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|  MIL-S-26547C
3.7.16 Sea water immersion. The starter-generator shall withstand five
sea water immersion cycles without replacement of parts except for brushes and
bearings. The sea water shall conform to the salt solution specified in MIL-
2 parts by weight of salt shall read 4
.1 and the
STD-810 except that 20
specific gravity shall be 1.026 to 1.034. The cycles shall conform to the
following:
a.
Complete immersion in sea water for 2 hours.
b. Removal from sea water and allowed to stand for 2 hours at normal
room ambient conditions.
c.
Complete submersion in fresh water for 5 minutes.
d. Removal from fresh water and allowed to stand for 3-1/2 hours at
normal room ambient conditions.
Disassembly, decontamination of components, followed by not more
10"C.
than 16 hours of drying at a temperature of 121
f. Reassemble with new brushes followed by operation for a period of
1 hour at 8,000 rpm, 200 amp, 30V dc at normal room ambient with cooling air
pressure drop across the generator equivalent to 12 inches of water.
3.7.17 Drive shear section. A shear section shall be incorporated
immediately after the drive spline. Shear shall occur between 880 to 1,000
inch (in) pound (lb). The shear section shall be designed so that its failure
will not result in loose pieces which could damage adjacent components. In
addition, replacement of a failed shear section shall be possible without
requiring a major disassembly of the starter-generator.
3.7.18 Bearing failure. The starter-generator, minus the seals, cage, and
lubricant in either bearing shall not become a potential fire hazard when
operated under conditions of 200 amp, 30V dc, 8,000 rpm.
3.8 Interchangeability. All parts having the same manufacturer's part
number shall be functionally and dimensionally interchangeable. The drawing
number requirements of MIL-D-1000 shall govern changes in the manufacturers
part numbers.
3.9 Radio noise interference. When operating as a generator, the starter-
generator shall be provided with the necessary radio noise suppression
features to suppress its radio noise to the limits specified in 4.6.12.1.
These features shall include adequate filters and enclosing case construction
which will prevent noise leakage through joints, seams, and mating surfaces.
The volume and weight of filtering equipment required shall be minimized by
the application of proper electrical and mechanical design and construction.
The filtering equipment shall be located inside the starter-generator.
3.9.1 Bonding. The frame structure of the starter-generator shall be so
assembled that there will be a continuous, low impedance path from the com-
mutator end bell to face of mounting flange. The direct-current resistance
between commutator end bell and mounting flange shall be not greater than 0.001
ohm. The area normally covered by starter-generator mounting nuts shall be free
from insulating type of surface treatment provided the 0.001 ohm frame
structure resistance is met. (See 4.6.12.1)
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