T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
XII. Engine start procedures
Fig 33: Engine
Controls (Forward
Cockpit)
A.
Controls and indicators
1.
Summary
The IGNITION switch controls 28 VDC essential
services power to the engine igniter relays and GTS
start buttons on each throttle grip. The ENGINE
start switches control 28 VDC essential services
power to the start control unit and provide the start-
main-engine signal. The forward and aft cockpit
ENGINE start switches are connected in series, and
both must be set to ON to start the engine.
Momentarily pressing the GTS start button causes
the gas turbine starter to start and accelerate to idle
speed and the ignition relay circuitry to be ener-
gized. The engine igniters are also activated while
the GTS button is depressed. When the engine
start switch is set to START, the GTS accelerates to
full power and the start valve is open to allow the
GTS to supply low pressure air to the ATS which
ECA
Monitor TGT and rpm gauges during engine start for
indications of abnormal operation. No rise in EGT
within 15 seconds after introducing fuel is an
indication of a wet start. Stagnated rpm below 52%
and slowly rising EGT indicate a hung start. A rapid
increase in EGT that appears likely to exceed the
maximum (550 degrees C) is an indication of a hot
start. Starting a hot engine can also result in a
higher than normal EGT. Heavy generator or
hydraulic loading, an open bleed valve, or high bleed
air demands can reduce rpm to below normal
Abnormal fuel flow indications normally accompany
high or low rpm/EGT indications. If abnormal fuel
flow is indicated, check the other engine instruments
to aid you in determining the problem. The normal
idle fuel flow range is 300-400 pph
(9-98) Original
Page 27-136
Previous Page
