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FUEL LVL LO L-R
The amber FUEL LVL LO L-R message indicates
that fuel level is low in the indicated wing
tank. Each signal conditioner channel sends
an ARINC discrete signal (low fuel level warning)
to the EICAS system when the respective
wing usable fuel quantity is less than approximately
170 pounds (25 gallons) (Figure 5-11).
FUEL LO INOP L-R
The white FUEL LO INOP L-R message indicates
the amber FUEL LVL LO L-R message
is not operational and cannot provide reliable
indication of low fuel level.
In some situations, if the fuel quantity gauging
system fails (indicated by a red X on either
fuel quantity EICAS display), there may
still be sufficient reliable data for the system
to determine whether or not fuel level is
below 170 pounds (25 gallons). In this situation,
the FUEL LVL LO L-R message is
still useable as a minimum indication of fuel
level (appearing only when fuel level is below
170 pounds in either tank). However, if there
is not sufficient reliable data to determine that
fuel level is above or below 170 pounds, the
FUEL LO INOP L-R message appears, indicating
which tank cannot supply valid data to
control the FUEL LVL LO L-R message.
FUEL PRES LO L-R
When the fuel-supply pressure to an engine
drops below the activation point, its pressure
switch closes. The fuel pressure switch completes
an electrical circuit, which displays the
respective amber FUEL PRES LO L-R message.
If the boost switch(es) is in the NORM position,
the boost pump(s) automatically energizes.
FUEL TRANSFER
The FUEL TRANSFER selector, when in the
L TANK or R TANK position, completes an
electrical circuit that automatically energizes
the electric fuel boost pump in the opposite
tank and opens the fuel transfer valve. This activates
the white FUEL TRANSFER message
and either the L or R FUEL BOOST white
CAS message, assuming the boost switches are
in the NORM position.
FUEL BOOST L-R
The FUEL BOOST L-R message is present
anytime the boost pumps are on. The message
is usually white.
CITATION MUSTANG OPERATING MANUAL
5-8 510OM-00
CAS
F/W SHUTOFF L-R
FUEL FLTR BP L-R
FUEL LVL LO L-R
FUEL PRES LO L-R
FUEL BOOST L
FUEL BOOST R
FUEL LO INOP
FUEL TRANSFER
Figure 5-11. CAS Messages
The white FUEL BOOST L-R message appears
when the pilot commands the fuel boost
pump on (by selecting the FUEL TRANSFER
selector to L TANK or R TANK, by selecting
either FUEL BOOST switch to ON, or by
pressing a start button).
The amber FUEL BOOST L-R message appears
when the corresponding fuel boost pump
is energized automatically in response to low
fuel pressure. This is only possible when either
FUEL BOOST switch is selected to
NORM.
ENGINE FIRE Light
In the event of an engine fire, the fire detector
in the engine compartment illuminates the
red L or R ENGINE FIRE light (Figure 5-12).
Pushing the light (which has an integral pushbutton
switch) closes the corresponding firewall
shutoff valve, which shuts off the fuel flow
to the engine and illuminates the amber F/W
SHUTOFF L-R message. For details, refer to
Chapter 8—“Fire Protection.”
OPERATION
Normal Operation
During normal operation of the fuel system,
the L and R FUEL BOOST pump switches are
in the NORM position. In this position, each
boost pump operates automatically:
• During engine start—White FUEL
BOOST L-R message appears.
• During fuel transfer operation—White
FUEL TRANSFER and white FUEL
BOOST L-R messages appear.
• When low fuel pressure is sensed in the
engine fuel supply line—An amber
FUEL PRES LO L-R message appears
for a moment, followed quickly by an
amber FUEL BOOST L-R message. As
the boost pump quickly increases the
fuel pressure, the amber FUEL PRES
LO L-R message extinguishes quickly;
it may not even be seen by the pilot.
If the throttle is OFF, the boost pumps do not
energize automatically in a low fuel pressure
condition, even though the boost pump switch
is in the NORM position. When the switch is
OFF, the boost pump does not operate. In the
ON position, the pump operates continuously.
With the L and R FUEL BOOST pump
switches in the NORM position, pressing an
ENGINE START button energizes the corresponding
fuel boost pump. This moves fuel
from the wing tank engine feed bay on that side
through the firewall shutoff valve to the enginedriven
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