TM55-2840-251-23
Section X ENGINE TESTING (Continued)
1-95 GROUND TESTING OF ENGINE ON
MOBILE TRAILER ASSEMBLY
(AVIM) (Cont)
3.a. (Cont)
(7)
After approximately 5 seconds of
motoring or at a minimum sustained gas generator speed
(N1) of 7000 rpm (19%), advance fuel shut-off lever to idle.
(8)
Observe that engine ignites and
accelerates smoothly to idle. Note and record time to
ignite and time to idle.
CAUTION
Observe the ITT reading closely for a rapid
rise in temperature. If temperature is rising
rapidly when nearing 1600'F (870
°C), shut
down engine immediately to prevent over
temperature.
(9)
Engine starter and ignition switches off
position.
b.
Satisfactory start. A satisfactory start will be
insured providing all the following conditions are met:
(1)
Ignition takes place within ten seconds
after moving fuel cut-off lever to idle. Ignition will be
evidenced by a rise in turbine exhaust and interturbine
temperature.
NOTE
The ten-second time interval is an arbitrary
value. The actual ignition time may be less,
depending on the ambient temperature and
amount of torque supplied by starter.
(2)
Engine accelerates smoothly to idle.
(3)
Interturbine temperature does not
exceed maximum starting temperature during transition
period to idle (refer to Ground Operating Limits table,
following).
(4)
Oil pressure is at minimum (refer to
table).
CAUTION
Should the fuel cut-off lever be inadvertently
moved to cut-off position, do not reselect the
lever in an attempt to regain light up.
Introducing unburned fuel into the engine
creates a fire hazard; therefore, a fuel
draining period of at least 30 seconds must
be allowed and the complete starting
sequence repeated.
c.
Unsatisfactory Start. An unsatisfactory start will
occur if one or more of the following conditions takes
place:
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