King Air C90GTi, Pilot Training Manual

Page: 452 / 557

Descent on the LPV approach is accomplished
using the APPR and VNAV modes on the flight
guidance panel. FMS APPR and VGP will be an-
nunciated on the PFD.
Missed approach operations are the same as
non-LPV approaches.
DEGRADED SBAS INTEGRITY
DURING LPV APPROACH
The following messages will appear any time
SBAS integrity degrades during an LPV ap-
proach. “LPV NOT AVAILABLE” will display
on the CDU and, if applicable, “USE LNAV
MINIMUM” will display on the CDU and MFD
(Figure 16A-11). Additionally, the PFD will
display a flashing amber “MSG” indicating the
CDU has an active message.
“LPV NOT AVAILABLE” indicates SBAS in-
tegrity is not suff icient for the LPV approach.
Similar to an ILS with glideslope failure, a de-
cision can be made to continue the approach but
descending only to the published LNAV mini-
mum, or executing a missed approach.
“USE LNAV MINIMUM” will appear only if the
approach has an LNAV minimum published.
For approaches that do not have LNAV mini-
mums published, an “APPR NOT AVAILABLE”
message will appear and a missed approach
must be flown.
If the label “LPV APPR” was already present on
the PFD, this label will remain even though the
integrity is degraded. The amber messages must
be acknowledged and the appropriate changes
made to the approach brief ing.
With SBAS integrity degraded, the vertical de-
viation indicator will be removed when inside
the FACF and a red “VNV” label will appear in-
dicating the loss of vertical integrity. Active
VNAV modes will be removed (will change to
VPTCH) and armed VNAV modes will be lined
out as seen in the figure (Figure 16A-12). Further
descent can only be accomplished using non-
VNAV modes (e.g., VS, FLC).
KING AIR 90 SERIES PILOT TRAINING MANUAL
16A
WIDE
AREA
AUGMENT
A
TION
SY
STEM
16A-9 FOR TRAINING PURPOSES ONLY
Figure 16A-11. SBAS Failure Messages
Figure 16A-12. VNAV Flag