Northern Airborne Technology AA83-001 rev.4.00 - Manual (Page 38)

AA83-001 InterMUSIC™ Stereo Intercom System Manual SM09-2A Rev. 4.00
3.3.5
MODE Control
MODE Switch
The mode control is a three-position toggle switch used to select the operational mode
of the unit. The selectable positions are SPLIT, PIL ISO and NORMAL. These modes
are described fully in sections 3.3.5.1, 3.3.5.2 and 3.3.5.3 below.
3.3.5.1 NORMAL Operation
In normal use, the AA83-001 serves as a common intercommunication system for up to four
users, and a flow-through interface for connection to the ship's external communication
system. The NORM mode (default) permits everyone on the system to talk to each
other, listen to music, and hear all radio communications.
Radio transmit functions may be initiated by either the pilot or the copilot. The pilot has
priority.
In NORM mode, external tie line users are included in the ICS communications.
3.3.5.2
PIL ISO (Pilot Isolation) Operation
In normal operation, the pilot, copilot, and passengers hear the same signals from the
aircraft communication system. Sometimes this is not desirable from the pilot's
perspective, for instance during communication with the tower on approach, or when
discussions on the intercom would be a distraction. Many times the copilot position is
simply another passenger, and the pilot may wish to be isolated from them.
PILOT ISO mode separates the pilot from the intercom network, allowing confidential
radio communications without interference from the copilot or passenger intercom or
music. The pilot has no ICS operation, and all signals are presented in mono format
during this mode. All other users are unaffected and continue to use the
entertainment and intercom functions of the AA83-001.
While in PILOT ISO mode, the pilot maintains complete control of all the radio
functions of the intercom, and the pilot mic and TX keyline are directly connected to
the transceiver. The pilot phones are driven by the transceiver.
Page 3-4 Feb 8, 2006
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