LNAV/VNAV approaches add published vertical guidance in addition to LNAV
guidance. They are different from LNAV+V in that the vertical deviations are not
advisory, but serve instead as published guidance.
The minimums of an LNAV/VNAV approach represent a DA rather than a MDA.
Execution of an LNAV/VNAV approach does not require SBAS integrity as long as
a system is configured to support barometric VNAV for approach.
If SBAS integrity is available, it will be used to provide vertical guidance.
During execution of a GPS approach with LNAV/VNAV service levels while the
airplane is between the FAF and MAP, excessive deviation indicators appear as
white vertical lines to indicate an area where the vertical deviation exceeds ±75
feet.
If the glide-path indicator is within an area of excessive deviation, the glide-path
indicator becomes yellow and the vertical lines also become yellow.
RNAV (GPS) or RNAV (GNSS) –
LPV
LPV approaches provide both localizer precision lateral guidance and a vertical
path definition.
SBAS integrity is required to execute the approach.
Baro-VNAV Approaches
The GIFD provides the ability to perform barometric based VNAV operations while
conducting certain GPS approaches using an automatically-generated
temperature-compensated glidepath.
Baro-VNAV approach functionality is separate and distinct from enroute and
terminal descent VNAV functions.
Temperature Compensation
If SBAS is unavailable or disabled, the GIFD will provide automatic temperature
compensated glidepath vertical guidance on approaches that have LNAV/VNAV
minima published, or on some approaches that are not authorized for SBAS.
No pilot action is required to receive the temperature compensated glidepath when
SBAS is not available or allowed.
Final Approach Segment (FAS)
Altimeter systems follow the ISA temperature modelling.
When actual atmospheric conditions deviate from the ISA model, errors in altitude
will occur.
Section 7
Description
Pilot's Information Manual
PIM TBM 960 - Edition 0
Rev. 01
Page 7.15.10
PIM - DO NOT USE FOR FLIGHT OPERATIONS
