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FLIGHT DIRECTORS (CONT'D)
Vertical Speed Mode
The vertical speed mode (VS) generates commands to maintain a vertical speed reference
value.
Pushing the VS button on the FCP selects the vertical speed mode. A green VS annunciation is
displayed in the active vertical field of the FMA, and ALTS mode is automatically armed to
capture the preselected altitude.
The VS reference value will default to the existing vertical speed at the moment of mode
selection. The VS reference value will also reset to the existing vertical speed whenever the
autopilot is engaged and VS mode is active.
The VS reference may be changed by rotating the VS/pitch wheel in the desired direction. The
VS reference changes by ±100 fpm per click. The selected vertical speed reference is displayed
on the vertical speed scale as a magenta triangular bug, and as a magenta digital readout
above the scale.
The pilot may adjust the VS reference by pushing the FD SYNC button while maneuvering the
airplane to a new VS reference. The FD will generate commands to maintain the new VS
reference upon release of the FD SYNC button.
Vertical speed mode is cleared by:
• Pushing the VS button on the FCP,
• Selecting another vertical mode, or
• Capturing an armed vertical mode.
Vertical Speed Mode
Figure 04−10−32
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−36
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Flight Level Change Mode
Flight level change mode (FLC) generates commands to maintain either the airspeed/Mach
reference value, or a 100 ft/min vertical speed toward the preselected altitude, whichever yields
the greater closure rate to the preselected altitude.
Pushing the FLC button selects flight level change mode. A green FLC annunciation is
displayed in the active vertical field of the FMA, and ALTS is automatically armed to capture the
preselected altitude.
When FLC mode is selected manually, or by the FMS, the airspeed/Mach reference displayed
on the PFDs (speed bug) is automatically set to the aircraft’s current airspeed/Mach. The
airspeed/Mach reference is also synchronized to the aircraft’s current airspeed/Mach when the
autopilot is engaged with the active vertical mode in FLC. The airspeed/Mach reference can be
manually adjusted using the SPEED knob on the FCP.
Automatic transition between IAS and Mach airspeed reference occurs at 33,600 feet MSL.
Mach reference automatically selects when the airplane climbs through 33,600 feet MSL and
IAS reference automatically selects when the airplane descends through 33,600 feet MSL.
FLC mode is cleared by:
• Pushing the FLC button,
• Selecting another vertical mode, or
• Capturing an armed vertical mode.
Flight Level Change Mode
Figure 04−10−33
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−37
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
FLC Overspeed Protection Mode
The FCCs incorporate an overspeed protection mode to limit the aircraft indicated
airspeed/Mach from exceeding VMO/MMO. Overspeed protection is applied with the flight
directors off, and in any active vertical flight director mode except GS, ALTS or ALT.
FLC overspeed mode is activated automatically in the event of an overspeed condition; when
the airspeed is 10 KIAS above VMO or Mach number is 0.015 M above MMO. When FLC
overspeed mode is active, a flashing yellow FLC annunciation is displayed in the active vertical
field of the FMA. The flight directors, if not in view, automatically appear and provide pitch
commands to reduce airspeed 5 knots below VMO or 0.02 Mach below MMO. FLC overspeed
mode is automatically cleared when this airspeed/Mach reference is reached. The vertical
mode will revert to FLC mode when the FLC overspeed mode is cleared.
NOTE
FLC overspeed mode cannot be cleared by pressing the FLC
button. As well, the flight directors cannot be selected off during
FLC overspeed mode operation.
FLC Overspeed Protection Mode
Figure 04−10−34
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−38
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Vertical Takeoff Mode
On the ground, pushing either TOGA (takeoff/go-around) button, mounted on the thrust levers,
selects the takeoff mode and clears all other vertical modes. Lateral and vertical takeoff mode
(TO) selections are coincident. During takeoff mode, the flight directors operate in dual
　
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