MIL-DTL-17060G(SH)
(1) The motor comes adrift during exposure to HI shock. Motor parts come adrift with the exception of
parts that remain within the motor.
(2) Insulation failures during the dielectric strength test of 4.6.15.1.c.
4.6.15.3 Disposal of shock-tested motors. Motors which have failed to pass the high-impact shock test shall
not be acceptable, either as a whole or in any of the parts. However, motors which have passed the high-impact
shock test shall be considered acceptable as an item in the contract, provided the post-shock tests are passed and the
mechanical corrective measures below are accomplished. Minor deformations shall be those which do not cause
unqualified rejection of the design under the high-impact shock test but are in excess of the dimensional tolerances
specified on the applicable motor drawing.
a. Mounting flanges connecting directly to the driven auxiliary shall be replaced in the event of minor
deformation.
b.
Minor deformations affecting alignments (including alignments with the auxiliary) shall be corrected.
c.
All ball bearings shall be replaced.
d. Service C motors shall be restored to operational condition and shall be inspected as specified in 4.6.15.l(b)
and (d).
4.6.15.4 Shock extension. Motor shock test acceptance may be extended upon approval (see 6.11 and
Appendix D), based on the following:
a. If the acceptance of the tested motor is based on a Type A (combined motor and auxiliary) test, acceptance
may be extended to the same motor when applied to a different auxiliary if the accepted and proposed motor-
auxiliaries employ a flexible coupling and the auxiliaries are of the same basic type; for example, pumps or fans.
b.
Shock acceptance of a motor based on a Type A test is not extendable to a different motor.
c. Shock acceptance of a motor based on a Type B (motor only) test may be extendable to another motor
based on the following:
(1) The core length and shaft extension of the accepted motor shall be not less than that of the motor
proposed for extension.
(2) The shaft extensions of the accepted and proposed motors shall have similar configurations. The shaft
height, "d" dimension (see figures 1 through 4), shall be identical.
(3) The motor configurations shall be similar.
4.6.15.5 Waiver. Where the motor will be shock tested as part of an overall package, shock test of the motor
alone is not required.
4.6.16 Heat-run test. The heat-run test for motors shall utilize embedded thermocouples in accordance with the
following and Methods 1 and 2 of MIL-E-917 for the first article test. Periodic tests may be in accordance with
Method 2 of MIL-E-917. The heat-run test for continuous duty motors shall be in accordance with the following:
a.
Rated motor load - 100 percent
b.
Voltage and frequency - rated
c.
Time - until motor temperatures are constant
Motor load may be obtained by maintaining the current or watt input corresponding to rated motor hp output.
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