TM 55-2840-254-23
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1-107 TEST ENGINE (AVIM) (Continued)
p. Set fuel specific gravity K factor on readout.
q. Check engine for external leaks. If leakage exceeds limits, stop test and repair engine, as required, to
prevent leakage.
(1) Oil leakage shall not exceed 2 cc per hour per seal.
(2) Total fuel leakage, or fuel oil leakage from fuel control seal, shall not exceed 120 cc per hour
maximum from all seals.
(3) Total fuel leakage from fuel boost pump seal shall not exceed 30 cc per hour.
4.GROUND IDLE CHECK
a. Move power turbine master hydronic control to maximum position.
b. Check that N1 speed is 60 to 63 percent at 10 to 15 degrees N1 hydronic control position.
NOTE
Do not adjust ground idle speed until after maximum power trim has been set.
c. Oil pump discharge pressure shall be 60 to 80 psig (reference), as oil temperature becomes stabilized.
In following step, pressure fluctuation of more than 5 psig is not acceptable. Damage
to engine may result.
d. Check that rear bearings oil feed pressure is 25 psig minimum.
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