5F-10 Developed for Training Purposes Citation Bravo
March 2009
CAE SimuFlite
Advancing the throttle to 10% and
above actuates the cutoff switch to
the open position and shows that the
corresponding indicating system is
operational. The fuel flow indicating
system also provides electrical
power and signals to the flight man-
agement system.
Low Level Warning
The low level warning system func-
tions independently of the normal
quantity indicating system and
causes an amber LO FUEL LEVEL
L/R annunciator to illuminate when
usable fuel remaining in either tank
is approximately 190 lbs (+/- 15 lbs)
or less. The system is calibrated to
give an accurate indication in level
unaccelerated flight. A float switch
in each wing provides a signal to its
respective LO FUEL LEVEL annun-
ciator. As fuel quantity in either fuel
cell decreases below approximately
190
lbs, the float switch closes the
circuit to its associated light. When
operating with light fuel loads, it is
possible for the lights to illuminate
momentarily if the aircraft encoun-
ters turbulence, rough runway or taxi
surfaces, or during turning. The low
fuel warning lights can be operation-
ally tested by selecting ANNU on
the annunciator TEST selector
switch, and dimmed in the same
manner as the annunciator panel.
Fuel Low Pressure
Switch
The fuel low pressure switch is con-
nected to a microswitch on the
engine pylon firewall. The pressure
switch provides two functions: mon-
itoring fuel pressure to the engine-
driven pump and illuminating the
LO FUEL PRESS L/R annunciator
if the pressure decreases below 4.65
PSI (+0.15, -0.25 PSI). It also oper-
ates the fuel boost pump.
In a low pressure situation, the pres-
sure switch relay supplies power to
the boost pump relay. Activation of
the boost pump is semi-automatic.
The boost pump switch must be in
NORMAL and the respective throt-
tle must be out of CUTOFF for the
pressure switch to activate the boost
pump. When the boost pump comes
on, the FUEL BOOST L/R annunci-
ator illuminates. As pressure rises
above 4.65 PSI, the boost pump
remains on and the LO FUEL
PRESS L/R annunciator extin-
guishes. To turn off the boost pump,
turn OFF the boost pump switch.
Returning the switch to NORMAL
rearms the system.
Filler Assembly
A flush-mounted fuel filler assembly
is on the upper surface of each wing
near the outboard end for normal
fuel servicing.
The filler assembly consists of an
adapter, standpipe (to allow for fuel
expansion), cap, and a chain to
attach the cap to the adapter
(Figure
5F-5)
. The fuel tank full level of
each wing is controlled by the loca-
tion of the filler cap and standpipe.
Fuel will flow out of the filler cap
once the tank is full, thus assuring
the expansion space can-not be filled
with fuel. Flush-fitting handles fit
inside the recessed cap, which has
markings to indicate open and closed
positions.
Remove the cap by lifting the handle
and rotating it counterclockwise. To
install the cap, reverse the proce-
dure. An optional locking fuel filler
cap is interchangeable with the origi-
nal. The locking cap has a chrome
cover to protect the lock from
weather.
Unusable Fuel Limitation
Fuel remaining in the fuel tanks
when the fuel quantity indicator
reads zero is not usable in flight.
To Next Page