MIL-DTL-38195D
3.3.2 Endurance. The set shall pass an endurance test of 1,000 hours of operation when at sea level or at
equivalent atmospheric conditions (see 4.5.2 and 4.6.9).
3.4 Operational environment. Operational environment for starting, operating, handling, and storage.
3.4.1 Starting. The set shall start (see 6.3.1) within 30 seconds as specified (see 3.9.1; 3.10.1; 3.11; 4.2;
4.4.1.2.4; 4.4.1.2.5; 4.4.1.2.7; 4.5.1; and 4.5.2):
At ambient temperatures for -20° to +125° F (-28.9° to +51.7° C) at any possible relative
a.
humidity.
b. At ambient temperatures for -65° to +20° F (-53.9° to -28.9° C) after set battery has been short-
circuited for not more than 10 minutes.
c. With 4 inches of rain per hour impinging on the set at angles from the vertical up to 45 degrees,
from all compass-point directions (see 4.5.2).
d.
With base of the set in planes from level to 15 degrees from level, in all 4 directions (see 4.5.2).
e. At any altitude up to an including 10,000 feet above sea level at an ambient temperature of 77° F
(25° C) (see 4.5.2).
3.4.2 Operation. Within 20 seconds after starting, the set shall accept full load without surging or creating an
engine over-temperature condition (see 4.5.1 and Table V test 27).
3.4.2.1 Operating speed. The operating speed of the generator set shall withstand 5 minutes of continuous
operation at no-load and 105 percent of rated speed without mechanical or thermal damage (see 4.2; 4.3.3; and
4.5.1).
3.4.2.2 Critical speed. The turbine-generator combination shall be free from injurious flexural vibrations and
dangerous torsional critical speeds (see 6.3.4 and 6.3.7) between 5 percent below normal operating speed and over
speed shutdown.
3.4.2.3 Stopping. Within 60 seconds (from idle RPM) after activation of any device intended to stop the set, the
RPM shall go to zero (see 4.2; 4.5.1; and 6.3.2).
3.4.3 Handling. Forklift provisions shall be required to permit the set to be lifted and transported, at the center
of balance axis, without deformation or damage to the set (see 4.3.2).
3.4.3.1 Rough handling. The set shall not be damaged (see 6.3.8; 6.3.9; 6.3.10; and 6.3.11) by rough handling
which could be encountered during transportation (see 4.5.2; 4.6.3; 4.6.4; and 4.6.6).
3.4.4 Storage temperature and humidity. The set shall not be damaged (see 6.3.3) by storage in temperatures
from -65° to +155° F (-53.9° to 68.3° C) at any relative humidity possible within that range and shall not be
damaged by exposure to five consecutive 48-hour cycles as specified in MIL-STD-705, Method 711.1d (see 4.5.2).
3.5 Performance.
3.5.1 Electrical performance (no pneumatic output).
3.5.1.1 Normal rating. The rated electrical output of the set shall be as follows:
a. 60 kW at 0.8 PF, 3-phase, 4 wire, 120/208V, 400 Hz (measured at load end of power cable using a
reactive load bank).
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