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Refer to Chapter 8—“Fire Protection” for
more information on the firewall shutoff valves
and their operation.
Fuel Pressure Switches
Pressure switches are in the engine fuel supply
lines adjacent to each engine. The switches
deactivate at 6.4 psig (maximum) and reactivate
when the engine fuel supply pressure
drops below 4.65 psig. When fuel pressure
drops below this limit, the amber FUEL PRES
LO L-R message appears.
Fuel Flow Transmitter
A fuel flow transmitter is on each engine fuel
supply line. The transmitter sends a 0-5 volt analog
signal to the G1000 system, which translates
the signal to pounds/kilograms per hour.
CONTROLS AND INDICATIONS
The pilot controls the fuel system with the L
and R FUEL BOOST switches and the FUEL
TRANSFER selector. Fuel indications are displayed
on the MFD in the EICAS window,
which is displayed in two columns on the left
side. In the event of MFD failure or revision,
the EICAS section is shown in a single-column
format on whichever displays are in reversionary
mode.
FUEL BOOST Switches
The FUEL BOOST switches are on the lower
instrument tilt panel (Figure 5-8). Each switch
(L and R) has three positions: ON, OFF, and
NORM.
The switches manually control the respective
boost pumps in the ON and OFF positions. In
the NORM position, boost pump operation is
automatically controlled.
Figure 5-8. Fuel Controls
FUEL TRANSFER Selector
A FUEL TRANSFER selector (Figure 5-8) on
the lower left instrument tilt panel controls the
(normally closed) fuel transfer valve.
The selector has three positions: L TANK,
OFF, and R TANK.
The selector opens the fuel transfer valve and
energizes the supply side fuel boost pump,
which allows fuel to be pumped to the selected
engine feed bay from the opposite engine
feed bay.
Fuel is transferred at approximately 10 ppm
(4.5 kg per minute). Rate varies with engine(s)
fuel flow.
Fuel Quantity Indication
The aircraft has a passive capacitance-type
fuel quantity system. The system consists of:
• Independent dual-channel digital signal
conditioner (in the left aft wing fairing)
• Five fuel probes in each wing tank
• EICAS displays
Fuel quantity is displayed on the G1000 GDU
1500 MFD “AUX” page and in the left EICAS
column of the MFD (Figure 5-9). Quantity
can be displayed in either pounds or kilograms.
Fuel tank levels are displayed with a
white pointer on a white scale on the fuel display
and by green digits just below the scale.
In reversionary mode, only the digits are displayed
(Figure 5-10).
Total aircraft fuel is the sum of the fuel quantities
displayed for each tank. This value is displayed
below the individual tank quantities in
green digits. Total fuel quantity is displayed
in the same units as the fuel tank levels. Invalid
data is displayed by a red X or white dashes.
Fuel Temperature Indication
The fuel temperature probe is inside the left
side engine feed bay. The probe temperature
appears in the fuel display. Fuel tank temperature
is displayed as green digits (in °C) below
the fuel flow (see Figure 5-9). If invalid data
is received, a red X is displayed. The temperature
displayed is invalid if below –70°C
(–94°F) or above 99°C (210°F).
Fuel Flow Indication
Fuel flow is displayed digitally below the
total fuel display. The digits are green and are
displayed in pounds per hour (PPH) or kilograms
per hour (KGH). Invalid data displays
as a red X.
CITATION MUSTANG OPERATING MANUAL
510OM-00 5-7
Figure 5-9. Fuel Display in MFD
(EICAS Normal Mode)
Figure 5-10. Alternate Fuel Display
(EICAS Reversionary Mode)
CAS Messages
F/W SHUTOFF L-R
The engine fire-warning and fire-extinguishing
systems allow the crew to detect and suppress
fires in the aircraft engine compartments. When
the red L–R ENGINE FIRE lights are pressed,
the appropriate fuel shutoff valve closes and the
amber F/W SHUTOFF L or R message appears
on the EICAS (Figure 5-11). This message may
also appear after engine shutdown if the normal
engine shutdown valve fails.
FUEL FLTR BP L-R
If the fuel filter becomes clogged, the bypass
valve allows unfiltered fuel to enter the engines.
Before the bypass valve is opened, a signal
is sent to the EICAS system to indicate an
impending bypass, which displays the amber
FUEL FLTR BP L-R message (Figure 5-11).
Refer to the Chapter 7—“Powerplant” for
　
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