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MIL-DTL-18239 Earphone H-87B/UThis specification covers one type of moving coil, dynamic type earphone designated as H-87B/U. This earphone transforms electrical energy into acoustical energy and may be acquired normally as component parts of a complete headset assembly. See 6.1, for information about use with cord assembly P/O H-87B/U, as specified in MIL-DTL-18266.

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MIL-DTL-18239E(AS)
TABLE II. Sampling plan for Group B inspection.
NUMBER OF EARPHONES
TOTAL NUMBER OF EARPHONES
ASSEMBLIES IN CONTRACT
TO BE TESTED
10 THRU 280
3
281 THRU 500
6
501 THRU 1000
9
1001 THRU 2000
12
2001 THRU 5000
15
5001 OR MORE
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*  4.5.4 Group C tests. Four random samples shall be selected from each inspection lot and
subjected to Group C tests. If one sample fails the lot is rejected. Separate samples shall be used
for the overload, temperature cycling and explosive decompression tests. The same sample shall
be used for the salt spray and impact tests. The impact test shall be performed after completion of
the salt spray test.
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