Northern Airborne Technology AA95-766 - Manual (Page 33)

SM95-766 Rev. 2.00 AA95-766 Single Channel Audio Controller Manual
3.3.3
ICS Functions
The ICS controls consist of the VOX and ICS
controls, which are rotary knobs, and the ICS
VOX / KEY control, which is an orange two-
position toggle switch. The function of these
controls is outlined below.
Intercom audio may be implemented in three modes: LIVE (on constantly), VOX (voice
activated), or KEYED (active only when switched by ICS PTT cyclic or foot 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 up (VOX) position and the VOX
squelch control set to the full counter-clockwise position.
KEYED ICS (PTT Operation)
ICS toggle switch (orange switch bat) set to the down (KEY) 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 toggle switch (orange switch bat) set to the up (VOX) position. Set the ICS
VOX Squelch control fully counter-clockwise and then slowly rotate 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.
3.3.3.1 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. In multiple station systems, the ICS volume adjusts only the incoming ICS audio
level. 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 ISO/EMR
modes. In the NORMAL position (down), all operations of the ICS are functional as
described above. When the switch is in the ISO/EMR (pilot isolate/emergency 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.
Dec 6, 2004 Page 3-3
ENG-FORM: 806-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.