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|  MIL-T-62531(AT)
APPENDIX A
converter. The coolant system shall include a de-aeration system of sufficient capacity to handle
the coolant drawn down as required by the engine manufacturer or a coolant recovery reservoir
of not less than 5% of the total coolant system capacity. A high cooling system temperature
warning light or buzzer shall be provided. The reservoir shall be located in a position readily
accessible for inspection and service.
Lessons Learned
4.4.5.7 Cooling system test. To determine conformance to 3.4.5.7, the cooling system shall
be examined to assure that the system meets the specified cooling requirement. The maximum
values of transmission oil temperature, engine coolant temperature and engine oil temperature
and pressure shall be recorded during high ambient temperature and instrument tests conducted
at GPG.
Verification Rationale
The cooling system must be of adequate capacity to preclude the engine and transmission
temperatures from exceeding the specified high temperature limits. Excessive high temperatures
will result in inadequate performance and premature engine and transmission failures.
Verification Guidance
Record the temperatures of the engine coolant and the transmission oil during high ambient
temperature operation at GPG. Temperatures in excess of the maximum temperatures specified
should be considered as a potential problem. The cause should be identified and corrected.
Verification Lessons Learned
3.4.6 Exhaust system. The exhaust system shall be of leakproof construction, securely
mounted and shall withstand vehicle racking. Material for exhaust system, including those used
for muffler and tailpipe, shall be of corrosion resistant steel. Exhaust pipe shall be secured to the
exhaust manifold with a quick disconnect design feature. Design of pipe shall be such that it
shall not interfere with power unit removal.
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