Challenger 604 | 605 | 650 Operators: Eliminate Repeat Inspections On Lower Shock Strut To Trailing Arm Pins

February 1st, 2023

If you operate a Challenger 604, 605 or 650, you should be aware that Bombardier has released SB604-32-031, SB605-32-008 and SB650-32-005 which will eliminate the requirement of repeat inspections of the lower shock strut to trailing arm pins in the main landing gear system for potential cracks.

Why Was This SB Issued?
Inspection reports indicated that the lower shock strut to trailing arm pins can develop cracks at the anti-rotation tangs. This potential had previously required repeated inspection of the pins to check for damage.

What Does This SB Do?
The service bulletin outlines the replacement of trailing arm bushings and improved dynamic joint components. Once the SB is complied with, this will eliminate the need for repetitive inspection required under TCCA Airworthiness Directive CF-2020-54R1 and FAA AD 2021-20-13 (pending).

What Aircraft Does This Apply To?
Effectively applies to all CL600-2B16 aircraft within the following serial number ranges:

CL604 s/n 5301 to 5665
CL605 s/n 5701 to 5988
CL650 s/n 6050 to 6188

When Should I Have This SB Done?
It is recommended that this Service Bulletin be addressed in conjunction with the operators 48/96/192-month inspections. Planning for this Service Bulletin during these scheduled events can help ensure the needed parts kits are available and on hand. Lead times on the required parts kits from OEM can be up to 10 days or longer in some instances, so we recommend planning ahead.

Compliance
Compliance is recommended within 5 years of the SB release date of 12/2022 and suggested to be accomplished during the aircraft’s next scheduled 48M, 96M or 192M inspection.

Please contact your Bombardier Technical Sales Manager to provide pricing and to get the parts on order prior to the aircraft’s next scheduled maintenance event.