AD NUMBER: 2018-11-14

PRODUCT: Certain The Boeing Company Model 767-300 and -300F series airplanes.

ACTION: Final Rule.

SUMMARY:  This AD was prompted by reports of fatigue cracking on airplanes with Aviation Partners Boeing winglets installed.

This AD requires high frequency eddy current (HFEC) inspections for cracking of the lower outboard wing skin, and repair or modification if necessary.

This AD also requires one of three follow-on actions: Repeating the HFEC inspections, modifying certain internal stringers and oversizing and plugging the existing fastener holes of the lower wing, or modifying the external doubler/tripler and doing repetitive post-modification inspections.

DATES: This AD is effective July 10, 2018.

COST: The FAA estimates that this AD affects 140 airplanes of U.S. registry. The costs of compliance are estimated as follows:

• HFEC Inspections - $510 per aircraft for 6 hours labor.
• Post-repair Inspections - $510 per aircraft for 6 hours labor.
• Repair/Modification - $22,270 per aircraft for 262 hours labor.

FMI: AD