7 \ Downloaded from https://www.everyspec.com \ MIL-STD-81OD, 19 July 1983 \ most severe location. (The maximum temperature occurs for approximate y 1 hour in each cycle.) When considering extended storage, critical test items, or test items determined to be very sensitive to high temperature, the number of cycles should be increased to asaure that the design requirements are met. (2) Operation. The minimum number of cycles for tbe operational exPosure test is three. This number should be sufficient for the test item to reach its maximum response temperature. A maximum of aeven cycles ia suggested when repeated temperature response ia difficult to obtain. d.
Determine the test item configuration. The anticipated configurations ) of the test item during storage and operation should be used during the teat. As a minimum, the following configurations abould be considered: (1) In a shipping/atorage container or transit case. (2) Protected or unprotected (under canopy, enclosed, etc.). (3) In its normal operating configuration (reali-sticor with reatrainta, such aa with openings that are normally covered). (4) Modified with kits for special applications. liumdltv. . e. LOW relative humidity (RH) may occasionally have a significant effect on some material during high-temperature testing.
In such instances, consideration must be given to controlling RH as indicated in tables 501.2-I and 501.2-II. f. @itical item comuona. Components of a test item that.are known or suspected to be sensitive to the effects of high temperatures And whose failure will affect the overall performance of the test item are referred to as ncritical item components.” These components should be identified and thoroughly evaluated before tbia test to eliminate testing exposures that would not realistically be encountered by tbe test item during its life cycle. s. ~. . . Review the equipment specifications and requirements documents. Apply any additional guidelines necessary. I-4 I-4.1 wure analvti.
The failure of a test item to meet the requirements c. of the equipment information must specifications must be analyzed carefully, and releted be considered, such as: a. Results the storage test of nondestructive examination (if any) of materiel following may be conducted at the extreme temperatures. . b. Degradation or changes in operating characteristic allowed at the high extreme temperatures. c. Necessity for special kits or special operating procedures for high temperature exposure. o METHOD 501.2 19 hly 1983 501.2-11