5L-18
Developed for Training Purposes
Citation Bravo
March 2009
CAE SimuFlite
engine start; and the Secondary
Manifold, which opens during the
start sequence at 27 to 28% N
2
to
supply idle fuel flow (to finish the
start sequence) and engine operating
fuel flow for flight. The divider
valve also controls fuel pressure to
both manifolds, dumps fuel from the
manifolds during engine shutdown,
and ensures that fuel does not reach
the manifolds until the divider
senses a minimum required fuel
pressure.
During engine start, the flow divider
valve provides fuel only to the pri-
mary manifold; any excess fuel is
routed back to the fuel pump inlet. As
engine speed increases toward idle,
the divider valve begins supplying
fuel to the secondary manifold until
both the primary and secondary man-
ifolds receive the same fuel flow.
A manually operated shutoff lever
on the flow divider valve allows
maintenance personnel to shut off
FCU fuel flow to the manifolds.
With the shutoff lever closed, the
shutoff and windmill bypass valve
routes fuel back to the fuel pump.
Motive Flow Valve
A motive flow valve releases,
returning the excess fuel to the fuel
tanks. The returning high pressure
fuel operates a wing sump primary
ejector fuel pump. The ejector fuel
pump supplies high volume low
pressure fuel (20 to 25 PSI) to the
engine during normal operation.
Fuel Manifold Assembly
The fuel manifold assembly delivers
fuel from the flow divider valve to
the primary and secondary passages
of the fuel nozzles. The manifold
consists of 11 dual-orifice (primary
and secondary) adapter assemblies
connected by transfer tubes.
Each of the 11 adapter assemblies
contains a dual-orifice fuel nozzle
with a swirl-type tip and a sheath
(Figure 5L-8).
Each fuel nozzle pro-
vides a finely atomized spray of fuel
into the combustion chamber. Com-
pressor discharge air flowing around
the sheath assists in fuel atomization
and nozzle cooling.
Emergency Fuel Shutoff
The mechanical emergency fuel
shutoff system shuts off the fuel
flow to the engine to prevent major
damage from occurring during an
engine malfunction. The system
consists of a mechanical linkage
between the No. 4 bearing housing
and the fuel inlet and shutoff valve
assembly on the fuel manifold.
NOZZLE
SHEATH
ADAPTER
NOZZLE
SLEEVE
PRIMARY
PASSAGE
SECONDARY
PASSAGE
STARTING FUEL FLOW
MAXIMUM FUEL FLOW
COMPRESSOR
DISCHARGE AIR
5L-8
Summary of Contents for Citation Bravo
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Page 225: ...Maneuvers Citation Bravo For Training Purposes Only 3D 31 October 2013 Rejected Takeoff ...
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