Downloaded from https://www.everyspec.com ) 3.4.2 MIL-STD-81OC Performance of test. The test shall be conducted as follows: Step 1 - The test chamber shall be sealed. The ambient chamber temperature shall be the highest operating temperature of the equipment. A time of 3 :1 minutes shal1 be allowed for sufficient fuel vapor and air to be introduced and circulated throughout the test chamber. Step 2 - The equipment shall be turned on and left in standby mode until thermal stabilizationof the equipment has been attained. This period shall be not less than 5 minutes. Step 3 - The equipment shall be operated in a normal cycle for a minimum of 5 minutes.
The maximum temperaturesattained at the suspected components shall be recorded. If a temperature in excess of 204° C (400”F) is attained, the operational cycle shall be extended to a minimum of 10 minutes. If an explosion occurs, the temperatureattained at that time shall be recorded. Step 4 - If an explosion does not occur, the potential explosive- ness of the air-vapor mixture shall be verified by ignit- ing a sample of the mixture within the chamber, ) 4. SU%R; . The following details shall be as specified in the equipment speclflcatlon: a. Procedure number b. Pretest data required c. Failure criteria d. Mechanical and electrical load (procedure1, 3.1.1(c)) e.
Chamber temperature condition, if lower than 71”C (160°F) (procedure 1, step 1). 511.1-11 METHOD 511.1