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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) 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 ma y 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) 1/4 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 adjac ent systems and struct ure. The lowest number of flight cycles accu mulated 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) [Hyd raulic 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 tr ajectory of a failed screw cap/end cap for each of the accumulators has been conducted, result ing in the identification of several areas where systems and/or struct ural components could potentia lly be damaged. Although all of the failures to date have occurred on the gr ound, an in-flight failure affecting such components could potentially have an adverse effe ct on the controllability of the aeroplane.

This directive gives instructions to amend t he 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 Sy stem No. 1, Inboard Brake and Outboard Brake

accumulators that are not ident ified by the letter “T” after the serial number (S/N) on the identification plate for cra cks until they are replaced by new accumulators P/N 601R75139-1 (11093-4).

Corrective

Actions: Part I: AFM Change

Within 30 days after the effect ive 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 t he changes introduced in the AFM TR.

Part II: Deactivation of the Hydr aulic System No. 3 Accumulator

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

Deactivate the Hydraulic System No. 3 accumu lator, 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 m eets the intent of Part II of this

directive.

2. Accomplishment of Part II of this dire ctive is not applicable if the accumulator has already been removed in accordance wi th 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 applicabl e 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 accumula tor, in accordance with the Accomplishment Instructions in Bombardier Aerospace Serv ice 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 Bombardi er 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 applicabl e 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 t he accumulator before it has accumulated 5000 flight cycles, in accordance with Pa rt V, Paragraph B of this directive.

3) If it is not possible to determine the fli ght 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 t he effective date of this direct ive, in accordance with Part V, Paragraph B of this directive.

Note: Accomplishment of Part V of this direct ive is not applicable for any accumulator that
has letter “T” after the S/N on the identific ation 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, Conti nuing 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, Par agraph 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, Re vision 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 wi th the Accomplishment Instructions in the applicable Bombardier Aerospace SB listed bel ow, 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 cycl es after each previous ultrasonic inspection, in accordance with Part VI, Paragraph B of this directive.

Note: Accomplishment of Part VI of this dire ctive is not applicable for any accumulator that
has letter “T” after the S/N on the identific ation 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, Conti nuing 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 wi th the Accomplishment Instructions in the applicable Bombardier Aerospace SB listed bel ow, 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 furt her 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 Ae rospace 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, In frastructure 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.