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|  MIL-D-70789A (AR)
4.8.5.22
Explosive atmosphere. Explosive Atmosphere tests
shall be performed on the DRU in accordance with MIL-STD-810,
Method 511.2, Procedure I and paragraph 3.8.6.2 at a simulated
0
test altitude of 10,000 feet and a temperature of +140 F.
4.8.6
Demonstrations.
4.8.6.1 Operational demonstrations. The DRU, installed in
a wheeled vehicle, shall be tested for two missions over a
government approved test course. The time to traverse the test
course shall be approximately 6 hours. In addition to the
initialization point, the test course shall have 12 survey
control points, spaced approximately equally in time, for
measurement of DRU survey parameters. The conditions for each
mission shall be:
MISSION
1
2
CONDITION
Normal Align
Odometer Mode
Exclusive ZUPT mode
Mounting, a =
The following parameters shall be measured and recorded.
a.
Alignment time.
Time o-f each zero-velocity stop and duration of
b.
each zero-velocity stop.
c. Horizontal position, altitude, pointing device
attitude (azimuth, pitch, roll) and distance traveled at the
initialization point and each survey control point.
Using the above data, the position, altitude, and pointing device
attitude (azimuth, pitch, roll) error characteristics shall be
calculated.
The DRU shall meet the requirements of paragraph 3.6. Failure to
meet the specified value of any parameter shall constitute
failure of the test.
Reliability demonstration.
4.8.6.2
4.8.6.2.1
General. The DRU shall be tested as specified
herein. The "accept" and "reject" criteria shall be in
accordance with MIL-STD-781, Test Plan XXC. The upper and lower
test MTBE's shall be 4000 and 2000 hours respectively. The
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