MIL-PRF-62540A(AT)
3.4.3.1 Humidity. The harness and cable assemblies shall meet the specified performance
requirements of 3.4.1 and 3.4.2, during and after exposure to a relative humidity of 94 +4% at
35 +1 (95 +2 degrees Fahrenheit ( F)) (see 4.6.9.1).
3.4.3.2 Low temperature.
3.4.3.2.1 Storage. The harness and cable assemblies shall meet the specified performance
requirements of 3.4.1 and 3.4.2, after exposure to ambient temperature down to -51 C (-60 F)
(see 4.6.9.2).
3.4.3.2.2 Operating. The harness and cable assemblies shall meet the specified
performance requirements of 3.4.1 and 3.4.2, during and after exposure to temperature down to
-51 C (-60 F) (see 4.6.9.2).
3.4.3.3 High temperature.
3.4.3.3.1 Storage. The harness and cable assemblies shall meet the specified performance
requirements of 3.4.1 and 3.4.2, after exposure to ambient temperature up to 71 C (160 F)
(see 4.6.9.3).
3.4.3.3.2 Operating. The harness and cable assemblies shall meet the specified
performance requirements of 3.4.1 and 3.4.2, during and after exposure to temperature up to 60 C
(140 F) (see 4.6.9.3).
3.4.3.3.3 Extreme. When specified on the applicable harness or cable drawing, the
assembly shall meet the performance requirements of 3.4.1 and 3.4.2 during and after exposure to
the extreme high temperature of 149 C (300 F) (see 4.6.9.3).
3.4.3.4 Submergence. The harness and cable assemblies shall meet the specified
performance requirements of 3.4.1 and 3.4.2, before, during and after submergence. The assembly
shall be subjected to a differential pressure of 20.7 +3.5 kilopascals (kPa) (3 +0.5 pounds per
square inch (psi)) (see 4.6.9.4).
3.5 Identification marking.
3.5.1 Harness and cable marking. Unless otherwise specified on the applicable harness or
cable drawing the harness and cable assemblies identification shall be marked on the outer surface
of the jacket. In the case of assemblies greater than 1.6 cm (0.625 in.) marking shall be located
180 opposed. Marking shall remain legible after exposure to all environments (see 4.6.2).
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