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has memorized and updated with a fuel consumption model set in the FAC.
ALPHA-FLOOR PROTECTION
Applicable to:
, ,
MSN
Alpha-floor protection automatically sets the thrust at TOGA thrust, when the aircraft reaches a very
high angle of attack.
The Flight Augmentation Computer (FAC) generates the signal that triggers the alpha-floor mode.
This, in turn, sets TOGA thrust on the engines, regardless of the thrust lever positions (Refer to
STLO-22_30_R-90-C A/THR MODES - GENERAL).
The FAC sends this signal when the angle of attack is above a predetermined threshold, which is a
function of the configuration.
In CONF3 and CONF FULL, this threshold decreases as a function of the aircraft deceleration rate
(down to – 3 °).
Alpha-floor is available from lift-off until the aircraft reaches 100 ftRA in approach.
Note: ‐ Alpha-floor is lost, when one of the following combinations of failures occurs :
SFCC1 and FAC2, or
SFCC2 and FAC1, or
Both FCU channels, or
1 EIU, or
Both FMGCs.
‐ Alpha-floor is lost under alternate or direct flight control law.
‐ Alpha-floor is lost in engine-out, when slats/flaps are extended.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
FLIGHT ENVELOPE FUNCTION
A318/A319/A320/A321 FLEET DSC-22_40-30 P 4/6
FCOM 19 AUG 10
ALPHA-FLOOR PROTECTION
Applicable to: MSN
4566,,,
Alpha-floor protection automatically sets the thrust at TOGA thrust, when the aircraft reaches a very
high angle of attack.
The Flight Augmentation Computer (FAC) generates the signal that triggers the alpha-floor mode.
This, in turn, sets TOGA thrust on the engines, regardless of the thrust lever positions (Refer to
STLO-22_30_R-90-C A/THR MODES - GENERAL).
The FAC sends this signal when the angle of attack is above a predetermined threshold, which is a
function of the configuration.
In CONF3 and CONF FULL, this threshold decreases as a function of the aircraft deceleration rate
(down to – 3 °).
Alpha-floor is available from lift-off until the aircraft reaches 100 ftRA in approach.
Note: ‐ Alpha-floor is lost, when one of the following combinations of failures occurs :
SFCC1 and FAC2, or
SFCC2 and FAC1, or
Both FCU channels, or
1 EIU, or
Both FMGCs.
‐ Alpha-floor is lost under alternate or direct flight control law.
‐ Alpha-floor is lost when the FADECs are in N1 degraded mode.
‐ Alpha-floor is lost in engine-out, when slats/flaps are extended.
LOW- ENERGY WARNING
Applicable to:
,
,
MSN,,,
An aural low-energy “SPEED SPEED SPEED” warning, repeated every five seconds, warns the pilot
that the aircraft’s energy level is going below a threshold under which he has to increase thrust, in
order to regain a positive flight path angle through pitch control.
It is available in Configuration 2, 3, and FULL. The FAC computes the energy level with the following
inputs :
‐ Aircraft configuration
‐ Horizontal deceleration rate
‐ Flight path angle
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
FLIGHT ENVELOPE FUNCTION
A318/A319/A320/A321 FLEET DSC-22_40-30 P 5/6
FCOM 19 AUG 10
The warning is inhibited when :
‐ TOGA is selected, or
‐ Below 100 ft RA, or
‐ Above 2 000 ftRA, or
‐ Alpha-floor, or the ground proximity warning system alert is triggered, or
‐ In alternate or direct law, or
‐ If both radio altimeters fail.
During deceleration, the low-energy warning is triggered before alpha floor (unless alpha floor
is triggered by stick deflection). The amount of time between the two warnings depends on the
deceleration rate.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
FLIGHT ENVELOPE FUNCTION
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_40-30 P 6/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT AUGMENTATION
WINDSHEAR DETECTION FUNCTION
A318/A319/A320/A321 FLEET DSC-22_40-40 P 1/2
FCOM 19 AUG 10
WINDSHEAR DETECTION FUNCTION
Applicable to: ALL
Whenever a flight augmentation computer (FAC) detects windshear conditions, it triggers a warning
‐ “WINDSHEAR” in red on both PFDs (for at least 15 s)
‐ an aural warning, “windshear”, repeated three times
The windshear detection function is operative during takeoff and during approach, as follows:
‐ at takeoff, from lift-off up to 1 300 ft
　
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