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Flight Control Computers
Also from: PRIM; SEC
Receive inputs from the side sticks and the autopilot, and then manage the control surfaces. Control response is fed back to the flight control computers. Each control actuator on a control surface is controlled by a different computer, with one in active mode and the other in damping mode.
Preset limitations and instructions called laws are used.
Primary computers
There are 3 PRIM computers. Used for:
- normal, alternate, direct control laws
- speed brake and ground spoiler control
- protection speed computation
- rudder travel limit
Secondary computers
There are 2 SEC computers. Used for:
- direct control laws
- rudder trim, rudder travel limit
Failures
If a computer fails, the next computer of the same type takes over.
| F/CTL SEC 1(2) FAULT | - the other SEC automatically takes over - the SEC can be recycled manually - the actuator display on the F/CTL page becomes boxed in amber and switches to damping mode if it was in active mode |