Fri, Apr 13, 2012
AD NUMBER: 2012-07-07
PRODUCT: All The Boeing Company Model 747 airplanes
SUBJECT: Airworthiness Directive 2012-07-07
ACTION: Final Rule
SUMMARY: This AD was prompted by reports of fractured latch pins found in service; investigation revealed that the cracking and subsequent fracture were initiated by fatigue and propagated by a combination of fatigue and stress corrosion.
This AD requires repetitive general visual inspections for broken or missing latch pins of the lower sills of the forward and aft lower lobe cargo doors; repetitive detailed inspections for cracking of the latch pins; and corrective actions if necessary.
The FAA is issuing this AD to detect and correct fractured or broken latch pins, which could result in a forward or aft lower lobe cargo door opening and detaching during flight, and consequent rapid decompression of the airplane.
DATES: This AD is effective May 15, 2012.
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