Northern Airborne Technology AMS42 - Manual (Page 61)

SM19 Rev. 4.00 AMS42/44 Dual Channel Audio Controller Manual
Nov 21, 2003 Page 3-7
ENG-FORM: 806-0102.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.7 AMS44 - General Operation
The AMS44 provides one central controller for all the aircraft audio, allowing selection of
transmit and receive audio, LIVE, PTT (Keyed), or VOX intercom, interface for an
additional handheld transmit microphone (hand mic), and pilot/copilot isolation/
emergency operation. Typical definition of the unit has the ‘pilot’ on the right side of the
controller, and the ‘copilot’ and passengers on the left side. This can be easily re-
configured at the time of installation for alternate seating arrangements.
Individual control over receive and transmit functions are provided for both the pilot and
copilot (observer), and a common control is provided for LIVE, PTT and VOX ICS
operation. An additional control is provided for NORMAL, EMERGENCY, or ISOLATE
(pilot cut off from ICS audio) operation.
Sidetone (S/T) level is adjustable internally, and Receive (RX) and Intercom (ICS) levels
are adjustable on the front panel. All audio, except the S/T of the radio IN USE and any
Type ‘B’ DIRECT AUDIO input signals, are muted during transmit for clarity. ICS
operation allows transmit during any ICS mode by using the PTT switch.
3.8 AMS44 - Audio Alerting Functions
No internal audio alerting is provided in the AMS44. Two direct (unswitched) inputs are
provided to allow airframe alerting signals to be routed to the pilot. See 3.10.5 (Auxiliary
Inputs) for more information.
DIR AUD #1 is amplified by the Audio controller, and can not be heard when the Mode
Switch is in the EMER position. DIR AUD #2 is not amplified, and is audible at all times.