GARMIN Ltd. or its subsidiaries
c/o Garmin International
1200 E. 151
st
Street, Olathe, KS 66062 USA
AIRPLANE FLIGHT MANUAL SUPPLEMENT
or SUPPLEMENTAL AIRPLANE FLIGHT MANUAL
for a Garmin 400W Series Navigation System
190-00356-03 Rev. B
Page 14 of 16
4.2
Approaches without Vertical Guidance
The 400W Series unit supports Localizer Performance approaches
(annunciated as LP). Published LP minimums will be controlling in this
case.
NOTE:
If flying an LP approach, be prepared to fly the LNAV only
approach prior to reaching the final approach fix (FAF). If the
GPS integrity is not within LP approach limits, the system will
notify the pilot by a downgrade to LNAV message.
For additional information on LP approaches refer to the 400W Series unit
Pilot’s Guide.
4.3
Autopilot Operation
The Garmin 400W Series may be coupled to an optional autopilot if installed
in the aircraft when operating as prescribed in the LIMITATIONS section of
this manual. For lateral guidance, some installations may utilize GPSS or
GPS Roll Steering in lieu of the analog deviation information. If an HSI is
used with GPSS engaged, the pilot should rotate the course pointer as
prompted on the 400W Series unit to prevent loss of situational awareness
and to prevent the aircraft from turning inappropriately if the autopilot is
switched from digital (GPSS) to analog mode. For autopilot operational
instructions, refer to the FAA approved Flight Manual or Flight Manual
Supplement for the autopilot.
4.4
Coupling the Autopilot during approaches
The Garmin 400W Series supports analog and digital (GPSS) control
interfaces to an optionally installed autopilot. Some autopilots revert to
ROLL mode (wings level) and/or flag a NAV failure if the digital data
becomes unavailable or is inhibited. The CDI selection of VLOC should
inhibit the digital control interface. When switching between GPS and
VLOC the pilot should be aware that the autopilot may need to be re-
engaged into APR or NAV mode after changing the CDI source.
Autopilot coupling to GPS vertical guidance requires that the autopilot be
engaged in an analog APR mode identical to coupling to an ILS. Some
autopilots may revert to ROLL mode when the navigation outputs of the
400W Series unit sequence to the final approach fix. In these installations
