SUPPLEMENT 69
BARO--VNAV APPROACHES
T B M
850
Edition 1 -- September 30, 2018
Rev. 0
Page 9.69.15
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 conduct 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
glide--path when SBAS is not available or allowed.
Final Approach Segment (FAS)
Altimeter systems assume an ISA temperature model.
When actual atmosphere deviates from the ISA model it results in altitude
errors.
For example, performing a Baro--VNAV during a hot day would result in
guidance relative to a glide path angle steeper than the published glide path
angle. On the contrary, during a cold day, a Baro--VNAV would be based on
guidance relative to a glide path smoother than the published glide path
angle.
The approach plates indicate a temperature range for which the approach
has been designed.
Within this temperature range the LNAV/VNAV can be used with
uncompensated Baro--VNAV systems.
Outside of this temperature range, LNAV/VNAV minimums shall not be used
with uncompensated Baro--VNAV systems.
PIM - DO NOT USE FOR FLIGHT OPERATIONS
Summary of Contents for TBM 850
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