Table 2-1. Pilot Fuel Control Panel Switch Functions

TM 1-1520-238-10 2-36 Table 2-1. Pilot Fuel Control Panel Switch Functions Switch Position Result Indication ENG 1 set OFF Energizes fuel crossfeed/shutoff valve of the No. 1 engine to the closed position thus shutting off fuel flow to that engine. None ENG 1 set ON Energizes fuel crossfeed/shutoff valve of the No. 1 engine to the position commanded by the CROSSFEED switch. None ENG 2 set OFF Energizes fuel crossfeed/shutoff valve of the No. 2 engine to the closed position, thus shutting off fuel flow to that engine. None ENG 2 set ON Energizes fuel crossfeed/shutoff valve of the No. 2 engine to the position commanded by the CROSSFEED switch. None CROSSFEED set FWD TK Both engines feed from the forward fuel cell. FWD cell fuel quantity indicators register fuel decrease while AFT cell indicators remain constant. CROSSFEED set NORM ENG No. 1 feeds from the forward fuel cell; ENG No. 2 feeds from the aft fuel cell. Both fuel quantity indicators register fuel decrease from consumption. CROSSFEED set AFT TK Both engines feed from the aft fuel cell. AFT cell fuel quantity indicators register fuel decrease while FWD cell indicators remain constant. EXT TK switch set ON Pressurized air is made available to all external tanks for transfer of fuel to the main fuel cells. Both fuel quantity indicators register fuel increase during fuel transfer operation. TRANS set TO FWD Fuel is being pumped from AFT cell to FWD cell by the transfer pump. AFT cell fuel quantity indicators register fuel decrease while FWD cell indicators register fuel increase. TRANS set TO AFT Fuel is being pumped from FWD cell to AFT cell by the transfer pump. FWD cell fuel quantity indicators register fuel decrease while AFT cell indicators register fuel increase. BOOST set ON Pneumatically driven boost pump (in AFT cell) is delivering fuel to both engine CROSSFEED/ SHUTOFF VALVES. BOOST PUMP ON segment of C/W panel illuminates. (Crossfeed must be set to AFT TK in order to latch BOOST switch.)