Must Now Be Inspected After 8,000 Total Flights

The FAA is ordering U.S. operators of 138 Boeing 767 airplanes to reduce the initial pylon inspection time mandated in a September 22, 2005 AD from 10,000 to 8,000 total flights. This inspection must be done within 400 flights after the most recent inspection required by the 2005 directive, or within 90 days, whichever occurs later.

The FAA is also reducing the interval for repetitive inspections for cracking of the pylon midspar structural fittings and an adjacent structure from 1,500 to every 400 flights thereafter. There is also an option for replacing the fittings instead of conducting the inspections.

Since the 2005 Airworthiness Directive (AD), the FAA has received two reports of cracking of the midspar structural fitting on Boeing 767 pylons. The pylon attaches the engine to the wing. Undetected cracking could lead to fracture of the structural components, damage to the pylon, and separation of the engine from the wing.

The Immediately Adopted AD affects 138 U.S.-registered airplanes out of 314 worldwide. The total cost to U.S. operators is approximately $46,920. The AD affects only those 767 models that have the original pylon design. Boeing has improved the design of the 767 pylon and those aircraft with the improved pylon designs are not included in this AD.

FMI: www.ofr.gov/OFRUpload/OFRData/2010-17611_PI.pdf