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pulls the sidestick all the way back. If the pilot releases the sidestick, the angle-of-attack returns to
α􀀃prot􀀃and􀀃stays􀀃there.􀀃
This protection against stall and windshear has priority over all other protections.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-20 P 5/8
FCOM 19 AUG 10
The autopilot will disconnect, if the protection is active.
􀀃Vα􀀃prot,􀀃Vα􀀃max,􀀃and􀀃α􀀃floor􀀃condition􀀃vary􀀃according􀀃to􀀃weight‐ 􀀃and􀀃configuration
‐􀀃Vα􀀃prot􀀃and􀀃Vα􀀃max,􀀃displayed􀀃on􀀃the􀀃PFD,􀀃are􀀃computed􀀃by􀀃the􀀃PRIM.
‐􀀃α􀀃floor􀀃activation􀀃logic􀀃is􀀃provided􀀃by􀀃the􀀃PRIM.
Note: 1. At takeoff, α prot is equal to α max for 5 s.
2. α FLOOR is activated through the autothrust system, when :
• α is greater than a threshold depending on the aircraft configuration, the ground
speed variation, and the difference between ground speed and air speed, or the
• Sidestick deflection above 14 ° and the :
‐ Pitch attitude is greater than 25 °, or
‐ AOA protection active
3. α FLOOR inhibition (Refer to STLO-22_30_R-90 A/THR MODE REVERSION).
The aircraft leaves angle-of-attack protection when the :
‐ Sidestick is pushed more than 8 ° forward, or
‐􀀃Sidestick􀀃is􀀃pushed􀀃more􀀃than􀀃0􀀃°􀀃forward􀀃for􀀃at􀀃least􀀃1􀀃s,􀀃when􀀃α􀀃<􀀃α􀀃max,􀀃or
‐􀀃The􀀃sidestick􀀃is􀀃at􀀃neutral􀀃or􀀃pushed􀀃forward,􀀃for􀀃at􀀃least􀀃0.5􀀃s,􀀃when􀀃α􀀃<􀀃α􀀃prot.
Applicable to: ALL
HIGH SPEED PROTECTION
The aircraft automatically recovers following a high speed upset. Depending on the flight
conditions (high acceleration, low pitch attitude), the High Speed Protection is activated at/or
above VMO/MMO.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-20 P 6/8
FCOM 19 AUG 10
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.
The 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 goes active.
Note: OVERSPEED ECAM warning is provided at :
• VMO +4 kt
• MMO +0.006
Applicable to: ALL
LOW ENERGY WARNING
A low energy aural warning “SPEED SPEED SPEED” repeated every 5 s indicates to the pilot that
the aircraft energy becomes lower than a threshold under which to recover a positive flight path
angle through pitch control, the thrust must be increased.
It is available in configuration 2, 3 and full between 100 and 2 000 ft.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
A330/A340 FLEET DSC-27-20-10-20 P 7/8
FCOM 19 AUG 10
The low energy warning is computed by the PRIM's from the following inputs:
‐ Aircraft configuration
‐ Air speed deceleration rate
‐ Flight path angle
It is inhibited when:
‐ TOGA is selected
‐ Below 100 ft RA
‐ Above 2 000 ft RA
‐ Alpha floor or GPWS alert is triggered
‐ In alternate or direct law
‐ If both RA are failed
The low energy warning is triggered during deceleration before alpha floor (unless alpha floor is
triggered by stick deflection), the delay between the two warnings depends on deceleration rate.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
FLIGHT CONTROL SYSTEM - NORMAL LAW
　
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