I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 38
FOR SIMULATION USE ONLY – NOT A TRAINING AID
The fuel system includes the following on the EICAS to indicate fuel system
operations:
The red FUEL PX warning is activated by the low pressure switch and
indicates less than 10 psi fuel pressure in the motive flow/return flow supply
line.
The green BOOST PUMP advisory is illuminated manually by selecting the
BOOST PUMP switch ON, automatically by the low-pressure switch if the PCL
is above the IDLE position, or whenever the starter is activated regardless of
fuel pressure. The BOOST PUMP circuit breaker is located on the front
cockpit battery bus.
The amber L FUEL LO and R FUEL LO caution are activated by optical
sensors and indicate fuel quantity below approximately 110 pounds in the
respective wing tank. The optical sensors are independent of the fuel probes
and fuel quantity gages. The FUEL QTY LO circuit breaker is located on the
front cockpit battery bus.
The amber FUEL BAL caution illuminates if indicated fuel imbalance exceeds
30 pounds for 2 minutes, or a fuel probe fails. The FUEL BAL caution will
illuminate until the system is reset. To reset the auto balance system and 2-
minute timer, place the FUEL BAL switch to MAN/RESET, then return to AUTO
position. Resetting the auto balance system will not correct a fuel probe
failure.
The green M FUEL BAL advisory illuminates if the fuel balance switch is in
the MAN/RESET position. Selecting the MAN/RESET position enables the
manual fuel balance switch. Selecting L or R position stops motive flow fuel
from feeding from the respective tank. The FUEL BAL circuit breaker is
located on the front cockpit generator bus.
A pilot-selectable “BINGO, BINGO” audio alert sounds when the total fuel is
equal to or less than the value shown on the EICAS display at LSK L3. The
alert sounds continuously until a value lower than the fuel total is set via the
UFCP. The default value is 400 lbs.
The fuel quantity indicating system uses seven fuel probes: three in each wing tank
and one in the collector tank.
For example, if the tanks are full, the outer probe is providing the reading for fuel
quantity. The other probes are not used until the fuel level drops below the
outboard probe.
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