AD NUMBER: 2018-22-04

PRODUCT: Certain Boeing Model 787-8 and 787-9 airplanes.

ACTION: Final Rule.

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2017-01-02, which applied to the airplanes listed above.

AD 2017-01-02 required an inspection for discrepant inboard and outboard trailing edge flap rotary actuators, and replacing the rotary actuator or doing related investigative and corrective actions if necessary.

This AD continues to retain those actions. This AD also adds airplanes to the applicability and reduces the number of affected actuators.

This AD was prompted by a report indicating that some inboard and outboard trailing edge flap rotary actuators may have been assembled with an incorrect no-back brake rotorstator stack sequence during manufacturing.

DATES: This AD is effective November 28, 2018.

COST: The FAA estimates that this AD affects 89 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

• Inspection 5 work-hours × $85 per hour = $425.
• On-Condition Costs
• Check to determine flight cycles on the rotary actuator 1 work-hour × $85 per rotary actuator.
• Functional Test per rotary actuator 2 work-hours × $85 per hour = $170 per rotary actuator.
• Replacement per rotary actuator 2 work-hours × $85 per hour = $170 per rotary actuator.
• System Test after rotary actuator replacement(s) per airplane 24 work-hours × $85 per hour = $2,040  per airplane.

FMI: AD