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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.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−31
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
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 04−10−32
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Altitude Capture Sequence
Figure 04−10−29
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−33
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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
selecting a new preselect altitude.
Altitude alerts are inhibited if the glideslope (GS) or FMS glide path (VGP) is captured.
Altitude Alert Annunciations
Figure 04−10−30
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−34
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
FLIGHT DIRECTORS (CONT'D)
Altitude Hold Mode
Altitude hold mode (ALT) generates commands to maintain the pressure altitude at the time of
selection. Altitude hold mode commands are based on the baro-corrected altitude of the coupled
side barometric altimeter. When active, a green ALT annunciation appears in the active vertical
field of the flight mode annunciator.
Altitude hold mode is activated by pushing the ALT button on the FCP, or by changing the
preselected altitude while in altitude select track mode (ALTS active).
Altitude hold mode is inhibited whenever glideslope (GS) mode is active.
NOTE
If the ALT button on the FCP is pushed during a climb or descent, it
is possible for the aircraft to temporarily overshoot the desired
altitude while the FCCs compensate for the aircraft’s vertical speed
at the moment of ALT mode selection.
The pilot may adjust the altitude reference by pushing the FD SYNC button and manually flying
to the desired altitude. The FD will generate commands to maintain the new altitude reference
upon release of the FD SYNC button.
Altitude hold mode may be cleared by:
• Pushing the ALT button,
• Selecting another vertical mode, or
• Capturing an armed vertical mode.
Altitude Hold Mode
Figure 04−10−31
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−35
REV 74, Nov 07/08
CL−604 Operating Manual
PSP 604−6
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庞巴迪挑战者604操作手册 Operating Manual 3(45)
