Engine and Related Systems
T-45C TS, ADV & IUT ENG-04
(2) GTS fuel obtained from aircraft fuel system
downstream from LP fuel shutoff valve
(3) Started by pressing GTS start button
Overlay 4
GTS Start Button
(a) When GTS reaches speed, a green
Overlay 5
GTS advisory light illuminates in both
GTS Advisory Lights
cockpits and GTS starter motor
disengages
(b) Dump valve routes excess GTS air
Overlay 6
overboard
Dump Valve
(c) GTS accelerates to 100% for engine
Overlay 7
starting when ENGINE start switch is
Engine Start Switch
momentarily set to START
(4) When engine start switch is momentarily
Overlay 8
set to START, the GTS accelerates, the
Start Valve
start valve is opened, the dump valve
closes and the GTS supplies compressed
air to the engine ATS
(5) Shuts down after engine reaches 45% rpm
b.
ATS: air turbine starter output shaft drives
Overlay 9
Air Starter
NOTE: The starting system does not feed
air into the engine.
(1) Sprag clutch allows engine to overrun ATS
upon engine start
c.
Start control unit
Overlay 10
(1) Sequences start cycle by monitoring
Starter Control Unit
speeds of GTS, air turbine starter, and
engine
(2) Electrically off-loads DC generator and
HYD 2 system until engine N2 rpm reaches
45% to ease strain on ATS
Original (9-98)
Page 4-16
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