Wed, Oct 17, 2007
AD NUMBER: 2007-21-13
SUBJECT: Airworthiness Directive 2007-21-13
SUMMARY: The FAA is
adopting a new airworthiness directive (AD) for certain Boeing
Model 747 and 767 airplanes.
This AD requires reworking the electrical bonding between the
airplane structure and the pump housing of the outboard boost pumps
in the main fuel tank of certain Boeing Model 747 airplanes, and
between the airplane structure and the pump housing of the
override/jettison pumps in the left and right wing center auxiliary
fuel tanks of certain Boeing model 767 airplanes.
This AD also requires related investigative actions and
corrective actions if necessary.
This AD results from fuel system reviews conducted by the
We are issuing this AD toprevent insufficient electrical
bonding, which could result in a potential of ignition sources
insidethe fuel tanks, and which, in combination with flammable fuel
vapors, could result in fuel tank explosions and consequent loss of
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