Airplane Flight Manual Supplement

Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. D
Page 66 of 117
ALTITUDE HOLD (ALT) MODE, MANUAL CAPTURE:
1. At the desired altitude...................................................PRESS ALT Button on Mode Controller
2. Green ‘ALT’........................................................................................................VERIFY on PFD
If climbing or descending, the aircraft will overshoot the reference altitude and then return
to it. The amount of overshoot will depend on the vertical speed when the ALT button is
pressed.
VERTICAL NAVIGATION (VNAV)
VNAV Descent
Vertical navigation will only function when the navigation source is GPS navigation. VNAV will
not function if the navigation source is VOR, Localizer, or ADF. The airplane’s heading must
be within 75
O
of the desired GPS course and within 10 NM cross track error in order of VNAV
to function.
VNAV functions only for enroute and terminal descents. Vertical navigation is not available
during climbs or descents between the final approach fix (FAF) and the missed approach
point (MAP). Refer to the G1000 Cockpit Reference Guide and Pilot’s Guide for additional
information.
1. Once clearance from ATC has been received ...................................RESET Altitude Preselect
to the vertical clearance limit.
2. VNV Button..............................................PRESS within 5 minutes of the top of descent (TOD)
NOTE
If the VNV button is pressed more than 5 minutes before the TOD or the altitude preselect is
not reset to a lower altitude, VPTH will begin to flash inverse video, white/black, when the
aural alert ‘Vertical Track’ annunciation sounds.
Pressing the VNV button and/or resetting the altitude preselect to a lower altitude cancels the
flashing and the AFCS will capture and track the vertical profile.
If VNV button is not pressed, or the altitude preselect is not reset to a lower altitude, VPTH
stops flashing at the TOD and the airplane will remain in ALT mode and not descend.
ALTV will be the armed vertical mode during the descent if the altitude preselect is set to a
lower altitude than the VNAV reference altitude. This indicates the autopilot / flight director
will capture the VNAV altitude reference. ALTS will be the armed mode during the descent if
the altitude preselect is set at or above the VNAV reference altitude indicating that the
autopilot / flight director will capture the altitude preselect altitude reference.