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and stays there.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A318/A319/A320/A321 FLEET DSC-27-20-10-20 P 6/10
FCOM 19 AUG 10
This protection against stall and windshear has priority over all other protections. The autopilot
disconnects at α prot +1 °.
Vα prot, Vα floor, Vα max vary according to weight and configuration.
Angle-of-attack protection is deactivated, when the sidestick deflection is :
‐ Greater than 8 ° forward, or,
‐ Greater than 0.5 °for at least 0.5 s when α < α max.
In addition, below 200 ft, the angle of attack protection is also deactivated, when :
Sidestick ‐ deflection is less than half nose-up, and
‐ Actual α is less than α prot -2 °.
Note: 1. At takeoff αprot is equal to αmax for 5 s.
2. αfloor is activated through the A/THR system, when :
‐ α is greater than αfloor (9.5 ° in configuration 0; 15 ° in configuration 1, 2; 14 ° in
configuration 3 ; 13 ° in configuration FULL), or
‐ Sidestick deflection is greater than 14 ° nose up, with either the pitch attitude or the
angle-of-attack protection active.
The αfloor function is available from lift-off to 100 ft RA before landing.
Applicable to: ,
, MSN,,
HIGH ANGLE OF ATTACK PROTECTION
In normal law, when the angle-of-attack becomes greater than αprot, the system switches elevator
control from normal mode to a protection mode, in which the angle-of-attack is proportional to
sidestick deflection. That is, in the αprot range, from α prot to αmax, the sidestick commands
α directly. However, the angle-of-attack will not exceed αmax, even if the pilot gently pulls the
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A318/A319/A320/A321 FLEET DSC-27-20-10-20 P 7/10
FCOM 19 AUG 10
sidestick all the way back. If the pilot releases the sidestick, the angle-of-attack returns to αprot
and stays there.
This protection against stall and windshear has priority over all other protections. The autopilot
disconnects at α prot +1 °.
Vα prot, Vα floor, Vα max vary according to weight and configuration.
Angle-of-attack protection is deactivated, when the sidestick deflection is :
‐ Greater than 8 ° forward, or,
‐ Greater than 0.5 °for at least 0.5 s when α < α max.
In addition, below 200 ft, the angle of attack protection is also deactivated, when :
‐ Sidestick deflection is less than half nose-up, and
‐ Actual α is less than α prot -2 °.
Note: 1. At takeoff α prot is equal to α max for 5 s.
2. αfloor is activated through the A/THR system, when :
‐ α is greater than αfloor (9.5 ° in configuration 0; 14 ° in configuration 1 and
configuration 1 + F ; 13 ° in configuration 2 and 3 ; 12.5 ° in configuration FULL) or
‐ Sidestick deflection is greater than 14 ° nose up, with either the pitch attitude or the
angle-of-attack protection active.
The αfloor function is available from lift-off to 100 ft RA before landing.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A318/A319/A320/A321 FLEET DSC-27-20-10-20 P 8/10
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,
HIGH SPEED PROTECTION
The aircraft automatically recovers, following a high speed upset. Depending on the flight
conditions (high acceleration, low pitch attitude), High Speed Protection is activated at/or above
VMO/MMO.
When it is activated, the pitch trim is frozen. Positive spiral static stability is introduced to 0 ° bank
angle (instead of 33 ° in normal law), so that with the sidestick released, the aircraft always returns
to a bank angle of 0 °. The bank angle limit is reduced from 67 ° to 45 °.
As the speed increases above VMO/MMO, the sidestick nose-down authority is progressively
reduced, and a permanent nose-up order is applied to aid recovery to normal flight conditions.
High Speed Protection is deactivated, when the aircraft speed decreases below VMO/MMO,
where the usual normal control laws are recovered.
The autopilot disconnects, when High Speed Protection becomes active.
Note: The ECAM displays an “O/SPEED” warning at VMO +4 kt and MMO +0.006.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
　
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