TM55-2840-251-23
Section X ENGINE TESTING (Continued )
1-94
GROUND TEST OF ENGINE
INSTALLED IN AIRCRAFT
(Cont)
8.c. (Cont)
(2)
Maximum Governing Speed: As on most
aircraft installations, either the propeller fine pitch setting
restricts the propeller speed (Np) at static conditions or the
travel of the maximum governor speed stop is limited,
making it impossible to check the overspeed setting.
However, if the govern- or maximum setting is suspected
of limiting engine power, it may be checked as follows:
(a)
Run engine to trim stop with
propeller in full fine pitch and record Ng. Shut down
engine.
(b)
Disconnect governor air pressure
tube 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 (1). Rerun engine to trim
stop and adjust power turbine governor maximum speed
adjustment (2) counter- clockwise in 1/8-turn increments
until Ng recorded in step (c) is obtained.
GO TO NEXT PAGE
1-153
