Airplane Flight Manual Supplement
Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. C
Page 82 of 95
CAUTION
Turning OFF the Avionics Master Power Switch will cause the autopilot to abnormally disconnect and
the yaw damper to disconnect. An abnormal autopilot disconnect is normally annunciated visually by a
red flashing ‘AP’ in the PFD FD mode window and a continuous high-low tone. However, when the
Avionics Master Power Switch is turned OFF, electrical power is removed from the audio panels
preventing the autopilot disconnect tone from being heard.
NOTE
Pressing and holding the CWS (control wheel steering) switch on the left grip of the pilot’s
control wheel will disconnect the autopilot servos from the airplane flight controls as long
as the CWS switch is depressed. Upon release of the CWS switch, the system will
synchronize to the existing pitch and roll modes selected. Review the GFC700 Cockpit
Reference Guide for more information.
The following tables list the available AFCS vertical and lateral modes with their corresponding controls
and annunciations. The mode reference is displayed next to the active mode annunciation for Altitude
Hold, Vertical Speed, and Flight Level Change modes. The NOSE UP/DN Wheel can be used to change
the vertical mode reference while operating under Pitch Hold, Vertical Speed, or Flight Level Change
Mode. Increments of change and acceptable ranges of values for each of these references using the
NOSE UP/DN Wheel are also listed in the table.
AFCS VERTICAL MODES
Vertical Mode Control Annunciation Reference Range
Reference Change
Increment
Pitch Hold (default) PIT
20
O
Nose up
15
O
Nose Down
0.5
O
Selected Altitude
Capture
* ALTS
Altitude Hold ALT Key ALT nnnnn FT
Vertical Speed VS Key VS nnnn FPM -4000 to +4000 fpm 100 fpm
Flight Level
Change, IAS Hold
FLC nnn KT 100 to 226 kt 1 kt
Flight Level
Change, Mach
Hold
FLC Key
FLC M 0.nn M 0.25 to 0.46 M0.01
Vertical Path
Tracking (VNAV)
VNV Key VPTH
VNV Target
Altitude Capture
** ALTV
Glidepath GP
Glideslope
APR Key
GS
Takeoff (on
ground)
TO
Go Around (in air)
GA Switch
GA
* ALTS arms automatically when PIT, VS, FLC, TO, or GA is active, and under VPTH when the Selected
Altitude is to be captured instead of the VNV Target Altitude.
** ALTV arms automatically under VPTH when the VNV Target Altitude is to be captured instead of the
Selected Altitude.