Garmin GPS 155XL Pilot's Manual & Reference

Also see for GPS 155XL: Maintenance manual Installation manual Installation manual

When the aircraft is within 30 nautical miles of the destination airport, the GPS155XL will automatically arm the approach, and the GPS APR switch will indicate an‘ARM’ status.To fly the GPS approach (without radar vectors):1. Confirm that the GPS APR switch indicates an ‘ARM’ status. The CDI scale will begin asteady transition from the 5.0 nm to the 1.0 nm scale as you make your way to the FAF. Ifthe approach has been disarmed and the aircraft is within 3 nm of the FAF, the GPS 155XLwill prompt you to re-arm the approach.2. The GPS 155XL will automatically sequence to each waypoint in the approach, with CDI,course and timing guidance to each waypoint. For each waypoint in the approach, the GPS155XL’s turn anticipation and waypoint alerting features will provide three pilot cues:a. The waypoint annunciator will flash approximately 15 seconds before reaching theturning point for each approach waypoint, and glow steadily approximately 2 secondsprior to the turn anticipation point.b. The ‘Next dtk’ prompt will flash in the CDI field when the ‘WPT’ annunciator beginsflashing. Set the HSI course select to the next dtk value when the waypoint annuncia-tor starts flashing. Start the turn when the annunciator glows steadily.c. The To/From indicator flag on the GPS CDI will flip momentarily to indicate you havetransitioned to the next approach leg.For more information on turn anticipation and waypoint alerting, please refer to Section 4.3. If a procedure turn is required:a. 2 miles prior to crossing the waypoint outbound, set the GPS SEQ switch to HOLD.b. At the waypoint, set the outbound course on the HSI.c. Fly the procedure turn. After the procedure turn outbound, set the inbound course onthe HSI.d. On the inbound intercept to the final course, fly to center the CDI.(continued on next page)82SECTION5 APPROACH NAVFlying theApproachThe ‘Next dtk’ prompt will flash to indicate thedesired course for the leg of the approach route.Set the HSI course select to the next dtk valuewhen the waypoint annunciator starts flashing.The GPS APR switch will indicate ‘ARM’ when theapproach is armed. This will begin automatic CDIscale transitioning from 5.0 nm to 1.0 nm as youmake your way to the FAF.