MIL-DTL-85110B(AS)
Step 1. The RRHB shall be examined per 4.2.1 and subjected to the actuation (see 4.2.4.1)
and manual release (see 4.2.4.2) tests under the standard ambient conditions
specified in MIL-STD-810. A record of specific pretest data shall be made to
determine that the RRHB is within the requirements of 4.2.1, 4.2.4.1, and 4.2.4.2.
Step 2. Lower the internal chamber temperature to the storage temperate -57°C (-70°F)
and maintain for a period of 24 hours after stabilization.
Step 3. Increase temperature to -40°C (-40°F) and stabilize RRHB temperature. Remove
RRHB from chamber and install on a test fixture within a five minute time period,
and perform the actuation (see 4.2.4.1) and manual release (see 4.2.4.2) tests, after
which examine the test item per 4.2.1.
4.2.2.4 Dust. The material used in testing shall contain a mixture of 50% - 50% by weight
of deck compound per MIL-D-23003 and MIL-STD-810 dust. The dust test shall be performed
in accordance with MIL-STD-810, Method 510.3, Procedure I, except that the steps shall be as
follows:
Step 1. The RRHB shall be examined per 4.2.1 and subjected to the actuation (see 4.2.4.1)
and manual release (see 4.2.4.2) tests under the standard ambient conditions
specified in MIL-STD-810. A record of specific pretest data shall be made to
determine that the RRHB is within the requirements of 4.2.1, 4.2.4.1 and 4.2.4.2.
Step 2. Set the chamber controls to maintain an internal chamber temperature of 23°C
(73°F) and a relative humidity of less than 22%. Adjust the air velocity to 1,750 ±
250 feet per minute. Adjust the dust feeder to control the dust concentration
at 0.3 ± 0.2 grams per cubic foot. With the test item not operating, maintain these
conditions for 6 hours.
Step 3. Stop the dust feed and reduce the air velocity to 300 ± 200 feet per minute. Raise
the internal chamber air temperature to 63°C (145°F). Hold these conditions 16
hours.
Step 4. While holding chamber temperature at 63°C (145°F) adjust the air velocity to
1,750 ± 250 fpm. Adjust the dust feeder to control the dust concentration at 0.3 ±
0.2 grams per cubic foot. Unless otherwise specified, with the test item
non-operating, maintain these conditions for 6 hours.
Step 5. Turn off all chamber controls and allow the test item to return to standard ambient
conditions. Remove accumulated dust from the test item by brushing, wiping, or
shaking, care being taken to avoid introduction of additional dust into the test item.
Dust shall not be removed by either air blast or vacuum cleaning.
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