Downloaded from https://www.everyspec.com MIL-STD-81OC 10 March 1975 METHOO S12.1 LEAKAGE (INMERSION) 1. PURPOSE. The purpose of this test is to determine the ability of the equipment to be immersed in water without leakage of the water into the enclosure. 1.1 General effects. Air seepage in the form of bubbles would be an indi- cation of defective equipment or workmanship. Water seepage into the equip- ment could cause corrosion or fouling of lubricants between moving parts. 2. APPARATUS 2.1 Procedure 1. Water container and acce&.series. 2.2 Procedure II. DISCONTINUED. 2.3 Procedure ‘III. Altitude chamber, water container,and accessories. 2.4 Procedure IV. Altitude chamber and accessories.
3. PROCEDURES 3.1 Procedure I. (This is a test for gross leakage only.) 3.1.1 Preparation. Wlere applicable, open and close (or remove and replace) doors and covers three times immediatelybefore tests. 3.1.2 Test conditions. The temperature of the water shall be 18° i5° C (64° i9”F) and the temperature of the test item shall be 45° *3° C (113° *5”F). The water container shall be of sufficient capacity so that the immersion of the test item will not raise the temperature of the water more than 3° C (S”F). 3.1.3 Performance of test.
Immerse the test item (covers closed on field transported items) in the water so that the uppermost point of the test item is 36 t5 inches below the surface of the water. The test item shall remain immersed for 120 t5 minutes. Upon completion of the test period, remove the test item from the water and wipe the exterior surfaces of the test item dry. Open the test item and examine the interior and contents for evidence of leakage. 3.2 Procedure II. DISCONTINUED. 512.1-1 METHOD 512.1 10 March 1975