Northern Airborne Technology AMS43 - Manual (Page 23)

AMS43 Single Channel Audio Controller
SM59 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-3
3.3.3 ICS Functions
Mode switch VOX Squelch
Control
ICS Mode
switch
ICS Volume Control
3.3.3.1 ICS Modes
ICS audio may be implemented in three modes: LIVE (on constantly), VOX (voice activated), or KEYED
(active only when switched by ICS PTT switch). It is common to use the LIVE mode during ground
operations, start-up, etc. and to use VOX or KEYED operation if conditions are so noisy that ‘pilot fatigue’
will result.
LIVE (Hot Mic Operation)
ICS mode switch (orange switch bat) set to the VOX (up) position and the VOX squelch control
set to the full counter-clockwise position.
KEYED ICS (PTT Operation)
ICS mode switch (orange switch bat) set to the KEY (down) position. Keyed ICS is inherent to
the pilot and copilot microphone circuits only. Passenger microphone circuits will be LIVE with
this mode selected.
VOX (Voice Activated)
ICS mode switch (orange switch bat) set to the VOX (up) position. Set the ICS VOX Squelch
control fully counter-clockwise and then slowly rotate clockwise until the ICS just becomes quiet.
This setting will vary with ambient noise conditions, and the quality and number of microphones
connected in the system.
3.3.3.2 General ICS Functions
Passenger ICS audio is LIVE when the controller is in the LIVE or KEYED mode of ICS operation. In the
KEYED mode of operation the passenger microphones are LIVE. Utilize drop cord assemblies
incorporating microphone circuit interrupt switches for keyed ICS operation. Passenger ICS is VOX
triggered when VOX mode is selected.
All ICS audio is controlled by the front panel ICS volume control and may be varied to suit conditions.
The ICS VOL control provides adjustment from approximately 1% to full output.
The mode switch (red switch bat) is used to select between NORMAL and PILOT ISO/EMR modes. In
the NORMAL position (down), all operations of the ICS are functional as described above. When the
switch is in the PILOT ISO/EMR position, the pilot is isolated from the rest of the passengers. If the
controller is operated in the ISO/EMR mode, ICS operation will continue (if there is no fault condition)
between the passengers and copilot, but will exclude the pilot. See section 3.4 for further details.
ENG-FORM: 806-0111.DOT
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