combiners. Specific requirements tailored for ┬ôspace flight application┬ö components are included to represent the highest reliability components specified herein. Such components are intended for use in NASA manned, satellite, interplanetary or launch vehicle programs.

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MIL-DTL-23971D

3.6.1.1 Hermetic seal (when specified, see 3.1). When the items are tested as specified in 4.7.2.1, the leakage

rate shall not exceed the following:

Sealed volume case

Maximum allowable leakage

-6

Greater than 2 cubic inches

atm cm /s

-8

2 cubic inches or less

10 atm cm /s

The volume shall be computed using the external dimensions of the case, disregarding any mounting (screws,

stud, etc.). Following this test, the VSWR, insertion loss, and isolation values shall be as specified in 3.5.2, 3.5.3, and

3.5.4, respectively.

3.6.1.2 O-ring, solder seal, or encapsulated or enclosed seal (when specified, see 3.1). When the items are tested

as specified in 4.7.2.2, the VSWR, insertion loss, and isolation values shall be as specified in 3.5.2, 3.5.3, and 3.5.4,

respectively.

3.6.2 Barometric pressure (unless otherwise specified, see 3.1). When the items are tested as specified in 4.7.11,

there shall be no evidence of breakdown, charring, or arcing. Following this test, the VSWR, insertion loss, isolation,

and phase, amplitude balance values shall be as specified in 3.5.2, 3.5.3, 3.5.4, 3.5.5, and 3.5.6, respectively.

3.6.3 Thermal shock (unless otherwise specified, see 3.1). When the items are tested as specified in 4.7.12, the

VSWR, insertion loss, and isolation values shall be as specified in 3.5.2, 3.5.3, and 3.5.4, respectively.

3.6.4 Terminal strength. When terminals are tested in accordance with 4.7.13, there shall be no mechanical

damage or evidence of loosening or rupturing. Bends shall not be considered as damage unless surface cracking is

evident.

3.6.5 Resistance to solvents. When the items are tested in accordance with 4.7.14, there shall be no evidence of

mechanical damage and the marking shall remain legible.

3.6.6 Resistance to soldering heat. When the items are tested in accordance with 4.7.15, there shall be no

evidence of mechanical damage and the VSWR, insertion loss, and phase and amplitude balance values shall be as

3.6.7 Solderability. When terminations are tested for solderability as specified in 4.7.16, they shall meet the

evaluation criteria of the cited test method.

3.6.8 Vibration. When items are tested as specified in 4.7.17, there shall be no evidence of physical damage and

the VSWR, insertion loss, isolation, and phase and amplitude balance values shall be as specified in 3.5.2, 3.5.3,

3.6.9 Shock. When items are tested as specified in 4.7.18, the VSWR, insertion loss, isolation, phase and

amplitude balance values shall be as specified in 3.5.2, 3.5.3, 3.5.4, 3.5.5, and 3.5.6, respectively.

3.6.10 Moisture resistance. When items are tested as specified in 4.7.19, the phase and amplitude balance, and

power level values shall be as specified in 3.5.5, 3.5.6, and 3.5.7, respectively.

3.6.11 Salt atmosphere (unless otherwise specified, see 3.1). This test may be performed on empty flatpacks or

pin packages. When the items are tested as specified in 4.7.20, there shall be no evidence of destructive corrosion.

3.6.12 Sand and dust. When the items are tested as specified in 4.7.21, there shall be no sand and dust

accumulation within the enclosure and the phase and amplitude balance, and power level values shall be as specified

3.6.13 Explosion (when applicable, see 3.1). When the items are tested as specified in 4.7.22, there shall be no

ignition of the ambient atmosphere.