AD NUMBER: PL2002-24-52
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive PL2002-24-52 SUMMARY: This document publishes in the
Federal Register an amendment adopting airworthiness directive (AD)
2002-24-52 that was sent previously to all known U.S. owners and
operators of all Boeing Model 747-400, -400D, and
-400F series airplanes by individual notices. This
AD continues to require revising the Airplane Flight Manual to
require the flightcrew to maintain certain minimum fuel levels in
the center fuel tanks, and to prohibit the use of the horizontal
stabilizer fuel tank. This AD also removes the reference to
placards that was specified in the operating limitations required
by another AD. This action is prompted by reports indicating that
two fuel pumps showed evidence of extreme localized overheating of
parts in the priming and vapor pump section of the fuel pump. Such
overheating provides an ignition source in the fuel tank during dry
running of the pump, which could result in fire/explosion of the
fuel tank. The actions specified by this AD are intended to require
the flightcrew to maintain certain minimum fuel levels in the
center fuel tanks, and to prohibit the use of the horizontal
stabilizer fuel tank.
AD NUMBER: PL2002-24-51
MANUFACTURER: Boeing
SUBJECT: Airworthiness Directive PL2002-24-51
SUMMARY: This document publishes in the Federal
Register an amendment adopting airworthiness directive (AD)
2002-24-51 that was sent previously to all known U.S. owners and
operators of the airplane models described previously by individual
notices. This AD requires revising the Airplane Flight Manual to
require the flightcrew to maintain certain minimum fuel levels in
the center fuel tanksand, for certain airplanes, to prohibit the
use of the horizontal stabilizer fuel tank and the certain center
auxiliary fuel tanks. This action is prompted by reports indicating
that two fuel tank pumps showed evidence of extreme localized
overheating of parts in the priming and vapor pump section of the
fuel pump; such overheating provides an ignition source in the fuel
tank during dry running of the pump, which could result in
fire/explosion of the fuel tank. The actions specified by this AD
are intended to require the flightcrew to maintain certain minimum
fuel levels in the center fuel tanks and, for certain airplanes
and, for certain airplanes to prohibit the use of the horizontal
stabilizer fuel tank and certain center auxiliary fuel tanks.
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