TM55-2840-251-23
Section X ENGINE TESTING (Continued)
1-95
GROUND TESTING OF ENGINE ON MOBILE
TRAILER ASSEMBLY (AVIM) (Cont)
7.b.(1) (Cont)
(a) Run engine to trim stop with
propeller in full fine pitch and record Ng. Shut down
engine.
(b) Disconnect governor air pressure
tube (5) from power turbine governor and install
blanking plug in tube.
(c) Rerun engine to trim stop and
insure Ng has not increased. Shut down engine. Record
Ng obtained.
(d) If Ng has increased, remove
blanking plug and reconnect tube (5). Rerun engine to
trim stop and adjust power turbine governor maximum
speed adjustment (6) counterclockwise in 1/8-turn
increments until Ng recorded in step (c) is obtained.
c. Compressor Bleed Valve.
Unsatisfactory part power and performance checks may
indicate compressor bleed valve malfunction. For
malfunction symptoms, refer to Section VII,
Troubleshooting.
CAUTION
Adjustments to compressor bleed valve are only
carried out at overhaul under controlled
conditions.
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