Fuel low level light indicators (3). Check to test
operation; press and test the four lights. Low level light
will illuminate when fuel quantity in each tank is
approximately one minute from being empty, Figure 2-
The override switch (4) overrides the fuel
pressure switches, Figure 2-23.
System circuit breakers (5) will trip if indicator
lights, pumps, or override switch malfunctions. All
circuit breakers must be pushed in prior to system
operation, Figure 2-23.
Turn pump switch (2) ON and hold until pump
engages, Figure 2-23.
OPERATION. The ERFS system is an auxiliary
fuel system designed to supplement the aircraft
standard fuel system. Refer to Figure 2-24 and the
following procedure for operating procedures.
· In order to maintain aircraft CG,
suggested tank burn sequence is 4, 1, 3,
· After aircraft ground checks but prior to
flight, ensure positive fuel flow from
ERFS to aircraft fuel system.
Initiate fuel transfer when the aircraft's main fuel
tanks have decreased 1000 pounds or sooner. The
ERFS is designed as an automatic system. Once fuel
transfer is initiated, the pumps can be turned on and
simply monitored. One fuel pump per side is enough to
meet the demands of the aircraft. Two pumps per side
are installed for redundancy and for faster fuel transfer if
Ensure tank cam lever for selected tank is open.
c. Turn all pump switches (3) (four each) ON,
Figures 2-22, 2-23, and 2-24.
Do not use liquid level indicator for
continuous fuel quantity readings during
flight. Use only as necessary. Lock in
place after use.
Transfer fuel until low level warning lights (5)
come on, Figure 2-22.
Preferred method of operation is to turn
all pumps ON during fuel transfer. Allow
at least 10 second delay between each
pump switch actuation.
TURN-OFF PROCEDURES. Turn-off system
operation as follows:
Turn all pump switches (3) (four each) OFF,
b. Close cam lever (8), Figure 2-21.