AN INTRODUCTION TO FLY BY WIRE(FBW):

Traditionally pilots use an inceptor (a wheel, control column, or sidestick) to manipulate cables that control pumps and hydraulic actuators. The actuators in turn operate surfaces such as flaps, ailerons and rudders to provide the necessary effect (e.g. roll left, yaw right etc).

The FBW inceptor is usually a sidestick (so called because it is mounted on the pilot's side). Moving the stick generates electrical signals that are processed by the onboard Flight Control Computer (henceforth called FCC) and relayed as control signals to energise pumps, move actuators and position control surfaces. The set-up, inceptor to Relayer to Actuators constitutes a Flight Control System (henceforth called FCS).

The fundamental difference between conventional- mechanical FCS and FBW FCS is the relayers. Whereas conventional FCS connect inceptor to actuators mechanically via cables and mechanical linkages etc, FBW FCS use electrical signals sent down wires (hence FBW) from inceptor to actuators to achieve the desired effect. The FCC therefore is central to a FBW FCS and acts as a nerve centre where mechanical inputs from the inceptor are interpr

The A320 also has stall protection through the incorporation of AOA limits beyond which the FCC will not permit the aircraft to go no matter what control inputs are made by the pilot. An angle of 15 degrees has been designated as the AOA "floor" at which the throttles /engines advance automatically to full power in order to avoid stall. 17 degrees is AOA limit and the point which the FCC will stabilise the aircraft for a maximum power/maximum climb situation.

WHY A FLY BY WIRE FLIGHT CONTROL SYSTEM?

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Approximate Word count = 1729
Approximate Pages = 7 (250 words per page double spaced)