TM55-2840-251-23
Section X ENGINE TESTING (Continued)
1-94
GROUND TEST OF ENGINE
INSTALLED IN AIRCRAFT
(Cont)
9.c.
(Cont)
(4)
With propeller in fine pitch and oil
temperature at 100'F (38'C)
minimum, observe and record
Ng at idle speed.
(5)
Disconnect Py sense tube between FCU
and power turbine governor at the FCU, and check if Ng
drops from the value recorded in subparagraph c.(4).
Reconnect Py sense tube.
NOTE
During this check the engine will not respond to
power control lever movement. Leave the
controls in the Lo-idle position.
CAUTION
Carry out this check with zero power
extraction. Should the minimum fuel flow
stop be adjusted too low, an excessive drop
in Ng will result and the operator must be
prepared to shut down the engine if
necessary.
(6) If Ng, with Py sense tube disconnected,
was less than Ng recorded in subparagraph c.(4), then
engine was governing at the idle speed setting and the idle
speed may be adjusted in accordance with subparagraph
b.(5).
GO TO NEXT PAGE
1-159
