Northern Airborne Technology AMS42 - Manual (Page 65)

SM19 Rev. 4.00 AMS42/44 Dual Channel Audio Controller Manual
Nov 21, 2003 Page 3-11
ENG-FORM: 806-0102.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.10.5 Auxiliary Inputs
Two Direct Audio inputs are available. They are coupled directly to either the left or right
side of the controller at the time of installation. The Direct Audio inputs are normally
selected for the right side of the controller when the unit is shipped from the factory.
3.11 AMS44 - Intercom Functions
All ICS audio is controlled by the front panel ICS volume controls and may be varied to
suit conditions. There are independent volume controls for the left and right sides of the
controller. The ICS VOL are the larger, aft controls of the dual concentric volume
control assemblies. See also section 3.10.3.2.
If the controller is operated in the emergency mode, ICS operation will continue (if there is no
fault condition) between the passengers, but not between the pilot and copilot or passengers.
3.11.1 ICS Modes of Operation
Intercom system (ICS) audio may be implemented in three modes between users; LIVE
(on constantly), VOX (voice activated), or PTT (active only when switched by ICS PTT
switch). The ICS mode is selected by the control (labeled ICS) in the middle of the top
switch row. It is common to use the LIVE mode during ground operations, start-up, etc.,
and to use VOX or PTT operation if conditions are so noisy that ‘pilot fatigue’ will result.
ICS Mode Control
The desired ICS mode is selected by the ICS mode control knob.
PTT ICS (KEYED Operation)*
ICS Mode Control set fully counter-clockwise into the switch detent.
LIVE (Hot Mic Operation)
ICS Mode Control set fully clockwise.
VOX (Voice Activated)
ICS Mode Control set fully clockwise, then slowly rotated counter-clockwise until the
intercom just becomes ‘quiet’. This setting will vary with ambient noise conditions, and
the quality and number of microphones connected in the system.
* KEYED operation is inherent to the pilot and copilot microphone circuits only.