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┃ Lii,~ A320 ┃ ┃SEQ 120 I ┃I REV 35 ┃
┃ A~7-~'M" A321 ┃FLIGHT AUGMENTATION ┃ ┃ ┃
┃ FLIGHT CREW OPERATING MANUAL ┃ ┃ ┃ ┃
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ALPHA-FLOOR PROTECTION
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 1.22.30 A/-rHR modes).
The FAC sends this signal when the angle of attack is above a predetermined threshold,
that 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 feet RA in approach.
Note
Alpha-floor is lost, when one of the following combinations of failures occurs
SFCCI and FAC2, or
SFCC2 and FAC I, or
Both FCU channels, or
I 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
LOW-ENERGY WARNING
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 will have
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
The warning is inhibited when :
- TOGA is selected, or
- Below 100 feet RA, or
- Above 2000 feet RA, 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.
CCM ALL
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┃ ┃ ┃1.22.40 P 6 ┃
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┃I -~ A318 ┃I FLIGHT AUGMENTATION ┃SEQ 100 1 ┃I REV 25 ┃
┃ .,,,.8, ,, ~L,~ A319 ┃ ┃ ┃ ┃
┃ Lii,~ A320 ┃ ┃ ┃ ┃
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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual2(96)
