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AMOC for FAA AD 2019-08-08 Challenger 604/601 Hydraulic System Accumulator

Challenger 604
Challenger 604

On May 31, 2024 the FAA issued an AMOC (Alternate Means of Compliance) based on Bombardier’s request to Transport Canada dated February 2024.

This AMOC was approved by the FAA to push compliance of the AD until June 30, 2028 subject to the following conditions:

1. This approval is applicable only to Bombardier, Inc. airplanes as specified under paragraph (c) of AD 2019-08-08.

2. Operators must order the repair kit referenced in the corresponding Service Bulletin (SB) by October 31, 2024.

3. This Global AMOC expires on June 30, 2028.

4. All provisions of AD 2019-08-08 that are not specifically referenced above remain fully applicable and must be complied with accordingly.

5. This global AMOC is transferable. A transferable global AMOC is a global AMOC that will continue to apply to a product after it has been transferred to a new owner/operator.

6. Before using this global AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/certificate holding district office.

7. This global AMOC only applies to the FAA AD listed above. The FAA does not have the authority to approve this as a global AMOC to any AD issued by another civil aviation authority

The FAA released AD 2019-08-08 for CL601/CL604 (and subsequent variants) effective on June 27, 2019 prompted by reports of on-ground hydraulic accumulator screw/end cap failure that resulted in loss of the associated hydraulic system and high-energy impact damage down range of adjacent systems and structure.

The terminating action of this AD is accomplished by c/w SB 601-0637 for CL601 aircraft (s/n 3001 to 3066, 5001 to 5194), or by c/w SB 604-29-013 R2 for CL604 aircraft (s/n 5301 to 5665).

These Service Bulletins remove the existing hydraulic system #3 accumulator and its pressure gauge/valve from the main landing gear bay and relocate them to the LH side, rear wing-to-fuselage fairing area of CL604’s or to the LH side of the aft belly fairing on CL601’s.

Compliance was mandatory within 60 months or 2,400 flight cycles (whichever occurs first) from the AD effective date of June 2019.

If aircraft do not have the LH hydraulic door previously installed, this must be accomplished at the same time as the accumulator relocation but will entail additional parts and labor. Smart Parts Plus does not pay for these kits to accomplish this modification.

West Star Aviation recommends performing these SB’s during the aircraft’s next 96-Month inspection while the aft lavatory or equipment/furnishings are removed.  For any questions related to this or any other Challenger maintenance issues, please contact any of the specialists listed below:

Robert Peyman

Robert Peyman

Technical Sales Manager
Challenger & Global
Tel 618.258.8090

Randy Miller

Randy Miller

Technical Sales Manager Challenger & Global
Tel 970.248.5270

Connor Mottice

Connor Mottice

Technician Sales Manager
Office 423.320.6156

Jeff Messmer

Jeff Messmer

Technical Sales Manager
Cell 314.607.4069

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Mark White

RSM, California

Dave Godo

RSM, Ohio Valley

Mark Daniels
Tim Cane
Robbie Johnson

RSM, Mid Atlantic

Santiago Carol

RSM, Latin America

Steve Fleeman

RSM, Landing Gear

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WSAA will be piloted at the East Alton, IL facility with the first round of apprentices anticipated to start in August 2024. For more information on West Star Aviation employment or WSAA apprentice selection criteria, please visit or contact Katie Johnson ( or Dave Lagermann (

Application & Selection Process

Before applying, please be aware of the standards of conduct for employment with West Star along with the strict requirements below while attending WSAA.

  • Working in Aviation requires a commit to being drug-free.  Pre-employment drug testing along with random and reasonable suspicion testing is required for all companies employing people working in safety sensitive positions. The position you are considering applying for is safety sensitive.  If hired, you must pass a DOT drug test to start working, if you fail the job offer is rescinded.  If you pass, you must remain drug-free during employment, failing a random or reasonable suspicion test may result in termination of employment.  Please note: marijuana is legal in certain states however the FAA follows Federal law where marijuana is illegal.  This means testing positive for marijuana, or any other illegal drug, will prevent you from working in Aviation. 
  • The first 7.5 months will follow a strict schedule: Monday – Friday 7:00am – 3:30pm (breaks and meal periods provided). 
  • The expectation is to arrive inside the learning center and clocked in at 7:00am.
  • While attending WSAA, no more than 4 hours a week can be missed.  Extenuating medical circumstances will be given full consideration with supporting documentation.
  • WSAA follows an FAA approved curriculum which has certain requirements including attendance. 
  • Testing for the FAA license at the conclusion of WSAA is required, along with passing.  Two opportunities to test will be provided, if needed.  Employment may terminate if the FAA license is not obtained.
  • Candidates will be contacted to complete pre-screening assessments and questionnaires. 
  • Qualified candidates will be contacted in late November and scheduled for a tour and interview with Hiring Managers at West Star Aviation in East Alton, IL.
  • To be qualified, candidates must pass the pre-screening process along with submitting a negative DOT drug test result.
  • Finalists will be selected after onsite interviews. Job offers will be extended in mid-December with a start date of January 9, 2024.
  • Pay while learning in the Academy will be $20 per hour.  Upon successfully graduating and obtaining your FAA license, pay will increase to $27 per hour.