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Dielectric strength
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Starter-Generator Engine STU-6A
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High temperature



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MIL-S-26547C
4.6.14  Efficiency-generator.  The generator shall be subjected to the
operating conditions specified in Table V.  The efficiency of the generator
shall be determined at rated terminal voltage, and the speed and load con-
ditions tabulated in Table V.  The efficiency shall be not less than 60 per
(See 3.7.13)
cent under any of the conditions specified.
Endurance-generator.  The endurance test of the generator shall
4.6.15
consist of eight cycles of runs No. 1 through 3, followed by a single run,
No. 4, as specified in Table II without damage to, or replacement of,
component parts.  Upon completion of the test, projected brush life shall
be not less than 500 hours.
Consecutive cycle-starter.  The starter-generator shall be
4.6.16
operated for three consecutive endurance cycles, as shown in Table III, at
30-second intervals without damage.  Cooling air shall not be applied during
this test.
4.6.17  Sea water immersion.  The starter-generator shall be subjected to
sea water immersion in accordance with 3.7.16.
4.6.18  Drive shear section.  Sufficient torsional force shall be applied
to the drive shear section to result in Its failure.  Failure shall occur
within the limits specified in 3.7.17.
Disassembly and inspection.  The starter-generator shall be dis-
4.6.19
assembled and inspected.  There shall be no evidence of major deterioration,
corrosion, or undue wear.
Bearing failure.  After disassembly and inspection, the starter-
4.6.20
generator shall be reassembled minus the lubricant, cage, and seals in the
bearing located in the flange end of-the unit.  The starter-generator shall be
operated as a generator delivering 200 amp 30V dc, 8,000 rpm with a cooling
air-pressure drop across the generator equivalent to 12 inches of water. The
starter-generator shall be operated for a period of not less than 4 hours.
During this test, only intermittent sparks that emanate from within shall be
permitted.  Any tendency to flame shall be cause for rejection.
Altitude rating chart.  The altitude rating chart specified in
4.6.21
3.15 shall be justified by tests.  Weight of airflow shall be shown at 4,400,
6,000, and 8,000 rpm at varying air density (altitude) and pressure drop
The output
across the generator up to and including 40 inches of water.
current shall be shown at 4,400, 6,000, and 8,000 rpm.
*
Environmental.  The starter-generator shall be subjected to the
4.6.22
following environmental tests in accordance with the specified procedure of
MIL-STD-810.
Low temperature.  Low temperature test shall be in accordance
4.6.22.1
with procedure I for a minimum of 72 hours.  At the end of this test, the
starter-generator shall complete without damage, three consecutive cycles in
accordance with Table III.
17

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