MIL-DTL-3702F
4.7.3.5.2 Insertion in metal test sleeve. Upon completion of flexing, the specimen shall be wound on
a 1-inch diameter metal mandrel in such a manner that there shall be nine turns .75 inch (19 mm) apart,
and not less than 1 foot of cable shall extend at each end beyond the points of attachment to the mandrel.
A 5-pound weight shall be used during this preparation. The wound specimen shall then be placed in a
snug-fitting, belled-ends, metal sleeve in such a manner that the ends of the specimen protrude from the
belled ends of the sleeve. The metal sleeve shall be electrically connected to the mandrel as specified on
figure 3.
4.7.3.5.3 Liquid immersion for other than Air Force aircraft applications. While still wound on the
mandrel and confined by the metal sleeve, the cable specimen shall be subjected successively to an
uninterrupted sequence of tests as follows (for Air Force aircraft, see 4.7.3.5.4).
4.7.3.5.3.1 Salt-water solution. The specimen shall be heated for 5 hours in an oven at a
temperature of 600±8 °F for high temperature cable, 450±4°F for medium temperature cable, and
250±4°F for low temperature cable. At the end of the 5-hour period, the specimen with mandrel and
metal sleeve in position, shall be removed from the oven and immediately immersed for 18 hours in a 5
percent (by weight) aqueous sodium chloride solution (common salt in water). The test liquid shall be
maintained at a temperature of 120±2°F, throughout the period of immersion. At the conclusion of the 18-
hour period of immersion, the specimen shall be removed from the saltwater solution and drained for 30
minutes.
4.7.3.5.3.1.1 Voltage application. A potential of 15 kilovolts rms at a frequency of 60 Hz shall be
applied between the cable conductor and the mandrel and metal test sleeve for 30 minutes. The
specimen, while still wound on the mandrel but with the metal sleeve removed, shall be inspected visually
for evidence of burning over the ends, rupture of insulation, material deterioration, or other damage.
4.7.3.5.3.2 Engine oil. At the conclusion of the saltwater solution test specified in 4.7.3.5.3.1, the
same specimen, with mandrel and metal test sleeve in position, shall be reheated for 5 hours at the
temperatures specified in 4.7.3.5.3.1. At the end of the heating period, the specimen, with mandrel and
test sleeve in position, shall be immersed for 18 hours in oil conforming to Defense Grade 1100 of
SAE-J1966. The oil shall be maintained at a temperature of 195±5°F throughout the period of immersion.
At the conclusion of the 18-hour period of immersion in oil, the specimen shall be removed from the oil,
drained for 30 minutes, and subjected to the voltage application test specified in 4.7.3.5.3.1.1.
4.7.3.5.3.3 Turbine fuel, aviation. At the conclusion of the engine oil test specified in 4.7.3.5.3.2, the
same specimen, with mandrel and metal test sleeve in position, shall be reheated for 5 hours at the
temperatures specified in 4.7.3.5.3.1. At the end of the heating period, the specimen, with mandrel and
metal sleeve in position, shall be cooled to room temperature for a minimum of 1 hour and immersed for
18 hours in aviation turbine fuel conforming to grade JP-5 of MIL-DTL-5624. The test liquid shall be
maintained at room temperature throughout the period of immersion. At the conclusion of the 18-hour
period of immersion, the specimen shall be removed from the test liquid, drained for 1 hour, and
subjected to the voltage application test specified in 4.7.3.5.3.1.1.
4.7.3.5.3.4 Antifreeze compound. At the conclusion of the aviation turbine fuel test specified in
4.7.3.5.3.3, the specimen, with mandrel and sleeve in position, shall be immersed for 2 hours in
antifreeze compound conforming to ASTM-D3306, maintained at 185±5°F. After immersion, specimen
shall be drained for 30 minutes and immediately subjected to the voltage application test specified in
18
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business