Airworthiness Directive · Amendment 39-13931 · Boeing Model 747-100 and -200B Series Airplanes
Boeing Model 747-100 and -200B Series Airplanes
This AD applies to Boeing Model 747-100 and -200B series airplanes having line numbers 1 through 167 inclusive, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-100 and -200B series airplanes. This AD requires installing bonding clips and bonding jumpers from the housing of each fuel pump to airplane structure outside the fuel tanks. This AD is prompted by the results of fuel system reviews conducted by the manufacturer. We are issuing this AD to ensure adequate electrical bonding between the housing of each fuel pump and airplane structure outside the fuel tanks. Inadequate electrical bonding, in the event of a lightning strike or pump electrical fault, could cause electrical arcing and ignition of fuel vapor in the wing fuel tank, which could result in a fuel tank explosion.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 60 months after the effective date of this AD, install bonding clips and bonding jumpers from the housing of each fuel pump to airplane structure located outside the fuel tanks by doing all of the actions in part 1 of the Accomplishment Instructions of Boeing Alert Service Bulletin 747-28A2033, Revision 1, dated December 18, 2003.
Installations done before the effective date of this AD in accordance with Boeing Service Bulletin 747-28-2033, dated December 15, 1971, are acceptable for compliance with the requirements of this AD.
