AD NUMBER: 2019-22-11

PRODUCT: Certain Bombardier, Inc., Model DHC-8-400 series airplanes.

ACTION: Final rule

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2009-09-02, which applied to certain Bombardier, Inc., Model DHC-8-400 series airplanes.

AD 2009-09-02 required repetitive inspections for damage of certain main landing gear (MLG) forward stabilizer brace assemblies, repetitive inspections for cracking of both MLG forward stabilizer braces, liquid penetrant inspections for cracking, and corrective actions if necessary.

This AD retains the existing actions and also requires installation of an elbow restrictor. This AD was prompted by reports of failures of the aft hinge of the MLG forward stabilizer brace due to fatigue cracks.

DATES: This AD is effective January 9, 2020.

COST: The FAA estimates that this AD affects 54 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

Retained actions from AD 2009-09-02

• 8 work-hours × $85 hour = $680 per airplane.

New actions

• Labor: 19 work-hours × $85 per hour = $1,615.
• Parts: $10,867.
• Total Cost per Airplane: $12,482.

FMI: AD