TM55-2840-251-23
Section X ENGINE TESTING (Continued )
1-95
GROUND TESTING OF ENGINE ON
MOBILE TRAILER ASSEMBLY
(AVIM) (Cont)
2. (Cont)
c.
Inspect run-up area in vicinity of trailer and
remove any loose objects particularly lockwire which
might be ingested by the engine. Insure all covers are
removed.
d.
Inspect engine and test stand interconnect
linkage for security, directional movement and full travel
of controls.
e.
Check all lines for security.
f.
Check level in engine oil tank (Section VIII).
Carry out engine motoring run as follows:
(1)
Position DC switch to ON. Fuel shut-off
lever to cut-off position.
(2)
Ignition switch to off position and test
stand master switch to on position.
(3)
Test stand fuel system and fuel booster
pump switch to on position.
(4)
Engine starter switch to on position and
motor engine until a gas generator speed of
approximately 7000 rpm (19%) is attained, then open fuel
shut-off lever for 10 seconds duration.
(5)
Check for oil pressure indications,
evidence of fuel and oil leaks and leakage (if any) from
fuel dump valve and gas generator case drain valves
(closed). For permissible leakage refer to following table.
Engine Oil and Fuel Permissible Leakage
Location of
Maximum Leakage During
Drain Line
Engine Operation
Fuel Pump
0.5 cc/min.
Dump Valve
0.2 cc/min.
Starter Cavity
3 cc/hr.
Gas Generator Case (2)
Nil
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