MIL-DTL-6162C
component parts shall be as foolproof as possible to avoid incorrect assembly which would result in damage or
malfunction, or involve safety of flight (see 4.6.1).
3.4.5 Generator component design.
3.4.5.1 Armature/rotor - The machine shall be so constructed that the armature or rotor is readily removable for
maintenance. In no case shall it be necessary to disconnect soldered or brazed connections. Care shall be taken to
remove all burrs or projections, which might result in injury to the coils.
3.4.5.2 Commutator (for brush type machines). A turned-down section (step) shall be provided at the outboard
end of the commutator, the diameter of which shall be the minimum diameter to which the commutator can be safely
reduced during its maintenance life. Minimum diameter shall be consistent with brush stability. The copper
segments, when worn to the diameter of the step, shall be of ample section to operate satisfactorily and not throw out
due to centrifugal force. The method of securing the commutator to the shaft shall positively prevent rotational or
axial motion of the commutator relative to the shaft.
3.4.5.3 Shunt field. Unless otherwise specified in the associated specification sheet, the shunt field shall not
require more than eight (8) amperes maximum regulated field current nor require more than ninety (90) watts power
dissipation by the regulator. The required resistance in the external field shall not be less than 1.25 ohms (Ω) nor
more than 35 Ω under any operating condition. The accidental closure of the reverse current relay shall not reverse
the residual field. The shunt field shall be so designed that stabilization will occur and allow continuous generator
operation at any rated condition. External excitation shall not be required for buildup. At minimum speed, the
residual voltage shall not be less than + 0.8 volt.
3.4.5.3.1 Equalizer voltage. Unless otherwise specified in the associated specification sheet, provisions shall
be made in the machine such that a voltage drop of 2 volts ± 0.1 volts (V) is available between terminals D and E of
the generator, with the generator stabilized in temperature at rated load and cooling conditions. In brush type
machines, this voltage drop shall be accomplished by tapping the commutating and compensating field windings
between the E terminal and the negative brushes. A calibration curve may be used to permit acceptance testing at
temperatures between 5° C and 45° C.
3.4.5.4 Mounting flange. The machine mounting flange and spline drive shall be in accordance with the
associated specification sheet (see 4.6.1).
3.4.5.5 Oil seepage. The machine shall be designed to tolerate seepage of oil from the engine into the machine
at the rate of 3 cubic centimeters (cc) per hour or as specified on the applicable accessory mounting pad drawing if
greater.
3.4.5.6 Quick attach-detach (QAD) coupling. QAD coupling, if specified by the associated specification sheet,
shall incorporate provisions to prevent rotation of the frame during the starting or generating cycle in the event the
holding clamp is not properly torqued. Installation or removal of the machine shall not require special tools (see
4.6.1).
3.4.5.7 Flexible drive. Unless otherwise specified on the associated specification sheet, the machine shall be
equipped with a flexible drive and a shear section between the spline drive and armature. The shear section shall
limit the maximum torque, which the machine can transmit to the value specified in the associated specification
sheet. The shear section shall be so designed that damage to adjacent components will not result from the shearing
action. In addition, replacement of the failed shear section shall be possible without requiring major disassembly of
the machine.
3.4.5.8 Torsional vibration damper. A torsional vibration damping or coupling assembly shall be incorporated
between the drive spline and the rotor or armature of the machine for suppression of flexible drive torsional
vibration amplitudes (see 4.6.25).
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