.+. Transport

Canada

Transports

Canada

TP 7245E

No. CF.2010-24 I 1/4

Issue Date

3 August 2010

AIRWORTHINESS DIRECTIVE

Number: CF-2010-24

Subject: Hydraulic Accumulators - Screw CapfEnd Cap Failure

Effective: 18August2010

Applicability: Bombardier Inc, Model Cl-600-2819, Serial Numbers 7003 and subsequent

Compliance: As indicated in Parts I through VII below, uhles5 already accomplished.

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

experienced on CL-600-2819 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 dale, has been 6991 flight

cycles.

The part numbers (PIN) of the accumulators currently installed on CL-60o-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 andlor 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 Srake and Outboard Brake

accumulators that are not identified by the letter "r after the serial number (SIN) on the

identification plate for cracks until they are replaced by new accumulators PIN 601 R75139-1

(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 11:Deactivation of the Hydraulic System No.3 Accumulator

VVithin250 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 (ASS)

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

Continuing Airworthiness, Transport Canada.

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Notes:

1 Deacitivation in accordance with Part A of the original issue of ASB

A601,R-29-031, dated 23 December 200B, 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 dale of this directive:

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

Instructions in Bombardier Aerospace Service Bulletin (S8) 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 S8 601 R-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 ASS A601 R-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 ASS A601 R-29-031,

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

2. The instructions in AFM TR INo. RJ/186, dated 16 December 2008, or later

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

IV of this directive. I

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 SIN 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 SIN 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 thb flight cycles accumulated for any accumulator

without the letter 'T after the SIN dn 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 d(rective is not applicable for any accumulator that

has letter "T" after the SIN on the identification plate or has already been replaced in

accordance with Part Vli 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 a'pproved by the Chief, Continuing Airworthiness, Transport Canada,

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

200e, 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 58 Date

H draulic S stem NO.1 601 R-29-033, Revision A Note 3 11 Ma 2010

Inboard Brake e01 R-32-1 oe, Revision A Note 4 11 Mav2010

Outboard Brake 601R·32-10e, Revision A Note 4 11 Mav2010

Notes:

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

SB e01R-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

S8 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 l)ltrasonic inspection requirements.

4) If there is an indication of a crack, ~eplace the ~ccumulator with a new accumulator,

PIN 601 R75138-1 (08·60163~001 or 08-60163~002) with letter T' after the SIN 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 SIN on the identification plate,

inspect the accumulator within 500 ffight 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 SIN 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 Ilsted below, or later

revisions approved by the Chief, Cohtinuing Airworthiness, Transport Canada,
I

No, CF·2010~24 '0

Accumulator 58 Date

H draullc S stem No.1 A601 R-29·029, Revision B 11 Ma 2010

Inboard Brake A6Q1R'·32-103, Revision D 11 Mav2010

Outboard Brake A601R~32-103, Revision D 11 Mav2010

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

applicable Bombardier Aerospace $8 listed below, or later revisions approved by the

Chief, Continuing Airworthiness, Tra'nsport Canada.

Accumulator 58 Date

Hvdraulic System NO.1 601 R-29-033, Revision A 11 May 2010

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

Outboard Brake 601 R-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 rep,eat ultrasonic inspection requirements.

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

PIN 601 R75138-1 (08-60163-001 or 08-60163-002) with letter T' after the SIN on the

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

Part VII: Replacement of Hydraulic Sys~em 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, PIN 601R75138-1 (08-60163-001 or 08-60163-002) with a new

accumulator PIN 601R75139~1 (11093-4) in accordance with the Accomplishment

Instructions in the applicable Bombardier Aerospace 58 listed below, or later revisions

approved by the Chief, Continuing AirwortHiness, Transport Canada.

Accumulator 58 Date

Hydraulic System No.1 601 R-29-035 11 May2010

Inboard Brake 601:R-32-107 11 May 2010

Outboard Brake 601R-32-1 07 11 May2010

Authorization: For Minister of Transport, Infrastructure and Communities

OR1GIR-\L SIGNED 8\-'

Contact:

Derek Ferguson

Acting Chief, Continuing Airworthiness

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

613-996-9178 or e-mail CAWWEBFeedback@tcgc.caoranyTransportCanadaCentre.