Navigation Basics

Approach GPSS Operation

When the autopilot is directed by GPSS, there are few considerations when flying an approach.

￿GPSS information will not be provided after you pass the MAP. You need to follow the directions published on the approach plate.

￿When directed to the MAHP, use the Direct-To function. GPSS information will now once again be provided to the autopilot.

￿Certain waypoints within an approach may be coded as “Fly-over” waypoints. Fly-over waypoints must be overflown before starting your turn to the next waypoint. A turn anticipation curve will not be drawn for these Fly-over waypoints. The GPSS information from your Apollo GX will handle this automatically.

GPSS Rules

There a few rules for providing valid GPSS information to your autopilot. Your autopilot should indicate when GPSS information is valid/invalid. Refer to your autopilot operating instructions for details.

Apollo GX Information￿Your ground speed must be more than 5 kts￿You are navigating to a waypoint (flight plan or direct-to)￿You are on the TO side of the waypoint￿You are not executing Missed Approach proceduresAutopilot Information

￿Horizontal bank output from the Apollo GX to the autopilot is limited to 30° or less

￿Turn rate is 3°/sec at speeds less than 250 kts Turn rate is 1.5°/sec at speeds greater than 250 kts

3-38