Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 813

CESSNA SECTION 9 - SUPPLEMENTS
MODEL 208B 867 SHP SUPPLEMENT 12
GARMIN G1000
GENERAL
(Continued)
ENHANCED DUAL AUDIO PANEL FUNCTIONALITY
The installation of the Dual Garmin GMA 1347 audio panel includes
certain protection and system prioritization not available in the standard
single audio panel configuration. Protection against simultaneous
transmission over a single VHF COM radio and simultaneous
transmission over two different VHF COM radios are standard with the
Dual Garmin GMA 1347 audio panel installation.
Each pilot has priority when transmitting using their respective VHF
COM radio (e.g. pilot transmitting using COM1 or the copilot
transmitting using COM2) over the cross-side pilot. If the cross-side
pilot attempts to transmit on the opposite VHF radio (copilot attempting
to transmit over COM1 using audio panel number 2) the onside pilot's
push-to-talk switch will override the transmission when selected.
If both pilots have COM1 selected on their respective audio panels, the
pilot's transmission will override the copilot's transmissions. The same
priority logic applies to COM2 when the copilot transmits, it will override
the pilot's transmissions.
Additionally, the system protects against simultaneous transmission by
both pilots over COM1 and COM2. If the pilot's push-to-talk switch is
keyed while on either COM, the copilot cannot transmit on the other
COM radio. If the copilot's push-to-talk switch is keyed while on COM1,
the pilot's push-to-talk switch will have no effect on COM2.
The COM3 radio does not have simultaneous transmission protection.
If one pilot transmits on COM3, it will not interfere with the other pilot's
transmissions on COM1, COM2 or COM3. COM3 is normally reserved
for use by the HF radio option.
FAA APPROVED
208BPHCUS-S12-00 S12-5
U.S.