Actuators of the fly-by-wire system and trim mechanisms are used as actuators of the automatic
control system (there are no separate ACS actuators).
Before turning on the ACS, the aircraft should trim (except for the "Level up to the Horizon" -
"Приведение к горизонту" mode). Deflection of the controls of more than 20% during the ACS
operation (or excess of pitch/bank angles of 80 degrees) disables ACS and places it in Manual Control
mode (except for the Level up to the Horizon) as the annunciator on the left part of the main cockpit
panel indicates. In this case, one should reset ACS by the "СБРОС" (RESET) pushbutton [Alt -9].
Figure 42: Manual Control annunciator
The ACS modes are controlled by push-light switches on the left console.
Figure 43: ACS push-light switches
The push-light switch “АВТОМ” (AUTO) will activate when any of the ACS modes (combined with
other push-light switches) is enabled. If this push-light switch is off, it means that the ACS is inactive.
If this push-light switch is the only one on, it means the attitude hold mode of the aircraft is active.
To control the ACS, the following commands are used:
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