Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 767 airplanes. This proposed AD would require installing an automatic shutoff system for the auxiliary fuel tank pump, revising the airplane flight manual (AFM) to advise the flight crew of certain operating restrictions for airplanes equipped with an automatic auxiliary fuel tank pump shutoff control, revising the Airworthiness Limitations (AWLs) section of certain maintenance documents to include new inspections of the automatic shutoff system for the auxiliary fuel tank boost pumps, and, for certain airplanes, installing a placard to alert the flight crew of certain fuel usage restrictions. This proposed AD results from a design review of the fuel tank systems. We are proposing this AD to prevent an overheat condition outside the pump explosion-resistance area that is open to the pump inlet, which could cause an ignition source for the fuel vapors in the fuel tank and result in fuel tank explosions and consequent loss of the airplane.