AD NUMBER: 2019-22-01

PRODUCT: Certain The Boeing Company Model 787-8 airplanes.

ACTION: Final rule

SUMMARY:  This AD was prompted by a report of an escapement from the wing spar terminal fitting supplier indicating that the engineering requirements provided by Boeing for controlling machine mismatch were incorrect for part faying surfaces, which can result in a reduced fatigue capability at the interface of the side of body (SOB) rib.

This AD requires repetitive inspections for fatigue cracking and applicable on-condition actions for the SOB rib webs where fastener locations attach the terminal fittings.

DATES: This AD is effective December 17, 2019.

COST: The FAA estimates that this AD affects 1 airplane of U.S. registry. Operators may incur the following costs in order to comply with this AD:

• Inspection: Up to 32 work-hours × $85 per hour = Up to $2,720 per inspection cycle.
• Parts: $960.
• Cost per aircraft: Up to $3,680 per inspection cycle.

According to the manufacturer, some or all of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected individuals.

The FAA does not control warranty coverage for affected individuals. As a result, the FAA has included all known costs in its cost estimate.

FMI: AD