Engine and Related Systems
T-45C TS, ADV & IUT ENG-04
(3) Filter: removes foreign matter from fuel
Overlay 3
Filter
(4) HP fuel pump: mounted on and driven by
Overlay 4
external gearbox, supplies HP fuel to fuel
HP Fuel Pump
control unit (FCU) and SIFCU
(a) Maintains constant fuel pressure
throughout engine speed fluctuations
(5) FCU: fuel flow scheduling unit with
Overlay 5
acceleration control and altitude and
FCU
airspeed compensation
LESSON NOTES
Explain characteristics of engine surge margin. Explain how the
initial shot solenoid affects engine surge margin.
(a) Initial shot solenoid provides increased
fuel flow to increase engine surge
margin during engine acceleration
i)
Enabled when altitude decreases
through 7,700 +/- 500 feet
ii)
Disabled when altitude increases
through 9,500 +/- 300 feet
(b) Acceleration switch dampens throttle
Overlay 6
valve response for rapid throttle
Acceleration Switch
movements
(c) Servo pressure control maintains
Overlay 7
constant pressure drop across throttle
Servo Pressure Control
valve, compensating for changes in
airspeed and altitude
Original (9-98)
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