TM 1-8415-216-12&P
p. Adapter, Microphone (Figure 1-17). The adapter, microphone provides an interface
between the M43 mask and the TEMPEST communications system. A switch on
the adapter plug allows the operator/wearer to select the helmet boom microphone or
the mask microphone without having to disconnect from the aircraft communications
system.
Figure 1-17. Adapter, Microphone
1-16