MIL-DTL-9398D
3.4.4 Shaft.
3.4.4.1 Shaft hardness. The hardness of the drive end of the shaft shall be Rockwell C30
to C40 in accordance with ASTM E 18.
3.4.4.2 Shaft strength. The drive shaft shall be provided with a shear section that will fail
within the torque limits of 35 inlb to 45 inlb.
3.4.4.3 Backlash. The shaft rotational backlash about its longitudinal axes shall not
exceed 6 angular degrees.
3.4.5 Stator lock. The stator assembly shall have a locking means to prevent rotation
between the stator or case and housing. A press fit will not be considered a locking means.
3.4.6 Weight. The generator shall be designed so that when completely assembled the
weight shall not exceed 1.9 pounds.
3.4.7 Screw threads. Screw threads 0.060 inch in diameter or larger shall be in accordance
with MIL-S-7742. All screws used in the construction of the generator shall be safety wired in
accordance with NASM33540.
3.4.8 Bearings. The shaft shall be supported by at least two bearings, one at each end of
the rotor. Wear shall be sustained by the bearings rather than by the supporting or attaching parts.
3.5 Electrical requirements.
3.5.1 Electrical connector. The generator shall be provided with a two-pin electrical
connector conforming to MIL-DTL-5015 as shown on MS25038. The connector shall be suitable
for use at high temperatures.
3.5.2 Electrical connections. The three leads from the generator windings shall be
designated B, A, and C (conforming to phases 1, 2, and 3). The B and A leads shall be connected
to the B and A pins of the electrical connector in such a manner that when the generator drive shaft
is rotated in a counterclockwise direction (looking into the spline end of the shaft) the sequence of
the generator output phase rotation shall be B, A, and C. The C lead shall be grounded to the frame
of the generator.
3.5.3 Wire. All electrical wire including both winding and connecting wire shall be made
of copper.
3.6 Performance. The generator shall perform satisfactorily when subjected to the
inspections specified in section 4 of this specification.
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