Advisory Vertical Guidance (Advisory VNAV) A Useful and Flexible Safety Enhancement. S.V. Massimini, DSc June 2011. Safety Benefits of Vertically-Guided Approaches.
S.V. Massimini, DSc
*Bregman et. al., 1997, “Safety Benefits of Precision vs. Non Precision Approaches,”
The MITRE Corporation, McLean VA . Consistent with Flight Safety Foundation 1996
study, and other analyses of safety versus vertical guidance.
Aircraft computes and flies 2.91º glide slope per the vertical path angle (VPA) on the procedure.
VPA will comply with stepdown, but pilot must ensure the altitude is met.
Pilot must level off at MDA if field is not in sight.
Note: Advisory VNAV is not generally provided on runways where GNSS-based vertical guidance is provided by other approaches
Note: Some manufacturers provide advisory VNAV using baro VNAV