Northern Airborne Technology AMS42 - Manual (Page 66)

AMS42/44 Dual Channel Audio Controller Manual SM19 Rev. 4.00
Page 3-12 Nov 21, 2003
ENG-FORM: 806-0102.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.11.2 Passenger ICS Operation
Passenger ICS audio is LIVE when the controller is in the LIVE or PTT mode of ICS
operation and are VOX triggered when a VOX setting is selected. Note that the
passengers are always LIVE unless interrupted by an in-line PTT cord, or the controller
is set for VOX operation.
Passenger and copilot (observer) operations can be maximized by using PTT type cord
assemblies designed for use with NAT audio controllers.
CAUTION: Ensure that all PTT type cord assemblies have properly shielded mic and
phone wiring, or ‘crosstalk’ will occur.
3.12 AMS44 - Mode Control
Mode Control Switch
The Mode Control switch is a three-position, locking toggle switch that is used to select
between ISO, EMER OPER, and NORM. It is identified with a red cap.
3.12.1 Emergency Operation
The center (EMER OPER) position of the mode switch places the controller into the
emergency operation mode. When switched to the EMER OPER position, both pilot and
copilot controls are removed from the ICS bus and connected directly to their respective
radios. This mode should be selected in the event of a box fault or power failure.
The Emergency function should be tested prior to flight to assure proper operation and
allow the radio levels to be set adequately for emergency operation.