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Environmental service conditions. |
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|  MIL-D-70789A (AR)
3.7 Environmental service conditions. Except as otherwise
noted, the DRU shall operate under any combination of the
environmental conditions specified below.
Temperature.
3.7.1
3.7.1.1 Operational. The DRU shall operate in ambient air
and on a mounting surface with temperatures within the range of
0
+140F (+60"C) to -50F (-46 C).
3.7.1.2 Temperature shock. The DRU shall not be damaged nor
rendered inoperable when subjected to abrupt temperature changes
0
from -60F (-51 C) to +160F (+71C).
The,DRU 0
shall withstand
3.7.1.3 Storage and transportation.
storage and transportation temperatures from +160 (+71W) to
-60F (-51C) without any deterioration or adverse effects which
may cause failure when the DRU is restored to operation.
Environmental stress screening (ESS) - temperature.
3.7.1.4
Each sequence shall include a minimum of 10 temperature cycles
Temperature Cycling
with the last three cycles failure free.
shall be performed. as shown in Figure 11. Alignments shall be
performed with the DRU reference frames, x and y (Figure 27),
approximately level. Azimuth, pitch and roll data at the
conclusion of alignments shall be recorded. Position data during
the survey mode shall be recorded every 5 minutes.
3.7.2 Altitude. The DRU shall operate at altitudes from
-1000 meters to +10,000 meters. Non-operating, the DRU shall
withstand exposure to altitudes from -1000 to +21,336 meters.
3.7.3 Humiditv. The DRU shall not be damaged by operation,
transportation, or storage in environments with ambient relative,
humidity within the range of 1 to 100 percent.
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