “T” after the S/N on the identification plate or has already been replaced in 

accordance with Part VII of this directive. 

B. Inspection Procedures 

1) Inspect each accumulator in accordance with Part B of the Accomplishment 

Instructions in the applicable Bombardier Aerospace ASB listed below, or later 

revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 
No.

 N° CF-2010-24 4/4 

Accumulator SB Date 

Hydraulic System No.1 A601R-29-029, Revision B 11 May 2010 

Inboard Brake A601R-32-103, Revision D 11 May 2010 

Outboard Brake A601R-32-103, Revision D 11 May 2010 

2) Inspect each accumulator in accordance with the Accomplishment Instructions in the 

applicable Bombardier Aerospace SB listed below, or later revisions approved by the 

Chief, Continuing Airworthiness, Transport Canada. 

Accumulator SB Date 

Hydraulic System No.1 601R-29-033, Revision A 11 May 2010 

Inboard Brake 601R-32-106, Revision A 11 May 2010 

Outboard Brake 601R-32-106, Revision A 11 May 2010 

3) If there is no indication of a crack, no further action is required at this time. Refer to 

Part VI of this directive for future repeat ultrasonic inspection requirements. 

4) If there is an indication of a crack, replace the accumulator with a new accumulator, 

P/N 601R75138-1 (08-60163-001 or 08-60163-002) with letter “T” after the S/N on the 

identification plate, or accomplish Part VII of this directive, before further flight. 

Part VII: Replacement of Hydraulic System No. 1, Inboard Brake and Outboard Brake 

Accumulators

Within 4000 flight cycles or 24 months, whichever comes first, after the effective date of this 

directive: 

Replace each accumulator, P/N 601R75138-1 (08-60163-001 or 08-60163-002) with a new 

accumulator P/N 601R75139-1 (11093-4) in accordance with the Accomplishment 

Instructions in the applicable Bombardier Aerospace SB listed below, or later revisions 

approved by the Chief, Continuing Airworthiness, Transport Canada. 

Accumulator SB Date 

Hydraulic System No.1 601R-29-035 11 May 2010 

Inboard Brake 601R-32-107 11 May 2010 

Outboard Brake 601R-32-107 11 May 2010 

 

Authorization: For Minister of Transport, Infrastructure and Communities 

ORIGINAL SIGNED BY

Derek Ferguson 

Acting Chief, Continuing Airworthiness 

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

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