MIL-PRF-29580C
Step 6 - Repeat steps 3, 4, and 5 two additional times.
Following the high temperature test, the spectacles shall meet the requirements of 3.4.2 and 3.4.3.
4.5.3.5 Low temperature. The test sequence as specified below shall be followed:
Step 1 - Prepare the sample in accordance with paragraph 4.5.3.1.
Step 2 - Lower the internal chamber temperature to the storage temperature of -51 °C
(-60 °F) and maintain that temperature for a period of 24 hours after stabilization.
a. Photograph the sample after temperature stabilization.
b. Photograph the sample at 2 hour intervals for the remainder of the 24 hour
period.
Step 3 - Return the sample to standard ambient conditions and stabilize.
Photograph the sample after temperature stabilization.
Following the low temperature test, the spectacles shall meet the requirements of 3.4.2 and 3.4.3.
4.5.3.6 Temperature shock. The test sequence as specified below shall be followed:
Step 1 - Prepare the sample in accordance with 4.5.3.1.
Step 2 - Raise the internal chamber temperature to 66 °C (151 °F). Maintain that
temperature for a period of not less than 4 hours.
a. Photograph the sample after temperature stabilization.
b. Photograph the sample at the end of 2 hours and at the end of 4 hours.
Step 3 - Transfer the sample within 5 minutes to a cold chamber with an internal
temperature of -51 °C (-60 °F). Expose the sample to this temperature for a
period of not less than 4 hours.
a. Photograph the sample within 5 minutes of placement in the cold chamber.
b. Photograph the sample at the end of 2 hours and at the end of 4 hours.
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