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Pitch Mode
Pitch mode (PTCH) is the basic vertical operating mode, and is automatically selected when no
other vertical mode is active and the flight director is on. A green PTCH annunciation appears in
the vertical active field of the FMA when pitch mode is active.
When PTCH mode is active, the FCC generates commands to maintain the aircraft’s pitch angle
reference. The pitch angle reference value may be adjusted by rotating the VS/pitch wheel on
the FCP in the desired direction. Each click of the wheel results in 0.5 degrees of pitch attitude
change.
NOTE
All flight director vertical modes reset to PTCH mode when the
VS/pitch wheel is rotated, except if vertical speed (VS) or glideslope
capture (GS) modes are active. VS/pitch wheel rotation has no effect
after glideslope capture.
The pilot may also adjust the pitch reference to a desired pitch angle by pushing the FD SYNC
button, and manually setting a pitch angle between +20 to –10 degrees. If the pilot selects a
pitch angle greater than the maximum limits, the FD will generate commands to return the pitch
angle to within limit upon release of the FD SYNC button.
Pitch mode is automatically cleared by selection or capture of another vertical mode.
Pitch Mode
Figure 04−10−28
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−33
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FLIGHT DIRECTORS (CONT'D)
Altitude Preselect Mode
The altitude preselect mode (ALTS) causes the flight director to generate commands to capture
and level off at the preselected altitude. It is comprised of armed, capture and track states.
Altitude preselect mode commands are based on the coupled side barometric altimeter.
The preselected altitude is set by the ALT knob on the FCP, and is displayed as a cyan digital
readout on the top right corner of the PFDs, and by a cyan altitude (double-bar) bug on the
barometric altimeters.
The ALTS mode is automatically armed upon selection of any vertical mode, except altitude
hold (ALT), vertical approach (GS or VGP), or go-around (GA) modes. When ALTS mode is
armed, the FCCs calculate the capture point for the preselected altitude, while operating in the
current active vertical mode. The capture point is a function of closure rate, with the capture
point occurring earlier for high closure rates. A white ALTS annunciation appears in the vertical
armed field of the FMA when altitude preselect mode is armed.
When the airplane is in a position to capture the preselected altitude, the system generates
commands to level off (capture) and track the preselected altitude. During the altitude capture
sequence, a green ALTS CAP annunciation is displayed in the vertical capture field of the FMA,
and the armed annunciation is removed.
When the capture (level-off) is completed, the flight director generates commands to track the
preselected altitude. A green ALTS annunciation remains displayed in the vertical capture field
of the FMA.
NOTE
If the preselected altitude is changed during altitude capture, the
ALTS CAP display is replaced by ALT, and a yellow ALTS
annunciation is temporarily displayed in the vertical armed field of the
FMA. The FCCs will continue to capture and track the original
preselected altitude displayed while ALTS CAP was active.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−34
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FLIGHT DIRECTORS (CONT'D)
Altitude Capture Sequence
Figure 04−10−29
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−35
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FLIGHT DIRECTORS (CONT'D)
Altitude Alert System
The altitude alert system provides aural and visual indications of preselected altitude capture
and tracking. It also provides aural and visual indications of altitude deviations from the
preselected altitude (ALTS).
The altitude alerting system processes data from the air data computers (ADCs), and is
independent of the flight director or autopilot modes. Altitude alert annunciations are based on
the baro-corrected altitude of the coupled side altimeter.
Capture Alert
At 1,000 feet prior to the preselected altitude, the preselected digital readout and bug flash,
and an aural tone (C-chord) sounds.
Deviation Alert
If the aircraft deviates by more than 200 and/or 1,000 feet from the preselected altitude, the
altitude bugs and digital readout flash yellow, and an aural tone (C-chord) is heard.
Altitude alerts can be canceled by pushing the PUSH CANCEL inset of the ALT knob, or by
　
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