T-45A UJPT, E2-C2, ADV, & IUT Eng-02
Engine
(2) Fuel-cooled oil cooler (FCOC):
Overlay 2
mounted on engine accessory
FCOC
package, heat exchanger unit
transfers oil heat to fuel, reducing
or eliminating fuel system icing
(3) Filter: removes foreign matter
Overlay 3
from fuel (resin-impregnated
Filter
paper)
Overlay 4
HP Fuel Pump
(4) HP fuel pump: mounted on and
driven by external gearbox,
supplies HP fuel to fuel control
unit (FCU) and SIFCU
(a) Maintains constant fuel
pressure throughout engine
Overlay 5
speed range
(5) FCU: fuel flow scheduling unit
with acceleration control and
altitude and airspeed
compensation
LECTURE NOTES
FCU
Explain characteristics of engine surge margin.
Explain how the initial shot solenoid affects engine
surge margin.
INITIAL SHOT SOLENOID
When the engine is accelerated, the first act of the
throttle valve assembly is movement of the inner
plunger; this provides an increase in fuel flow by
uncovering the initial shot port.
Fuel is supplied to the initial shot port from a solenoid
valve mounted on the engine cambox. This facilitates
the increase in fuel flow to the engine to be varied
according to flight conditions.
(8-03) Original
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