MIL-PRF-26542/4 Revision D, July 16, 2002
MICROPHONE ELEMENT, M-101/AIC
Microphone element M-101/AIC is a noise canceling dynamic moving coil microphone element designed for use on a headband type headset at low altitudes or for use in an oxygen mask or pressure-type oxygen helmet, at altitudes where the use of an oxygen helmet is required. The microphone element is intended to provide communication under the noise conditions encountered in military aircraft.
The microphone assembly shall be tested in accordance with the tests specified in table I.