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Airbus A320 simulator flight Basic idea of Airbus fly by wire
Jacklyn WuIVAO HKStanding Committee on Aviation Resource and Education Development
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Objective
• Basic understanding of flight controls• Flight control laws/modes of Airbus family• Handling characteristics of Airbus family
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Four Forces
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Primary Flight Controls
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Mechanical Flight Control Systems
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Fly by wire Flight Control Systems
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Fly by wire Flight Control Systems
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Fly by wire Airbus Flight Control Laws
Normal Law Alternative Law Direct Law
Ground Mode
Flight Mode
Flare Mode
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Ground Mode
Surface deflection is proportional to stick deflection
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Flight mode - Protections
Load Factor Protection• 2.5 g in clean
configuration,• 2.0 g with the flaps
extended.
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Flight mode - Protections
Pitch Protection
•30 degree up / 15 degree down
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Flight mode - Protections
High Speed Protection
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Flight mode - Protections
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Flight mode - Protections
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Flight mode – Pitch Control
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Flight mode – Pitch Control
if there is no input on the stick:• The aircraft maintains the flight path, even in
case of speed changes• In case of configuration changes or thrust
variations, the aircraft compensates for the pitching moment effects
• In turbulence, small deviations occur on the flight path. However, the aircraft tends to regain asteady condition.
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Flight mode – Pitch Control
• Flare requires the pilot to apply permanent aft pressure on the sidestick, in order to achieve a progressive flare.
• Whereas, derotation consists of smoothly flying the nosegear down, by applying slight aft pressure on the sidestick.
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Flight mode – Roll Control
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Flight mode – Roll Control
During a normal turn (bank angle less than 33 °), in level flight:• The more the sidestick is moved laterally, the greater
the resulting roll rate - e.g. 15 °/s at max deflection• Not necessary to make a pitch correction• Not necessary to use the rudder.In the case of steep turns (bank angle greater than 33 °)• Lateral pressure on the sidestick to maintain bank• Aft pressure on the sidestick to maintain level flight.
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