MIL-DTL-38195D
4.6.9.1 Endurance. The generator set shall be subjected to and shall pass an endurance test of not less than 1,000
hours of operation at the prevailing sea level atmospheric condition. Sufficient readings shall be recorded at least
every 30 minutes and before each change of operation condition. The endurance test shall consist of two phase, each
phase using a different fuel, as follows:
a.
Using grade JP-8 fuel conforming to MIL-DTL-5624, at least 250 starts and 95 test cycles shall be
accomplished. Electrical loads shall be instantaneously applied and removed. One test cycle shall
consist as specified in Table VIII (see 3.5.1.2).
4.6.9.2 Post-endurance operation. Immediately following the endurance test, the tests specified in 4.4.1.2.6 and
4.4.1.2.7 shall be repeated. The generator set shall then be subjected to a disassembly inspection in accordance with
(IAW) 4.6.9.4.
4.6.9.3 Start-stop test. One generator set shall be subjected to 500 cycles of operation. Each cycle shall consist
of the following:
Time Period
(Minutes)
Load or Condition
Full normal air load
1
Idle or no load
2
Full normal air load
1
Non-rotating
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4.6.9.3.1 Acceleration. The unit shall be accelerated automatically from test to full speed at no load. The unit
shall be fully loaded within 10 seconds of attaining full speed. The stop switch shall he actuated within 5 seconds
after the final full load of each cycle is complete.
4.6.9.3.2 Test limits. The 250 starts completed in the endurance test specified in 4.6.9.1 shall be credited to
completion of 250 cycles of this test if the same generator set is used. Loading and unloading shall be accomplished
with a pressure regulating and shutoff valve conforming to MIL-V-38398. The pressure regulation sensing line shall
be disconnected during the test. Time for acceleration and deceleration shall not be credited to this test. Pneumatic
output shall be directed through a starter valve to a converging nozzle which is designed for 125 CFM of air at 70
psia and 325° F. Matched pressure in accordance with (IAW) the generator set rating for the particular ambient
shall be maintained until maximum limits of speed and temperature have been reached. The test shall be continued
to completion at these limits and a record of the best obtainable matched pressure shall be maintained.
4.6.9.4 Disassembly inspection. Following the test specified in 4.6.9.2, the generator set shall he disassembled
to the maximum practicable extent. Parts shall be inspected, photographed, and measured to disclose failure,
distortion, excessive wear, weakness, and other unsatisfactory conditions. Compressor impeller and turbine rotor
parts shall be subjected to visual, sonic, and fluorescent penetrant inspection. Indication of fracture in the material as
a result of test shall be cause for rejection.
4.7 Inspection comparison. The Government Quality Representative at the contractor's facility may select
sample sets at any time during the contract production period and subject these sets to any examination and test
specified herein, necessary to determine that the selected sets meet all requirements of this specification. The
inspection will be performed by the government at a site selected by the Government. Sets will be selected at
random from those, which have been accepted by the Government and will not include the previously inspected first
article and initial production sets. Acceptance of an inspection comparison set shall not exclude the remaining sets
from the quality conformance inspection and acceptance provisions specified in Section 4. In addition to any test
specified as a part of the inspection comparison, the Government reserves the right to conduct any and all other tests
contained in this specification as part of the inspection comparison and failure of such additional tests shall have the
same effect as failure of those tests specified as inspection comparison.
4.7.1 Inspection failure. Failure of an inspection comparison set to meet any requirement specified herein during
and as a result of the examination and tests specified in 4.7 shall be cause for rejection of the inspection comparison
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