Section 3 In-Flight Procedures
2nd Ed Aug 2019
S-TEC 3100 Digital and Analog
3-2
NOTE:
The 3100 also disconnects under the following circumstances:
1) Push the manual electric trim switch;
2) When the 3100 detects a fault in the system or an attitude
miscompare.
3.3.
AUTOPILOT (AP) OPERATION
The 3100 interprets the steering commands calculated by the flight director
and sends drive signals to the pitch and roll servos. The servos control the
connected aircraft flight surfaces to fly the flight profile. The flight director
display provides a visual indication of how accurately the 3100 is tracking
the roll and pitch commands.
Active envelope protection is operating when the 3100 is in AP mode.
3.4.
FLIGHT DIRECTOR (FD) OPERATION
The flight director (FD) calculates the vertical and lateral movement required
for the aircraft to follow the flight profile. The flight profile is determined by
the 3100 lateral and vertical mode selected and data from the interfaced
avionics.
In FD mode, the 3100 outputs pitch and roll steering commands for display
on a connected flight director display. The steering commands are present
whether a flight director display is connected or not. The FD provides a visual
indication of how accurately the pilot is tracking roll and pitch command.
Passive envelope protection is operating when the 3100 is in FD mode.
NOTE:
If the pilot does not track the steering cues when the 3100 is operating
in FD only mode, the flight director steering bars continue to increase
the pitch and roll to intercept the calculated flight profile at the time of
mode engagement.
It is recommended to sync up the aircraft attitude with the flight director
steering bars or select a new mode before engaging the 3100 to avoid
aggressive banks or climbs.
