AD NUMBER: 2018-26-03

PRODUCT: All Boeing Model 757-200 series airplanes.

ACTION: Final Rule.

SUMMARY: This AD was prompted by reports of uncommanded movement of the captain's and first officer's seats.

This AD requires, for the captain's and first officer's seats, repetitive horizontal actuator identifications, repetitive checks of the horizontal movement system (HMS), a detailed inspection of the HMS, as applicable, and applicable on-condition actions.

This AD also requires a general visual inspection to determine the seat part numbers of the captain's and first officer's seats, a cable adjustment check on seats with certain seat part numbers, and applicable on-condition actions.

DATES: This AD is effective January 31, 2019.

COST: The FAA estimates that this AD affects 17 airplanes of U.S. registry.  Operators may incur the following costs in order to comply with this AD:

• Identification/Check: Up to 11 work-hours × $85 per hour = $935 per aircraft per identification/check cycle. Parts: Up to $4,820. Cost per airplane: Up to $5,755 per identification/check cycle.

FMI: AD