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- master warning light
- overspeed red message on ECAM
- red and black strip along the PFD scale.
􀁺 Bank angle limitation to 45°
PFD
speed scale
Overspeed
protection
symbol
STL 945.7136/97
A319/A320/A321 EFCS flight envelope protection
5.26
􀁺 AOA protection – principle
- When α becomes greater than α prot, the flight
control normal law is replaced by an angle of
attack law (angle of attack corresponds to stick
displacement). Autotrim stops, resulting in a
nose-down tendency.
- If α reaches α floor the auto-thrust system will
apply go-around thrust.
- The α max cannot be exceeded even if the stick
is pulled fully back.
- At α max + 4° an audio stall warning (cricket +
synthetic voice) is provided.
􀁺 Consequences
- α prot is maintained if sidestick is left neutral
- α max is maintained if sidestick is deflected fully
aft
- Return to normal law is obtained when sidestick is
pushed forward.
􀁺 Amber strip on PFD indicates 1.13 Vs at take-off, or
1.23 Vs in other phases of flight.
VLS
Vα prot
Vα max
Amber
Black amber
Red
STL 945.7136/97
A319/A320/A321 EFCS flight envelope protection
5.27
􀁺 Manoeuvre protection
The objective is to limit the load factor so as to allow
the pilot to apply full sidestick deflection when high
manoeuvrability is required.
Load factor limits : + 2.5g to 1g in clean configuration
+ 2g to 0g flaps extended.
􀁺 Attitude protection
The objective is to complement AOA and high speed
protection in extreme conditions and in windshear.
Bank is limited to : 33° stick released
67° stick fully deflected.
Pitch is limited to : 30° nose up
15° nose down.
If these limits are approached, the aircraft pitch and
roll rate decrease and stop at the limit.
Bank
limitation (67°)
Pitch
limitation (15°)
Primary Flight Display

STL 945.7136/97
A319/A320/A321 EFCS flight envelope protection
5.29
􀁺 Windshear protection
Windshear protection is ensured by :
- SRS more
- speed trend indication
- wind (speed and direction indication)
- flight path vector
- high angle of attack protection
- windshear warning (optional).
􀁺 Low energy protection (basic on A321 and A319)
- An audio warning “SPEED, SPEED, SPEED” is
triggered to indicate to the crew that a thrust
increase is necessary to recover a positive flight
path angle through pitch control.
􀁺 Load Alleviation Function (LAF) (only for A320)
- The load alleviation function is used in conditions
of turbulence in order to relieve wing structure
loads
- The LAF becomes active at more than 0.3g in
which case the ailerons and the spoilers 4 and 5
are deflected symmetrically upwards
- The LAF is no longer necessary for A321 and
A319 which benefit from a reinforced structure.
STL 945.7136/97
A319/A320/A321 EFCS flight sidestick coupling/function
5.30
􀁺 Both sidesticks are coupled electronically to deal
with :
- simultaneous inputs
- conflicts.
􀁺 Full control is obtained by pressing and keeping
pressed the take-over button, thereby deactivating
the other pilot’s stick.
􀁺 After pressing the take-over button for more than 40
seconds, it can be released without loosing priority.
􀁺 When both pilots press their take-over buttons, the
last pilot to press will get the priority.
􀁺 onside priority can be maintained throughout by
keeping the button pressed continuously for 40s.
Priority lights in front of CAPT and F / O
Red
Green
Red
Green
STL 945.7136/97
A319/A320/A321 EFCS sidestick priority display logic
5.31
Captain’s side First Officer’s side
Sidestick Annunciation Annunciation Sidestick
Take-over button
depressed
Take-over button
depressed
Sidestick deflected
Sidestick in neutral
CAPT Green
Red
Red
Red
Red
Green F / O
Take-over button
depressed
Take-over button
depressed
Sidestick in neutral
Sidestick deflected
Red arrow in front of
the pilot = loss of authority
Green arrow in front of
the pilot = authority when
opposite sidestick deflected
“PRIORITY RIGHT/LEFT” audio voice message when priority is taken.
STL 945.7136/97
　
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