T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
All starts
Sg 14, fr 7
Engine Start Sequence
(2) GTS start button - PRESS MOMENTARILY
(a) Signals Start Control Unit to start the
GTS
(b) Applies Essential Services Bus power
to GTS fuel/oil-pump, GTS starter
motor, GTS igniters (through start
control unit), and engine igniters
(c) GTS unit starts and reaches idle speed
of 86% within 20 seconds
GTS advisory light illuminates
NOTE: Protection circuits within the
starting system will shut down the GTS
if idle speed is not achieved within 30
seconds after the GTS button is
pressed.
(3) Engine start switch - START
Sg 14, fr 9
Engine Start Sequence
(a) Spring-loaded detent initiates engine
starting sequence
(b) GTS accelerates to 100%, supplying
air to starter
(c) Air turbine starter (ATS) rotates N2
shaft
READY advisory light illuminates within
Sg 14, fr 10
Engine Start Sequence
15 seconds
(d) READY advisory light: Indicates that N1
shaft is rotating in correct direction with
shaft speed >100 rpm and that starting
sequence may continue
(9-98) Original
Page 27-141
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