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4.10.6. The pilot need only occasionally monitor the AUX-ILIARY FUEL MANAGEMENT panel to ensure that during AUTO MODE of fuel transfer, fuel in external tanks is decreasing as it should. The second mode of trans-fer is the MANUAL XFR (secondary) mode. In the MANUAL mode the pilot may replenish main tank fuel in any quantity or frequency desired. Transfer must be initi-ated by the pilot. The pilot must constantly monitor the fuel quantity indicator in order to start and terminate transfer to remain within CG limits. It is possible to transfer fuel from any one tank while in MANUAL mode. Transfer is shut off by the pilot when the external tank low-level sensor signals that the tank is empty. During manual transfer, at the illu-mination of a tank EMPTY light, immediately switch from OUTBD to INBD or to manual transfer MODE OFF.Do not wait for the NO FLOW light to illuminate. This will preclude air from entering the fuel line and entering the main tank. At the illumination of the TANK EMPTY cap-sule, 2.5 to 4.0 gallons of fuel remain in the tank. Sloshing of the fuel will cause frequent illumination of the TANK EMPTY, NO FLOW, and AUX FUEL lights when the tank is in this condition.
4.10.2 External Extended Range Fuel System Tanks. External extended range system contains two or four tanks suspended from supports outboard of the fuse-lage. The tanks contain baffles to prevent fuel sloshing. Quick-disconnect valves are provided in external fuel and bleed-air lines to provide seals when tanks are jettisoned or removed. If tanks are not installed cccc will be displayed in the AUX FUEL QTY POUNDS display when OUTBD or INBD is selected on the rotary fuel quantity selector. The preferred location of the External Extended Range Fuel System (External ERFS) auxiliary fuel tank is the outboard pylon. This facilitates ingress and egress of troops and loading of cargo.
4.10.3 Auxiliary Fuel Management Control Panel.
The AUXILIARY FUEL MANAGEMENT control panel (Figure 4-18) contains all controls for operating the exter-
nal extended range fuel system. Controls description is as follows:
CONTROL/ FUNCTION
INDICATOR
FUEL XFR Controls fuel management of
external extended range system.
CONTROL/ INDICATOR
PRESS
OUTBD ON
OFF
INBD ON
OFF TANKS INBD TANKS OUTBD
MODE
AUTO
OFF
MANUAL
MANUAL XFR
RIGHT ON
OFF
FUNCTION
Opens bleed-air valves to outboard tanks for pressurization.
Closes bleed-air valves to tanks.
Not used.
Closes bleed-air valves to tanks.
Not used.
Selects fuel transfer valves from outboard tanks for fuel transfer to main tanks; deselects inboard valves.
Selects AUTO-OFF-MANUAL mode of fuel transfer from external fuel tanks.
Automatically transfers fuel to main tanks from selected external tanks, until empty sensor in each tank interrupts transfer. Transfer occurs in levels as shown under fuel transfer sequence. When tanks are empty, NO FLOW and EMPTY indicators and AUX FUEL caution light will be turned on.
Interrupts automatic or manual transfer mode of operation.
Provides electrical path to MANUAL XFR switch(es), which allows transfer from selected tank(s) until switch is moved to off.
Transfers from right tank used in conjunction with MODE switch in MANUAL position of the pair selected by TANKS select switch.
Interrupts transfer operation.
4-40 Change 4
CONTROL/ FUNCTION
INDICATOR
LEFT ON Transfers from left tank of the pair
selected by TANKS select switch.
OFF Interrupts transfer operation.
AUX FUEL QTY Indicates pounds of external fuel
POUNDS remaining in symmetrical pair of
tanks total of auxiliary tanks, self-
test indication or failure codes.
Displays K factors of .ow meter.
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