# .+. Transport Canada Transports

Canada TP 7245E

No. CF.2010-24 

# I 1/4 Issue Date 3August 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 Ithrough 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) ofthe 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 or08-60164-002) {Hydraulic System NO.3 accumulator]. A detailed analysis ofthe calculated line oftrajectory of afailed 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 onthe controllability ofthe 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 30days afterthe effective date ofthis directive:

, A. Amend the AFM, CSP A-012, by inserting Temporary Revision (TR) No_RJ/186, dated 16 December 2008, orlaterapproved changes tothisTR. Advise all flightcrews ofthe changes introduced intheAFM TR.

Part 11:Deactivation of the Hydraulic System No.3 Accumulator VVithin250flight cycles afterthe effective date ofthis 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 bythe Chief, Continuing Airworthiness, Transport Canada.

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# I~· CF-2010·24 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 ofthis directive. 2. Accomplishment of Part II of this directive is not applicable if the accumulator has already been removed in accordance with Part IVofthis directive, 3, The instructions in AFM TR No. RJ/186, dated 16 December 2008, or later approved changes to thisTR, are applicable following accomplishment of Part II ofthis directive.

Part III: Removal of the Hydraulic System No.2 Accumulator Within 500 flight cycles afterthe effective dale ofthis 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 12November 2009, also meetsthe intent of Part IIIofthis directive.

Part IV: Removal of the Hydraulic System No.3 Accumulator Within 1000flight cycles afterthe effective date ofthis 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 ofthe original issue of ASS A601 R-29-031,

dated 23 December 2008, also meets the intent of Part IVofthis 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 IVofthis directive. I
Part v: Initial Ultrasonic Inspections of Hydraulic System No.1, Inboard Brake and

Outboard Brake Accumulators A. Inspection Schedule 1) Foreach accumulator without the letter''T"afterthe SIN on the identification plate and with more than 4500 flight cycles, inspect the accumulator within 500 flight cycles afterthe effective date ofthis directive, inaccordance with PartV, Paragraph Bofthis directive. 2) Foreach accumulator without the letter 'T afterthe SIN on the identification plate and with 4500 or less flight cycles, inspect the accumulator before it has accumulated 5000flight cycles, in accordance with PartV, Paragraph Bofthis directive. 3) If it is not possible to determine thb flight cycles accumulated for any accumulator without the letter 'T afterthe SIN dn the identification plate, inspect the accumulator within 500flight cycles afterthe effective date ofthis directive, in accordance with Part V, Paragraph Bofthis directive. Note: Accomplishment of Part V of this d(rective is not applicable for any accumulator that has letter "T" afterthe SIN on the identification plate or has already been replaced in accordance with PartVli ofthis 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 bythe 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) ofthis 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 PartV, Paragraph B,1}ofthis directive. 2) Inspect each accumulator in accordance with the Accomplishment Instructions in the applicable Bombardier Aerospace SB listed below, or later revisions approved bythe 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-32-1oe, Revision A Note4 11 Mav2010 Outboard Brake 601R·32-10e, Revision A Note4 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) Ifthere is no indication ofcrack, nofurther action is required atthis time. Refer to Part VI ofthis directive forfuture repeat l)ltrasonic inspection requirements. 4) Ifthere is an indication of a crack, ~eplacethe ~ccumulator with a new accumulator, PIN 601 R75138-1 (08·60163~001 or08-60163~002) with letter T' afterthe SIN on the identification plate, oraccomplish PartVII ofthis 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 500ffight cycles after each previous ultrasonic inspection, inaccordance with PartVI, Paragraph Bofthis directive. Note: Accomplishment of PartVI 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 PartVII ofthis 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 bythe Chief, Cohtinuing Airworthiness, Transport Canada,

# I No, 

### CF·2010~24 

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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'nsportCanada. 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) Ifthere is no indication of a crack, no further action is required at this time. Refer to PartVI ofthis directive forfuture rep,eatultrasonic inspection requirements. 4) Ifthere 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' afterthe SIN on the identification plate, or accomplish PartVII ofthis directive, before further flight.

Part VII: Replacement of Hydraulic Sys~em No.1, Inboard Brake and Outboard Brake

Accumulators Within 4000 flight cycles or24 months, whichever comes first, after the effective date ofthis 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 bythe 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 May2010 Outboard Brake 601R-32-107 11 May2010 Authorization: For Minister ofTransport, 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 ore-mail CAWWEBFeedback@tcgc.caoranyTransportCanadaCentre.