AFMS N°D01 FOR GARMIN GFC700 AUTOPILOT INSTALLATION AND
RNAV/RNP NAVIGATION ELIGIBILITY
Section 4 – Normal procedures
ADDITIONAL GUIDANCE FOR RNAV GPS
Before reaching the IAF, the flight crew should verify that the correct procedure
has been loaded into the receiver‘s route or flight plan. A comparison with the ap-
proach chart should be made including the following:
a) The waypoint sequence.
b) Reasonableness of the tracks and distances of the approach legs, accura
cy of the inbound course and mileage of the FAS.
c) Verify from the charts, map display or CDU, which waypoints are fly-
by and which are fly-over.
d) Check any map display to ensure the track lines actually ‗fly-over‘ or
‗fly-by‘ the respective waypoints in the procedure.
By the time the aircraft reaches the IAF the pilot should have completed the above
and been cleared for the approach. Also, the approach must have been activated in
the receiver at least by this time.
Approach Applications which are classified as RNP Approach (APCH) in accord-
ance with ICAO Doc 9613 Performance Based Navigation (PBN) Manual (and
ICAO state Letter SP65/4-10/53) give access to minima (on an instrument ap-
proach procedure) designated as:
LNAV (Lateral Navigation)
This is a Non-Precision or 2D Approach with Lateral only navigation guidance
provided by GNSS and an Aircraft Based Augmentation System (ABAS). Re-
ceiver Autonomous Integrity Monitoring (RAIM) is a form of ABAS. Lateral
guidance is linear with accuracy to within +/- 0.3 NM parallel to either side of the
final approach track.
LP (Localiser Performance)
This is a Non-Precision or 2D Approach with Lateral only navigation guidance
provided by GNSS and SBAS. The EGNOS is a form of SBAS in Europe. The
lateral guidance is angular with increasing sensitivity as the aircraft continues
along the final approach track; much like a localiser indication.
LPV (Localiser Performance with Vertical Guidance)
This is an Approach Procedure with Vertical Guidance. The Lateral and Vertical
guidance is provided by GPS and SBAS. Lateral and vertical guidance are angular
with increasing sensitivity as the aircraft progresses down the final approach
track; much like an ILS indication. LPV approach and annunciation on HSI is
available only is SBAS available.
Before selecting a LPV approach, make sure SBAS is indicated AC-
TIVE in the GPS status box on AUX-GPS STATUS page on MFD.
If DISABLED highlight the appropriate SBAS SELECTION Box un-
der SBAS softkey under AUX-GPS Status Page on MFD.
Should SBAS signal be lost, augmentation is lost. It may be possible to
continue with LNAV only but this is reliant on the availability of RAIM.
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