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|  MIL-T-62531(AT)
APPENDIX A
3.4.5.2 Engine governor. Engine governor shall be provided and set to limit engine speed to
not more than ______ rpm, no load. The governor shall be sealed to provide indication of
tampering.
Rationale
With the engine operating in a no load status and the throttle in a wide open position, the
tachometer shall not exceed the RPM specified. RPM in excess of that specified may cause
serious damage to the engine.
Guidance
Insert the required RPM data. Engine governor speed shall be checked during the production
performance run, and subsequent installation in a vehicle.
Lessons Learned
4.4.5.2 Engine governor test. To determine conformance to 3.4.5.2, the engine shall be
started and operated without load, with foot accelerator depressed to the maximum permissible
position and the engine speed not exceeding ____ rpm. The governor shall be examined to
assure that it is properly sealed.
Verification Rationale
The engine governor must restrict the RPM as specified in case of an inadvertant wide open
runway of the engine. Excessive RPM(s) will cause the engine to self destruct.
Verification Guidance
With the engine warmed up to its normal operating temperature and the transmission in
neutral position, depress the foot accelerator to its maximum position and observe the tachometer
RPM.
Verification Lessons Learned
3.4.5.3 Fuel. The engine shall be capable of full performance consuming fuel in accordance
with DF-2 of VV-F-800.
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