S-TEC ST 360 ALT, Pilot Operating Handbook

Page: 22 / 36

2nd Ed. Jan 15, 08 3-5
S–TEC
3.1.4 Vertical Speed (VS) Select
Press the VS switch. The VS annunciation will appear, along with the selected
vertical speed. The latter appears as a number in units of FPM x 100, prefixed by
either a "+" to indicate a climb, or a "-" to indicate a descent (i.e., for example,
+5 indicates 500 FPM climbing). For a climb, rotate the Modifier Knob clockwise
(CW) to increase the vertical speed selection, or counter-clockwise (CCW) to
decrease the selection. For a descent, rotate the Modifier Knob CCW to
increase the vertical speed selection, or CW to decrease the selection.
It is not necessary for ENT to be annunciated, in order to enter the selected
vertical speed and for it to be operational. If ENT does happen to be annunciated,
then the VS annunciation will flash when the VS switch is pressed. In that case,
pressing the DTA switch will cause the ENT annunciation to extinguish, the VS
annunciation to stop flashing, and the selected vertical speed to become
operational.
The Selector / Alerter now has vertical speed command authority. The ability to
command vertical speed from the autopilot controls is disabled. These controls
for each respective autopilot are as follows:
System Fifty Five X - Modifier Knob
System Sixty Two - UP Switch and DN Switch
System Sixty Five - UP Switch and DN Switch
Pitch Stabilization System (PSS) - UP Switch and DN Switch
The acknowledgment that its commanded vertical speed is coming from the
Selector / Alerter is as follows, for each respective autopilot:
System Fifty Five X - SEL annunciation appears on optional Remote Annunciator
- Current Vertical Speed extinguished (polarity and number)
System Sixty Two - SEL annunciation appears on Programmer/Annunciator
System Sixty Five - SEL annunciation appears on Annunciator
Pitch Stabilization System (PSS) - No Acknowledgment
To revert vertical speed command authority back to the autopilot controls, press
the MAN switch. This will be acknowledged by the Selector / Alerter, through the
extinguishment of its VS annunciation and selected vertical speed.
During a climb or descent, a scheduled reduction in the selected vertical speed
will automatically occur as the aircraft approaches the selected altitude. This
enables the aircraft to transition from vertical flight to altitude capture, without
adverse acceleration.
The selected vertical speed will decrease in increments, as the aircraft arrives
at fixed displacement points from the selected altitude. The result is that the
vertical speed will be 300 FPM at altitude capture, which occurs 100 FT from the
selected altitude.