Unacceptable conditions during engine start

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T-45A UJPT, E2-C2, ADV, & IUT Eng-24

Engine Start Procedures

PROGRESS CHECK

Question 1 -- 1.4.1.1.2

What is the source of electrical power to the

engine igniters?

ANSWER: 28 VDC essential services bus

Question 2 -- 1.4.1.1.2

Explain the indications of the GTS and ROTATION

advisory lights.

ANSWER: The GTS light indicates that the gas

turbine starter has started and has reached its idle

speed of 86%. The ROTATION light indicates that

the engine N1 shaft is rotating in the correct direction

with a shaft speed > 100 rpm.

III. Unacceptable conditions during engine start

Sg 3, fr 1

1.5.3.1.2.3

Lesson Organization

EGT

High

Maximum starting: 550 degrees C;

maximum overshoot of 20 degrees C

for 10 seconds

Slowly climbing EGT with stagnated

rpm below 52% (hung start)

Any very rapid climb in EGT that

appears likely to exceed

550 degrees C (hot start)

NOTE: Wind blowing up the tailpipe,

extremely high ambient temperature,

and starting a hot engine may cause

higher than normal EGT indications.

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