Northern Airborne Technology AA39 - Manual (Page 24)

AA39 Series Headset Adapter
SM43 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-1
ENG-FORM: 806-0111.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Section 3 Operation
3.1 Introduction
Information in this section consists of the functional and operational procedures for the AA39 Series
Headset Adapter.
3.2 General Information
The AA39-187 is a single military headset adapter, consisting of a 5
Ω dynamic military mic to general
aviation 150
Ω amplified dynamic mic adaptor, with an 8 Ω to 600 Ω transformer for phones matching.
The AA39-287 operation is identical to the AA38-187, but is designed for two headsets.
The AA39-087 is used to adapt 5
Ω dynamic military mics (i.e. M-87) to general aviation 150 Ω audio systems.
The AA39-075 is used to adapt 75 Ω dynamic military mics (i.e. ELNO) to general aviation 150 Ω audio systems.
The AA39 Series Headset Adapters have no operator accessible controls. During installation, it may be
determined that internal level adjustments are required. Qualified personnel only shall complete internal
level adjustments.
Section 3 ends