1 Downloaded from https://www.everyspec.com MIL-STD-81OD. I 19 JUIY 1983 h. Deformation or fraoture of ‘components, i. Cracking of surface coatings. :‘ j. Leaking of sealed compartments. I-3 TEST PRO~ NOTE: Th,i?test method should be applied at the end of the tailoring process described in section 4 of this etandard. A@&aL@. This method is”applicable toequipment which may ex- .. perience ‘extremerapid temperature changes in its anticipated are= or mode of deployment~ ‘Theseinclude: ,,...,, ,...,’ ,.. . (1) Ascent from a desert airfield (high’temperature)”to high altitude (low temperature) in unheated aircraft compartments or stored externally. This ..
includee equipment such as aircraft external stores (~electricalequipment pods, guided bombs, etc.), stores installed in bomb bays, and optioal equipment. (2) Air delivery/airdropfrom high altitude’(low-temperature) to a desert environment (high temperature).‘ ,., ,., . (3) Transfer of (ground) equipment tO and from heated~areas within a low-temperature environment (includes air delivery’to a coldenvironment). ,. This method may also be used as a screening test to reveal potential flaws in equipment exposed to less extreme ‘conditions. ,, b.
This method is not intended for equipment that will m experience’sudden extreme temperature changes because of its packaging,~‘‘ installed location, etc. This is not to be used to assess performance char- acteristics after lengthy exposure to extreme temperatures, as are methods 501:2 and 502.2. Additionally, this method”does not address.the temperature shock experienced by equipment which is exposed to warm air and solar- radiation heating and is then immersed.in cold water,”or’the thermal.shock caused by rapid transient warmup by engine compressor bleed air. ,. :,. ,,”. c. &eUm!2e.
(See General Requirementsi 4.4.4.) This test method ehould follow the high- and low-temperature“test?where test item response characteristics and performance determinations have been obtained. Such information should be”used for better’defining the test conditions to’be used for this procedure. .. -,.. d. This method -tiasone ‘procedurefor which.there are several variations in application (temperature range). Before conducting the test, a determination must be made as to which test condition’ are appropriate. The test conditions that are used during the test are determined by: . -+ METHOD 503”.2 19’July 1983 503,2-2