T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
engine starting sequence to ensure safe
starting and to prevent engine damage.
a.
EGT indications during starting phases
(1) Rises rapidly to approximately
300-350 degrees C
(2) Rate of rise should slow above
350 degrees C
(3) Normal starting EGT peaks at
approximately 400-450 degrees C
NOTE: Maximum EGT should not
exceed 550 degrees C (570 degrees
with a 10-second overshoot).
b.
RPM climbs rapidly toward, and should
Overlay 6
RPM Indications
reach, 52% within 30 seconds of IDLE
selection
NOTE: If 45% N2 rpm is not attained
within 45 seconds from release of the
start switch, the GTS will return to idle.
c.
Fuel flow slowly rises with rpm to idle
flow of 300-400 pph
d.
At starter cut-out speed (45% rpm)
(1) Start control unit shuts down GTS
and GTS and ROTATION advisory
lights extinguish
(2) Engine ignition units deenergize
e.
During ground starts, the
GENERATOR warning light will
extinguish when a suitable DC output
is obtained (25 to 25.2 VDC at
approximately 42% rpm); this may
occur as high as 61% rpm due to weak
permanent magnets in the generator
Page 26-91
(8-03) Original
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