FORWARD FUEL CELL FLAPPER VALVE REPLACEMENT continued
Jet fuel will cause external surface of fuel
cell to swell, delaminate, and leak if al-
lowed to contact the fuel cell more than
72 HOURS. Keep jet fuel away from the
outside of fuel cells.
a. Remove flapper valve (1) from forward fuel
The forward fuel cell contains two
identical flapper valves. This proce-
dure can be used for either valve.
Flapper valves with elastic stop nuts
do not use washers.
(1) Hold four bolts (3). Remove four nuts (4) and
washers (5) from valve (1) and backing plate
(2) Remove four bolts (3).
(3) Remove valve (1) and plate (6) from forward
fuel cell (2).
a. Wipe valve mounting area and removed and
attaching parts with a clean rag.
a. Check valve mounting area for cracks, tears,
blistering, or separation. Check attaching parts
for damage (para 10.1).
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