Section 4 – Normal procedures
ADDITIONAL GUIDANCE FOR RNAV GPS
AFMS N°D07 FOR GARMIN GFC700 AUTOPILOT AND VARIABLE PITCH PROPELLER EQUIPPED
AEROPLANES
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 approach chart should
be made including the following:
• The waypoint sequence.
• Reasonableness of the tracks and distances of the approach legs, accura cy of the
inbound course and mileage of the FAS.
• Verify from the charts, map display or CDU, which waypoints are fly- by and
which are fly-over.
• 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 accordance with
ICAO Doc 9613 Performance Based Navigation (PBN) Manual (and ICAO state Letter
SP65/4-10/53) give access to minima (on an instrument approach 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). Receiver Autonomous
Integrity Monitoring (RAIM) is a form of ABAS. Lateral guidance is linear with accu-
racy 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 in-
dication. LPV approach and annunciation on HSI is available only is SBAS available.
Before selecting a LPV approach, make sure SBAS is indicated ACTIVE in the
GPS status box on AUX-GPS STATUS page on MFD.
If DISABLED highlight the appropriate SBAS SELECTION Box under 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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