TM55-2840-251-23
Section X ENGINE TESTING (Continued)
1-95
GROUND TESTING OF ENGINE ON MOBILE
TRAILER ASSEMBLY (AVIM) (Cont)
8. Idle Speed Adjustments
a.
General. Since the gas generator
speed at minimum fuel flow varies with the barometric
pressure (as shown on graph) the engine will either
govern at the idle speed setting or run on the minimum
fuel flow stop, depending on the barometric pressure.
Moreover, in the barometric pressure range from 26.26
in. Hg. to 28.65 in. Hg., since Ng at minimum fuel flow
may be anywhere between the limits shown on graph, it
must first be determined whether the engine is
governing at idle speed or running on minimum fuel
flow before the idle speed adjustments can be checked.
Consequently, the procedure for checking the idle
speed adjustment depends on the barometric pressure.
b.
Barometric Pressure above 28.65 in.
Hg. At barometric pressure above 28.65 in. Hg., check
idle speed as follows:
(1) Perform pre-start check
(subparagraph 2).
(2) Accomplish satisfactory start
(subparagraph 3).
(3) Allow engine to warm up to
operating temperature and instruments to stabilize.
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