MIL-PRF-26611F
3.4.3 Lubrication resistance. The generator shall be resistant to oil conforming to
MIL-PRF-7808 or MIL-PRF-23699.
3.5 Environmental conditions. The generator shall be capable of operation under the following
conditions:
a. Temperatures ranging from -85° to 450°F.
b. Vibration up to 20g at frequencies from 5 to 2,000 Hz.
c. Relative humidity up to 100 percent.
d. Oil temperatures from -50° to 350°F.
e. Altitude to 80,000 feet.
f. An explosive atmosphere without igniting a fuel vapor-laden environment.
3.6 Performance.
3.6.1 Overspeed and reverse operation. The generator shall operate at any speed up to 5,500
rpm in either direction of rotation and in any mounting position. The generator output voltage
shall be three phase and have a frequency of one cycle per revolution of the generator drive shaft.
3.6.2 Dielectric strength. There shall be no insulation breakdown when a potential of 500 V root
mean square (rms) is applied between any electrical pin contact and any metal part of the
generator case without the C lead grounded.
3.6.3 Voltage output. The output voltages shall be 21 ± 0.5 when operated at a drive shaft speed
of 4,200 rpm and connected to a load consisting of three 40-ohm, Y-connected resistances. None
of the output voltages shall be less than 3.5 when operated at a drive shaft speed of 1,000 rpm
and connected to a load consisting of three 20-ohm, Y-connected resistances.
3.6.4 Case.
3.6.4.1 Leakage. The generator case shall withstand oil leakage from the engine into the
generator mounting flange at maximum rate of 0.3 inch per hour.
3.6.4.2 Drainage. Oil and combustible fumes shall not accumulate in the case.
3.6.5 Shaft.
3.6.5.1 Hardness. Hardness of the drive end of the shaft shall be Rockwell C-30 to C-40.
3.6.5.2 Strength. The shear section of the drive shaft shall withstand 40 ± 5 inch-pounds of
torque, and twist through a minimum of 270 degrees before yielding.
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