If the airplane is flown manually, the flight director will guide the pilot onto the selected altitude. As
the airplane approaches the desired altitude, the altitude preselect will capture at an altitude
corresponding to approximately 1/5 the rate-of-climb/descent. For example, at a 2000 feet/minute
climb rate, the system will capture approximately 400 feet prior to the selected altitude.
At capture, the mode ASEL will illuminate in green on the ADI. The flight director will perform a
smooth level-off at the selected altitude. At level-off altitude, ALT mode will be automatically selected
and displayed in green on the ADI. Once altitude hold is captured, the touch control steering (TCS)
button on the control wheel can be used to change or trim the selected altitude. TCS operates in
conjunction with the flight director or the autopilot or both. Once ALT mode is engaged, resetting the
BARO setting on the pilot's altimeter will cause the airplane to climb or descend to recapture the
same indicated altitude. Moving the autopilot pitch wheel will cause ALT or ASEL CAP modes to be
canceled if either is selected.
Selection of a vertical mode without a lateral mode will provide autopilot tracking of the mode but the
FD command bars will not be in view.
FLIGHT LEVEL CHANGE HOLD AND VERTICAL SPEED HOLD
Flight Level Change (FLC) Hold (IAS or MACH - mode selectable depends upon altitude) and
vertical speed (VS) hold are selected by pressing the appropriate mode button (FLC or VS) on the
MS-560 Flight Director Mode Control Selector. The flight director, autopilot, or both will hold the
airspeed, (Mach if appropriate), or vertical speed indicated at the moment of engagement. The green
light in the respective mode selector button will illuminate and VS or IAS (or Mach), as appropriate,
will illuminate in green on the ADI. When initially selecting speed mode, the speed target will
synchronize to the existing indicated airspeed for altitudes below 29,000 feet or at speeds less than
0.560 Mach, and will synchronize to the existing Mach number for altitudes above 29,000 feet or at
speeds greater than 0.620 Mach. The target will automatically switch from indicated airspeed to the
equivalent Mach number as the airplane climbs through 29,000 feet or exceeds 0.620 Mach. It will
automatically switch from Mach number to the equivalent indicated airspeed as the airplane
descends through 28,800 feet and decreases below 0.610 Mach. Upon initially selecting vertical
speed hold mode, the vertical speed will synchronize to the existing vertical speed. Once the vertical
speed mode is selected with the autopilot engaged, the pilot can select a different vertical speed with
the pitch wheel on the autopilot controller (within the minimum/maximum limits). If the autopilot is
engaged after VS mode is selected, the vertical speed must be re-synchronized.
The autopilot pitch wheel may be used to change the reference speeds for both the speed mode and
the vertical speed mode. The touch control steering (TCS) button may also be used to temporarily
release the autopilot clutches and maneuver the airplane to a new reference. The airspeed, Mach, or
vertical speed established when the (TCS) button is released will become the new reference.
A predetermined lower limit has been established, below which the FLC mode will not engage. At the
opposite end of the speed spectrum, V
MO or MMO, as appropriate, will not be exceeded. If an upper
limiting speed is attained the system will maintain the limiting speed, thus speed hold mode can be
used to fly V
MO or MMO descents.
Selection of the flight level change mode will cancel all other vertical modes except altitude preselect
arm (ASEL - green annunciation) and glide slope arm (GS - green annunciation).
Cessna Citation XLS - Instrumentation & Avionics
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