MIL-PRF-21480/12F(AS)
4.2.2.b In the last sentence of the paragraph, delete, "50 hours," and replace with "100
hours."
4.5.12 Delete and add: Electromagnetic interference. The system shall be subjected to an
electromagnetic interference test in accordance with MIL-E-81910 for Class IIIB equipment.
4.5.13 Delete and add: Wave form. The crest factor and harmonic content, line-line and
line-neutral, of the output voltage shall be determined under the following conditions:
a. At generator speed of 6000 RPM for no load and in 20 percent load increments to full
rated load, unity power factor.
b. Condition (a) shall be repeated for 0.75 power factor.
c. Conditions (a) and (b) shall be repeated at generator speeds of 5700 and 6300 RPM.
The following requirements must be met during all above tests. The line-neutral crest factor
shall be 1.41 ±10 percent. No harmonic shall exceed 3 percent of the fundamental.
4.5.20.1 Delete and add: Salt fog, control components. Control components shall be
subjected to a salt fog test in accordance with MIL-E-81910, except the duration of the test shall
not exceed 25 hours. At the completion of this test the unit shall successfully demonstrate its
buildup characteristics, the effects of application and removal of rated and 200% load, and
protective functions.
4.5.20.2 Delete and add: Oil-salt water ingestion, generators. The generator shall be
subjected to an oil-salt water ingestion test in accordance with MIL-E-81910. At the completion
of this test, the unit shall successfully demonstrate its buildup characteristics and the effect of
application and removal of rated and 200 percent load.
4.5.21 Delete and add: Fungus resistance. System components shall be subjected to a
fungus test in accordance with MIL-E-81910, with the installation instructions and mounting
nuts attached. At the completion of this test, the unit shall successfully demonstrate its buildup
characteristics, the effect of application and removal of rated and 200 percent load, and
protective functions. Mounting nuts are to be unaffected and the package holding the nuts
suitable for shipment. Instructions are to be legible.
4.5.22 Delete and add: Sand and dust. The generator shall be subjected to a sand and dust
test in accordance with MIL-E-81910. At the completion of this test the unit shall successfully
demonstrate its building characteristics and the effect of application and removal of rated and
200 percent load.
4.5.24 Delete and add: Shock. System components shall be subjected to a shock
test in accordance with MIL-E-81910. At the completion of procedure I, the unit shall
successfully demonstrate its buildup characteristics, the effect of application and removal of
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