TM 1-1520-238-T-7
10–22
Change 6
10–6.
CONTROLS AND INDICATORS (cont)
10–6
Table 10–1.
Fuel System Controls and Indicators
Pilot FUEL Panel
SWITCH/INDICATOR
POSITION
FUNCTION
ENG 1 switch
ON
Energizes engine 1 fuel crossfeed/shutoff valve.
OFF
De-energizes engine 1 fuel crossfeed/shutoff valve.
CROSSFEED switch
FWD TK
Enables both engines to receive fuel from forward fuel
cell.
NORM
Enables ENG 1 to feed from forward fuel cell. Enables
ENG 2 to feed from aft fuel cell.
AFT TK
Enables both engines to receive fuel from aft fuel cell.
ENG 2 switch
ON
Energizes engine 2 fuel crossfeed/shutoff valve.
OFF
De-energizes engine 2 fuel crossfeed/shutoff valve.
BOOST switch
ON
Enables pneumatically driven boost pump (in aft fuel cell)
to deliver fuel to both engine fuel crossfeed/shutoff
valves.
OFF
De-energizes boost pump.
TRANS switch
TO FWD
Transfers fuel from aft fuel cell to forward fuel cell via the
fuel transfer pump.
OFF
De-energizes fuel transfer pump.
TO AFT
Transfers fuel from forward fuel cell to aft fuel cell via the
fuel transfer pump.
EXT TK switch
ON
Energizes auxiliary fuel tank air and fuel shutoff valves
and routes pressurized air to external tanks for transfer of
fuel to internal fuel cells. When four external tanks are
installed, PAS air only pressurizes outboard tanks. Fuel is
forced from outboard tanks, through inboard tanks, and
into aircraft internal fuel cells.
OFF
De-energizes auxiliary fuel tank shutoff valves.
