2.8 RADIO STATUS
When a microphone is keyed, a white TX indication
appears between the active COM frequency and the
standby COM frequency to indicate that a transmission
is in progress. The TX indication disappears once COM
transmission is completed.
When a COM signal is received, a white RX indication
appears to the right of the active COM frequency to indi-
cate that a COM signal reception is in progress. The RX
indication disappears once COM signal reception is over.
Figure 2-6 Radio Status Indications
!
NOTE: If a signal is transmitted or received on
a COM radio for which frequency toggling is
enabled (i.e., on which the tuning box is located),
the Frequency Toggle Arrow disappears and
is replaced by a TX or an RX indication, respec-
tively.
2.9 EMERGENCY FREQUENCY
(121.500 MHZ)
If data for the selected COM frequency is not received
for a duration of one second, a communication failure is
assumed by the system and the selected frequency is auto-
matically changed to the emergency frequency (121.500
MHz).
Figure 2-7 Communication Failure
190-00302-01 Page Rev. 1
G1000_COM-NAV_PG.indd 7
!
Quickly Tuning and Activating 121.500 MHz
Pressing and holding the COM Frequency Toggle key
for approximately two (2) seconds automatically loads the
emergency COM frequency (121.500 MHz) in the active
frequency fi eld of the COM radio for which frequency
toggling is enabled.
2.10 STUCK MICROPHONE
If the COM1 (or COM2) Remote Transfer key be-
comes stuck, an alert appears on the PFD to advise the
crew of a stuck COM microphone. Transmit capability is
reset after 35 seconds of continuous transmitting.
Garmin G1000 VHF NAV/COM Pilot's Guide
OPERATION – NAV
NOTE: In the event of a dual CDU failure, the
emergency frequency (121.500 MHz) automati-
cally becomes available to the pilot through the
pilot headset.
Figure 2-8 Quickly Tuning 121.500 MHz
Figure 2-9 Stuck MIC Alert
Garmin Proprietary
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