Meggitt S-TEC Fifty Five X, Руководство по эксплуатации для пилотов

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3-14 1st Ed. Jul 15, 06
S–TEC
3.1.6 Altitude Pre-Select Function
The Altitude Pre-Select Function allows the pilot to pre-select a target altitude
and the vertical speed (if within the aircraft's capabilities) at which the aircraft will
climb or descend, until that altitude is captured.
Engage a roll mode (HDG, NAV, APR, GPSS, REV). Set the PFD Alt Bug to the
target altitude and the PFD VSI Bug to an acceptable vertical speed. Press
and hold the VS mode selector switch, and press the ALT mode selector
switch to engage the vertical speed mode and arm the altitude hold mode.
ALT and VS annunciations will appear as shown in Fig. 3-19. If within the
aircraft's capabilities, the autopilot will attain and hold the aircraft at the
vertical speed for which the VSI Bug is set. A typical view of the PFD with the
autopilot in this configuration is shown in Fig. 3-20.
As the aircraft approaches the target altitude, a scheduled reduction in the
vertical speed will automatically occur to ensure that there is no adverse
acceleration at the point of capture. Once the target altitude has been captured,
the VS annunciation will extinguish to indicate engagement of the ALT mode, as
shown in Fig. 3-21.
Note:
Prior to altitude capture, with the VS mode engaged and the ALT mode armed,
the PFD VSI Bug and/or PFD Alt Bug can be changed at any time, causing the
autopilot to respond accordingly.
Note:
During the pre-select sequence, with the VS mode engaged and the ALT
mode armed, the following are subject to occur:
1. Pressing the ALT mode selector switch once will disengage the VS mode,
and engage the ALT mode. Consequently, the VS annunciation will
extinguish, the PFD VSI Bug will reset to 0 FPM, and the Alt Bug will reset to
the captured altitude. Finally, this may cause some adverse acceleration, as
the autopilot works to hold the aircraft at the captured altitude.
2. Pressing the VS mode selector switch once will disarm the ALT mode,
but leave the VS mode engaged. Consequently, the ALT annunciation will
extinguish.