User Guide
Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang
190-00494-00 Rev. B
7-38
AFCS
DESCENT
While flying the arrival procedure, the aircraft is cleared for descent in preparation for the approach to KCOS.
Three methods are presented for the descent from 12,000 ft:
• Flight Level Change descent – Flight Level Change Mode can be used to descend to the Selected Altitude at a
constant airspeed. This descent method does not account for flight plan waypoint altitude constraints.
• Vertical Path Tracking descent – Vertical Path Tracking Mode is used to follow the vertical descent path
defined in the GPS flight plan. Altitude constraints correspond to waypoints in the flight plan. Before VNV
flight control can provide vertical profile guidance, a VNV flight plan must be entered and enabled.
• Non-path descent in a VNV scenario – While the flight director is following VNV guidance for descent, Pitch
Hold, Vertical Speed, or Flight Level Change Mode can be used to descend to the VNV Target Altitude prior
to reaching the planned TOD. Flight Level Change Mode is used in the example.
Flight Level Change descent:
1) Select Flight Level Change Mode:
a) Using the ALT SEL Knob, set the Selected Altitude to 10,000 feet.
b) Press the
FLC
Key to activate Flight Level Change Mode. The annunciation ‘FLC’ appears next to the
Airspeed Reference, which defaults to the current aircraft airspeed. Selected Altitude Capture Mode is armed
automatically.
c) Press the SPD Key to display the Airspeed Reference in Mach.
2) Reduce power to allow descent in Flight Level Change Mode. The autopilot maintains Mach 0.55.
3) As the aircraft nears the Selected Altitude, the flight director transitions to Selected Altitude Capture Mode,
indicated by the green ‘ALTS’ annunciation flashing for up to 10 seconds.
The green ‘ALT’ annunciation flashes for up to 10 seconds upon reaching 50 feet from the Selected Altitude; the
autopilot transitions to Altitude Hold Mode and levels the aircraft.
Figure 7-39 FLC Descent