User Guide

Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang
190-00494-00 Rev. B
7-6
AFCS
7.3 FLIGHT DIRECTOR MODES
Flight director modes are normally selected independently for the pitch and roll axes. Unless otherwise specified,
all mode keys are alternate action (i.e., press on, press off). In the absence of specific mode selection, the flight
director reverts to the default pitch and/or roll modes(s). Mode keys on the AFCS controller are accompanied by
annunciator lights (Figure 7-1) which are illuminated when their respective modes are armed or active.
Armed modes are annunciated in white and active in green in the AFCS Status Box. Under normal operation,
when the control for the active flight director mode is pressed, the flight director reverts to the default mode(s) for
the axis(es). Automatic transition from armed to active mode is indicated by the white armed mode annunciation
moving to the green active mode field and flashing for 10 seconds.
If the information required to compute a flight director mode becomes invalid or unavailable, the flight director
automatically reverts to the default mode for that axis. A flashing yellow mode annunciation and annunciator
light indicate loss of sensor (AHRS, ADC, IAU) or navigation data (VOR, LOC, GPS, VNV, WAAS) required to
compute commands. When such a loss occurs, the system automatically begins to roll the wings level (enters Roll
Hold Mode) or maintain the pitch angle (enters Pitch Hold Mode), depending on the affected axis. The flashing
annunciation stops when the affected mode key is pressed or another mode for the axis is selected. If after 10
seconds no action is taken, the flashing annunciation stops.
Figure 7-6 Loss of VOR Signal
The flight director is automatically disabled if the attitude information required to compute the default flight
director modes becomes invalid or unavailable.
VERTICAL MODES
The Cessna Citation Mustang’s GFC 700 AFCS offers the following vertical modes:
• Pitch Hold (default mode)— Holds the current aircraft pitch attitude; may be used to climb/descend to the
Selected Altitude
• Selected Altitude Capture — Captures the Selected Altitude
• Altitude Hold — Holds the current Altitude Reference
• Vertical Speed — Maintains the current aircraft vertical speed; may be used to climb/descend to the Selected
Altitude
• Flight Level Change (IAS and Mach hold) — Maintains the current aircraft airspeed (in IAS or Mach) while
the aircraft is climbing/descending to the Selected Altitude
• Vertical Path Tracking — Captures and tracks descent legs of an active vertical profile