Leaderboard

Unlike other aircraft types in the Collins auto flight system VNAV is a modifier on the standard vertical modes (VS, FLC, etc.). It basically instructs the system to respect altitude constraints in the flight plan, and if enabled, use speed targets from the FMS. When descending in VPATH on an arrival and initial approach, similar to an ILS, once the plane is flying towards the final approach point for the RNAV/RNP then one can push the APPR button and VGP will arm/capture. Once active the plane will descend on the final glide path below the preselected altitude. Hope that helps.