Specifications

SECTION III
MODEL 560 INSTRUMENTATION AND AVIONICS
ALTITUDE HOLD (ALT) AND ALTITUDE PRESELECT (ASEL)
Selecting altitude hold (ALT) provides steering commands to maintain the altitude at the moment of
engagement. An altitude preselect (ASEL) mode is also incorporated which provides a preprogramming
capability. To use altitude preselect, the desired altitude is set into the ALT window at the lower right
corner of the multifunction display (MFD) by means of the knob on the bottom right of the MFD bezel.
ASEL will illuminate in white in the top right side of the EADI to indicate that the altitude preselect mode is
armed. The airplane may be maneuvered toward the desired altitude using any of several methods: the
autopilot pitch wheel, touch control steering, FD pitch sync, speed hold or vertical speed hold. 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; i.e., at 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 EADI. 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 EADI. 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
EADI. When initially selecting speed mode, the speed target will synchronize to the existing indicated
airspeed for altitudes below 28,600 feet, and will synchronize to the existing Mach number for altitudes
above 27,900 feet. The target will automatically switch from indicated airspeed to Mach number as the
airplane climbs through 28,600 feet or greater than 0.62 Mach. It will automatically switch from Mach
number to indicated airspeed as the airplane descends through 27,900 feet or if the Mach goes below 0.61.
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. If the autopilot is engaged after VS mode is
selected, the vertical speed must be resynchronized.
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 M
MO
, 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 M
MO
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).
I 56OMB-01 Configuration AA 3-45