AD NUMBER: 2019-08-08

PRODUCT: Certain Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-600-2B16 (601- 3A, 601-3R, and 604 Variants) airplanes.

ACTION: Final Rule.

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2010-14-05, which applied to the aircraft listed above.

AD 2010-14-05 required inspection for the part numbers of the system and brake accumulators, and repetitive replacement of affected accumulators.

This AD adds requirements for relocating the accumulators and revising the existing maintenance or inspection program to incorporate new or more restrictive airworthiness limitations.

This AD also adds optional terminating action for certain airplanes.

This AD was prompted by reports of on-ground hydraulic accumulator screw cap or end cap failure that resulted in the loss of the associated hydraulic system and high-energy impact damage to adjacent systems and structure.

DATES: This AD is effective June 27, 2019.

COST: The FAA estimates that this AD affects 130 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

• Retained actions: 20 work-hours × $85 per hour = $1,700. Parts: $7,717. Cost per airplane: $9,417.
• New actions: Up to 170 work-hours × $85 per hour = Up to $14,450. Parts: Up to $41,635. Cost per airplane: Up to $56,085.

FMI: AD