Textron Cessna 172R, Pilot Operating Handbook

Page: 319 / 500

GARMIN Lid.
or
its subsidiaries
c/o
Garmin International
1200
E. 151“
Street, Olathe, KS 66062 USA
AIRPLANE FLIGHT MANUAL SUPPLEMENT
or SUPPLEMENTAL AIRPLANE
FLIGHT
MANUAL
for a Garmin 400W Scries Navigation System
Section
3. EMERGENCY PROCEDURES
3.1
Emergency Procedures
No change.
3.2 Abnormal
Procedures
a) If the Garmin 400W Series unit GPS navigation
information is
not
available,
or is
invalid, utilize other remaining operational navigation
equipment installed in the airplane
as appropriate. If the 400W Series unit
loses GPS position and reverts to Dead Reckoning mode (indicated by
the
annunciation of
“DR”
in the lower left of the display), the moving
map
will continue to be displayed. Aircraft position will be based
upon
the last valid
GPS position
and estimated by Dead Reckoning methods.
Changes in airspeed or winds aloft
can affect
the estimated position
substantially. Dead Reckoning is only available in Enroulc mode;
Terminal and Approach modes do
not support
DR.
b) If a
“Loss
of Integrity” (INTEG) message is displayed during:
*
Enroutc/Tcmtinal:
continue
to navigate using
GPS
equipment and
periodically cross-check
the
GPS guidance to other approved
means of navigation.
•
GPS Approach: GPS approaches arc not authorized under
INTEG
-
Execute
missed approach or revert to alternate
navigation.
c) During a GPS LPV precision approach
or
GPS LNAV/VNAV approach,
the 400W Series unit will downgrade the approach if the Vertical alarm
limits arc exceeded. This will
cause
the vertical guidance
to
(lag as
unavailable. The
procedure
may be
continued
using the LNAV
only
minimums.
d) During a
GPS LP
approach, the
400YV Series may downgrade the
approach prior
to
the Final Approach Fix if
alarm
limits arc
exceeded. If
this occurs, a
message
will be displayed advising the pilot to use LNAV
minimums. If alarm limits
arc
exceeded after the Final Approach Fix, the
400W Series unit will flag the lateral guidance and
generate
a
system
message
“ABORT
APPROACH loss of navigation". Immediately upon
viewing
the message the unit will revert to Terminal alarm limits. If the
position integrity is within these limits lateral guidance
will be restored
190-00356-03 Rev. B
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