TM55-2840-251-23
Section X ENGINE TESTING (Continued)
1-94
GROUND TEST OF ENGINE
INSTALLED IN AIRCRAFT
(Cont)
8.
(Cont)
b.
Propeller Feathering Check. If the propeller
constant speed/governor unit (airframe supplied) has been
changed, carry out propeller feathering check as follows:
(1)
Perform pre-start check (subparagraph
2).
(2)
Accomplish satisfactory engine start
(subparagraph 3).
(3)
Allow engine to warm up to operating
temperature, and engine instruments to stabilize at idle
rpm.
(4)
Feather propeller two or three times to
purge all air from system.
(5)
With power control lever at HI-IDLE,
move propeller control lever to feathering position. A
considerable reduction in power turbine speed should be
observed indicating that satisfactory feathering of propeller
has been accomplished.
(6)
Return propeller control lever to the
INCREASED position and observe that propeller shaft
speed is regained.
NOTE
Parts removed to gain access to other parts or
areas shall invoke the same penal- ties as parts
removed to correct deficiencies and malfunctions
(refer to pre- ceding table). If more than one
penalty is invoked, the most severe shall apply.
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