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|  MIL-D-70789A (AR)
4.8.4 Human factors examination. The equipmrent shall be
examined by trained human factors engineers for compliance with
requirements of 3.8.7.
Failure of the equipment to comply with the requirements of 3.8.7
shall constitute failure of this test.
4.8.5
Environmental
tests.
4.8.5.1
General. Where a test calls for a simulated survey
mission, the DRU shall be operated in the Exclusive ZUPT Mode
with four minute "travel" periods between 30 second ZUPTS. The
DRU shall be operated for equal time periods with the input
supply voltage at the nominal level, the lowest specified limit,
and the highest specified limit.
During a simulated survey mission the DRU shall be tested for:
normal BIT, ALERT and STATUS indications; horizontal position and
altitude values within approved limits; and azimuth drift within
approved limits.
Failure to meet the specified value of any parameter shall
constitute failure of the test.
4.8.5.2 Pre and post testing. Prior to and after each
test, where the equipment is tested in a static mode (chamber and
mechanical tests), a series of tests shall be performed to verify
proper operation of the equipment. The equipment shall be
inspected for physical damage, loose hardware, degradation of
materials or any other defects after each test. Should the
system set up remain the same from one major test to the next,
the post-test verification test may serve as the pre-test
verification test for the next major test.
4.8.5.3
Altitude. Low Pressure (altitude) tests shall be
performed on the DRU in accordance with MIL-STD-810, Method
500.2, procedures I (non-operating) and II (operating). A
simulated altitude of 40,O00 feet shall be maintained for 1 hour
during the non-operating test. The operating test shall consist
of a one hour simulated survey mission at a simulated altitude of
10,000 feet. The rate of altitude change shall not exceed
10 meters/second. The DRU shall meet the requirements of
paragraph 3.7.2.
4.8.5.4 High temperature. A high temperature test shall be
performed on the DRU in accordance with MIL-STD-810, Method
501.2, procedures I (storage) and II (operating). The storage
test shall be conducted at a temperature of +160T for seven 24
hour periods (total of 168 hours). The temperature cycle for the
operating test shall be in accordance with Induced Conditions as
106
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