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|  MIL-C-52973A(ME)
4.5.2,5 High temperature.
4.5,2.5.1 Test procedure.
Subject the compressor unit to an ambient
temperature of plus 110 F, plus or minus 5 F until the fuel, and the engine
and compressor unit lubricating oil temperatures are stabilized.
Start and
operate the compressor unit at rated speed and capacity for not less than 8
hours while maintaining the 10 F plus or minus 5 F ambient temperature. NO
adjusting or replacing of engine or compressor components shall be permitted
after the first hour of operation.
4.5.2. 5.2 Test data.
Record the following data at 30 minute intervals:
a.
Ambient air temperature in test cell, 3 to 5 feet from the unit at
crankshaft level.
b.
Engine lubricating oil temperature (gallery).
Compressor lubricating oil temperature (sump).
c.
d.
Compressor discharge temperature (measured at inlet to final filter).
e.
Compressor air pressure at discharge.
Compressor capacity.
f.
4.5.2.5.3 Failure criteria.
Any one or more of the following shall
constitute failure of this test.
a.
Engine cylinder head temperature higher than the maximum specified 3.9.
b.
Engine lubricating oil temperature higher than the maximum specified in
3.9 for the lubrication system.
Compressor air discharge temperature higher than 135 F.
c.
d.
Compressor air delivery pressure less than 5000 psig.
Compressor discharge capacity less than 20 cfm.
e.
4.5.2.6
Low temperature.
4.5.2.6.1 Test procedure.
Subject the compressor unit to an ambient
temperature of minus 25 F plus or minus 5 F until the fuel, and the engine
compressor lubricating oil temperatures are stabilized.
Start and operate the
compressor unit at rated speed and capacity for not less then 4 hours while
Test data
maintaining the minus 25 F plus or minus 5 F ambient temperature.
shall be recorded as specified in 4.5.2.5.2.
4.5.2.6.2 Failure criteria. Any one or more of the following shall
constitute failure of this test.
a.
Inability of the compressor unit to start without the use of aids,
other than the engine priming system.
b.
Stabilized engine lubricating oil temperature not within the limits
specified in 3.9 with the engine operating.
Compressor air discharge temperature higher than 135 `F.
c.
Compressor air delivery pressure less than 5000 psig.
d.
Compressor discharge capacity less than 20 cfm.
e.
4.5.2.7
Precipitation.
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