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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 04.10.34
Oct 05/06
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.
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