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|  MIL-V-85830(AS)
4.8.3.2 Mechanical. The canister ports shall be fitted securely with
canisters which shall then be removed. This operation shall be repeated 200
times. A battery shall be installed 200 times and the motor shall be switched
`ON' and `OFF' each time to ensure correct operation. There shall be no
damage to the electrical contacts on the ventilator. At the conclusion of the
mechanical endurance test, the ventilator shall be tested in accordance with
4.8.2.1, 4.8.2.2, 4.8.2.3, 4.8.2.4, and 4.8,2.5 and shall meet the
requirements of 3.9.1, 3.9.2, 3.9.3, 3.9.4, and 3.9.5 as specified in 3.9.9.2.
4.8.3.3 Reliability. Five ventilators shall be tested using Test Plan IVC
of MIL-STD-781. (These units shall not be the same units used for
environmental testing. ) Each ventilator shall be subjected to 315 hours of
testing. The test cycle shall be 14 hours in duration and shall consist of a
7 hour hot mission and a 7 hour cold mission. Cold mission temperature levels
shall start at +131DF, rise to +158F for 1 hour followed by 1 hour at +131F
with the remaining 5 hours at -14F. Hot mission temperature levels shall
start at -14F lowered to -40QF for 1 hour, followed by 1 hour at -14F, with
the remaining 5 hours at +131F.
Each ventilator shall be simultaneously
vibrated during the test cycles. The vibration shall be conducted in each of
3 axes (vertical, horizontal, longitudinal). The ventilator shall be secured
to the vibrator by the ventilator mount assembly (drawing 1605AS41O). Each
ventilator shall accumulate 15 vibration cycles in each axis. Canisters shall
be changed after every 24 hours of vibration time. Power shall be provided by
simulated 28vdc aircraft power. The ventilators shall be subjected to the
operational tests as specified in 4.8.2.1, 4.8.2.2, 4.8.2.3, 4.8.2.4 and
4.8.2.5 and meet the requirements of 3.8.
4,8.4 Environmental tests. Environmental tests shall be conducted in the
sequence specified in Table VI. Prior to and at the completion of each
envrionmental test, the ventilator shall be tested as specified in 4.8.2.1,
4.8.2.2, 4.8.2.3, 4.8.2.4, and 4.8.2.5, and shall meet the requirements of
3.9.10.
For each environmental test which requires operation of the
ventilator, 28 volts d.c. external power shall be supplied at the external
power connector, unless otherwise specified in the contract.
4.8.4.1 High temperature. The ventilator shall be tested as specified in
MIL-STD-81O, Method 501.2, Procedure II, Operation. The ventilator shall be
placed in a climatic chamber. The chamber temperature shall be raised to
158F at a rate of 5F0 per minute. The chamber temperature shall be
maintained at that temperature for a period of one hour. The relative
humidity shall not exceed 75 percent. The temperature shall then be reduced
to 131F at a rate of 5F per minute and maintained at that temperature for a
period of six hours. External power shall be connected at the external
connector. The motor switch shall be selected to the "ON" position. The
ventilator shall meet the requirements specified in 3.9.10 and 3.9.10.1.
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