T-45C TS, ADV & IUT ENG-26
Engine Start Procedures
Sg 6, fr 2
SUMMARY
Review Options
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 accel-
erate 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
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.
CONCLUSION
Properly following the checklist procedures during engine start
and recognizing the significance of cockpit indications will
significantly increase engine life.
(9-98) Change 3
Page 26-21
Previous Page
