MIL-DTL-3702F
4.7.3.6.3.2 Oil immersion. Each test specimen, as thus wound on the mandrel, shall be immersed
for 40 hours in oil with not less than 3 inches of each end protruding above the surface. The oil shall be
maintained at 195±5°F during the immersion. Each test specimen shall be tested in oil conforming to
cable shall be subjected to the test using oil conforming to MIL-PRF-7808. At the conclusion of the 40-
hour immersion period, the wound specimen shall be removed from the oil and allowed to cool.
Measurements of the cable diameter shall then be repeated at the same locations as determined in
4.7.3.6.3.1. The diameters shall be averaged and the percentage of swell calculated using the equation
below:
(Y - X )100
Percentage of swell =
X
where:
Y = diameter average after oil immersion,
X = diameter average prior to oil immersion.
4.7.3.6.4 Flammability. The flammability test specimen shall consist of a 20 inch (635 mm) length of
cable prepared and tested as follows.
4.7.3.6.4.1 Apparatus. The testing apparatus shall consist of a Bunsen burner having a .25 inch
(6.4 mm) inlet, a nominal bore of .375 inch (9.5 mm), a length of 4 inches (102 mm) above the primary
inlets, and equipped with a wingtop flame spreader having a .0625 x 2-inch (1.6 x 51 mm) opening fitted
to the top of the burner.
4.7.3.6.4.2 Preparation. The specimen shall be suspended taut in a horizontal position within a
partial enclosure which shall allow a flow of air sufficient for complete combustion, but which shall be free
of drafts.
4.7.3.6.4.3 Procedure. The tip of a 2 inch (50.8 mm) gas flame, with an inner-cone of .75 inch (19
mm), shall be applied to the center of the length of cable as shown on figure 5. The flame shall be
applied for 15 seconds, after which time the cable shall be observed for evidence of separation or burning
particles, and the rate of travel of the flame along the cable shall be recorded.
4.7.3.6.5 Fungus. The fungus test specimens shall consist of five lengths of cable, each 4 feet long.
Tests shall be conducted in accordance with ASTM-G21, except that no performance test shall be
conducted during exposure. At the end of the 90-day test, each specimen shall be subjected to the test
specified in 4.7.3.2.
4.7.3.6.6 Anti-icing fluid. The anti-icing test specimen shall consist of a 4-foot length of completed
cable prepared and tested as follows.
4.7.3.6.6.1 Preparation. The specimen shall be wound on a mandrel in the manner specified for the
corona effects test (see 4.7.3.6.7.1).
4.7.3.6.6.2 Immersion. The specimen, as thus wound on the mandrel with metal test sleeve in
position, shall be immersed for 16 hours in anti-icing fluid (50 percent alcohol, 50 percent water) at room
temperature, with not less than 3 inches (76.2 mm) of each end protruding above the surface. Anti-icing
fluid used for testing shall conform to MIL-E-51454. After immersion, the specimen shall be removed and
drained for 30 minutes and subsequently tested as specified in 4.7.3.2.
4.7.3.6.7 Corona effect. The corona effect test specimens shall consist of two lengths, each 4 feet
long, of unshielded or shielded cable with the shielding removed, prepared and tested as follows.
22
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business