TM 55-2840-254-23
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1-107 TEST ENGINE (AVIM) (Continued)
f. Check vibration meter, using 200 Hz filter, for indications from all transducers and that vibration is
within limits given below.
Velocity (Iniches/Second)
Position
0.94
Water Brake*
Front Vertical
0.63
0.84
Rear Vertical
Axial
0.94
*For indication of water brake condition only. Do not reject
engine if this position exceeds limit.
g. 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.
i. If gearbox pressure is over 5 psi or rear bearing scavenge oil temperature indication is high, shut down
engine (Paragraph 21) and check No. 2 bearing package for seal leakage (Ref. Task 1-87).
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