MIL-PRF-26611F
3.6.5.3 Flexibility. The shaft face shall be capable of moving 0.016 inch in any direction about
the generator centerline without rotating or bending the shaft. The shaft rotational backlash about
its longitudinal axis shall not exceed 6 angular degrees. Free axial play shall not exceed 0.021
inch. Shaft deflection from the generator centerline shall not exceed 10 degrees.
3.6.6 Weight. The generator shall not exceed 1.2 pounds.
3.6.7 Interchangeability. All parts having the same manufacturer's part number shall be
functionally and dimensionally interchangeable.
3.6.8 Reliability. The generator shall have a minimum mean time between failures (MTBF) of
3,000 hours.
3.6.9 Maintainability. No special tools shall be required for the installation, removal,
adjustment, or repair of the generator.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. Qualification inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 Qualification inspection. Qualification shall be performed on eight generators. Four
generators shall be subjected to all tests in 4.6, one shall be used for the fungus test (see 4.6.15),
and three shall receive the shaft failure test (4.6.20).
4.3 Conformance inspection. Conformance inspection shall consist of tests indicated in 4.3.1
and 4.3.2.
4.3.1 Individual tests. Each generator shall be subjected to tests indicated in 4.6.1 through 4.6.5.
4.3.2 Sampling tests. For the first 100 generators, 10 shall be selected randomly, and for each
additional 100 units, 5 generators shall be selected randomly and subjected to the tests in 4.6.1
through 4.6.7 and 4.6.10
4.4 Inspection conditions.
4.4.1 Atmospheric conditions. Unless otherwise specified, all tests shall be performed at room
temperature and atmospheric pressure.
4.4.2 Voltages. All voltages are rms values. The voltmeter shall have an accuracy of 1% or
better, and meter errors shall not be included in errors attributable to the generator.
4.4.3 Test indicator. Unless otherwise specified, a percent rpm indicator shall be used.
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