3.2.2 GPS APPROACH DOWNGRADE
During a GPS LPV, LP +V, LNAV/VNAV, or LNAV +V approach, if GPS
accuracy requirements cannot be met by the GPS receiver, the GTN will
downgrade the approach. The downgrade will remove vertical deviation
indication from the VDI and change the approach annunciation accordingly
from LPV, LP +V, L/VNAV, or LNAV +V to LNAV. The approach may be
continued using the LNAV only minimums.
During a GPS approach in which GPS accuracy requirements cannot be met by
the GPS receiver for any GPS approach type, the GTN will flag all CDI
guidance and display a system message "ABORT APPROACH-GPS approach
no longer available". Immediately upon viewing the message, the unit will
revert to Terminal navigation mode alarm limits. If the position integrity is
within these limits lateral guidance will be restored and the GPS may be used to
execute the missed approach, otherwise alternate means of navigation must be
utilized.
3.2.3 LOSS OF COM RADIO TUNING FUNCTIONS
If alternate COM is available:
Communications ........................................................ USE ALTERNATE COM
If no alternate COM is available:
COM RMT XFR key (if installed)....... PRESS AND HOLD FOR 2 SECONDS
This procedure will tune the active COM radio the emergency
frequency 121.5, regardless of what frequency is displayed on
the GTN. Certain failures of the tuning system will
automatically tune 121.5 without flight crew action.
3.2.4 LOSS OF AUDIO PANEL FUNCTIONS (GMA 35 Only)
Audio Panel Circuit Breaker ........................................................................ PULL
This procedure will force the audio panel into fail safe mode
which provides only the pilot with communications and only
on a single COM radio. If any non GTN 750 COM is installed,
communication will be only on that radio. If only a GTN 750
is installed in the aircraft, then the pilot will have only the
GTN 750 COM available. No other audio panel functions
including aural alerting and the crew and passenger intercom
will function.
† Includes GMA 35 and GMA 35c Audio Panels
AFMS, Garmin GTN GPS/SBAS System
FAA APPROVED
NOTE
NOTE
†
190-01007-A2 Rev. 6
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