MIL-PRF-62541A
4.5.3.7.1 Temperature. Inlet air temperatures shall not be less than 70°F or more than
100°F unless otherwise specified (see 4.5.3.7.6). The lubricating oil temperature shall not exceed
230°F at the sump.
4.5.3.7.2 Fuel. During the 400 hr endurance test, diesel fuel conforming to MIL-F-46162
shall be used.
4.5.3.7.3 Power check. Full rack characteristics of the engine shall be measured
according to the following schedule before the endurance test and after each 100 hr operating
period:
Period
Engine speed (rpm)
Rack position
Full rack
1800
1
Full rack
2000
2
Full rack
2400
3
Full rack
2600
4
Full rack
2800
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4.5.3.7.4 Acceptable 400 hr endurance performance. During the 400 hr test, the engine
shall be observed for compliance with the following performance requirements during power
check tests. The power checks shall be made at the beginning of the endurance run and at the end
of each 100 hr period.
a.
Idle speed
3.4.3
b.
Governed speeds
3.4.4
c.
Torque
3.4.5.1
d.
Brake horsepower
3.4.5.2
e.
Fuel consumption
3.4.5.3
f.
Exhaust smoke density
3.4.6
g.
Oil consumption
3.4.7
h.
Oil pressure
3.4.8
4.5.3.7.5 Servicing. Prior to each power check test, the lubricating oil shall be changed,
all filters serviced, and valve clearances and injector rack settings checked and adjusted to
applicable requirements.
4.5.3.7.6 High temperature. The last 100 hr of the 400 hr endurance test shall be
conducted with the air inlet temperature not greater than 125 + 5°F, in accordance with 3.4.10.b.
The power check tests shall be made at room temperature (see 3.4.5).
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