MIL-DTL-11193E
4.7.5 Immersion test. The microphone shall be immersed to a minimum depth of 3 feet of fresh water (65 to 80°F)
for 2 hours. After immersion, the microphone shall be removed from the water, wiped dry on exterior surfaces, and
the switch cavity opened; leakage constitutes failure (see 3.7.3).
4.7.6 Switch contact pressure. With the switch closed by depressing the activating bar, a minimum force of 25
grams shall be required, using a spring gage, to separate each pair of switch contacts. This test may be made on
completed switches before they are installed in the microphones.
4.8 Inspection for interchangeability. Each replaceable part listed below in the selected microphone shall be
interchanged with the corresponding part in the approved first article sample in sequential order. At the completion of
this inspection, the interchanged parts shall be reassembled in their original microphones. Non-interchangeability of
these parts constitutes failure.
Switch
Boot
Retainer plate
Cable relief spring, retaining bushing, end cord
Microphone mounting clip
Mounting screws
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature, which may be helpful, but is not mandatory.)
6.1 Intended use. Microphones M-29( )/U and M-52( )/U are intended for general purpose use.
6.2 Acquisition requirements. Acquisition documents should specify the following.
(a) Title, number, and date of this specification.
(b) Type required.
(c) Number of preparation samples required.
(d) First article inspection (see 6.6).
6.3 Nomenclature. The parenthesis in the nomenclature will be deleted or replaced by a letter identifying the
particular design; for example; M-29W/U. The contractor should apply for nomenclature in accordance with the
applicable clause in the contract (see 1.1).
6.4 Group C inspection. Approval to ship may be withheld, at the discretion of the Government, pending the
decision from the contracting officer on the adequacy of corrective action (see 4.3.2.2).
6.5 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin
whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture
and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied
over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass,
have shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM-B545
(Standard Specification for Electrodeposited Coatings of Tin) (see 3.2.1).
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