T-45A UJPT, E2-C2, ADV, & IUT Eng-24
Engine Start Procedures
SUMMARY
Sg 4, fr 1
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The IGNITION switch controls 28 VDC essential services
on each throttle grip. The ENGINE switches control
28 VDC essential services power to the start control unit
and provide the start-engine signal. The forward and aft
cockpit ENGINE 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 energized. The engine
igniters are also activated while the GTS button is
depressed. When the ENGINE 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
activated by ECA.
Monitor EGT 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.
CONCLUSION
Properly following the checklist procedures during engine
start and recognizing the significance of cockpit
indications will significantly increase engine life.
Page 24-20
(8-03) Original
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