scope:

Scope and Function

This document describes the aircraft industry recommendations for a handheld microphone and boom microphone for use with airborne radio installations. This document, ARINC Characteristic 538C, is in addition to and does not supersede the older ARINC Characteristic 538B: Hand-Held Microphone, dated February 16, 1983.

Microphones of many design variations are used by pilots with satisfactory results. This ARINC Standard does not prescribe a particular design nor does it imply that the design outlined herein constitutes the only satisfactory microphone.