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(except for spoilers 4 and 6).
SPEEDBRAKE AND GROUND SPOILER CONTROL
Applicable to: ALL
SPEEDBRAKE CONTROL
The pilot controls the speedbrakes with the speedbrake control lever. The speedbrakes involve
spoilers 1 to 6. Speedbrake extension is inhibited, if :
Maneuver ‐ Load Alleviation (MLA) is activated.
‐ Angle-of-attack protection is active.
‐ Low speed stability is active.
‐ At least one thrust lever above MCT.
‐ Alpha floor is activated.
If an inhibition occurs when the speedbrakes are extended, they automatically retract and stay
retracted until the inhibition condition disappears, and the pilot resets the lever. (The speedbrakes
can be extended again, 5 s after the lever is reset). When a speedbrake surface on one wing fails,
the symmetric speedbrake surface on the other wing is inhibited.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 9/22
FCOM 19 AUG 10
L3Maximum
deflection
: 25 ° for spoiler 1
30 ° for spoilers 2 to 6
Reduced in Conf 2, 3 and FULL
For surfaces 2 to 6 (that perform roll and speedbrake functions), the roll function has priority :
When the sum of a roll order and a simultaneous speedbrake order on one surface is greater than
the maximum deflection achievable in flight, the symmetrical one is retracted until the difference
between the two surfaces is equal to the roll order.
Applicable to:
GROUND SPOILER CONTROL
Spoilers 1 to 6 act as ground spoilers.
When a ground spoiler surface on one wing fails, the symmetric one on the other wing is inhibited.
ARMING
The pilot arms the ground spoiler function by pulling the speedbrake control lever up into the
armed position.
FULL EXTENSION - REJECTED TAKEOFF PHASE
�� If the ground spoilers are armed and the speed exceeds 72 kt the ground spoilers will
automatically extend as soon as all thrust levers are set to idle.
�� If the ground spoilers are not armed and the speed exceeds 72 kt the ground spoilers
will automatically extend as soon as reverse is selected on at least two symmetric
engines (remaining engines at idle).
FULL EXTENSION - LANDING PHASE
�� If the ground spoilers are armed and all thrust levers are at idle the ground spoilers
will automatically extend as soon as both main landing gears have touched down.
�� If the ground spoilers are not armed and both main landing gears have touched down
the ground spoilers will automatically extend as soon as reverse is selected on at least two
symmetric engines (remaining engines at idle).
�� If the speedbrakes are not retracted and all thrust levers are at idle the ground
spoilers will automatically extend as soon as both main landing gears have touched
down.
Note: The spoiler roll function is inhibited when spoilers are used for the ground spoiler
function.
PARTIAL EXTENSION
The ground spoilers partially extend when reverse is selected on at least two symmetric engines
(remaining engines at idle) and one main landing gear is compressed.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 10/22
FCOM 19 AUG 10
This partial extension, by decreasing the lift, will ease the compression of the second main
landing gear, and consequently will lead to the normal ground spoiler extension.
RETRACTION
The ground spoilers retract when :
‐ One thrust lever is above idle, or
‐ All thrust levers are at forward idle, and the speedbrake control lever is pushed down.
L3 (*) Condition on wheel speed is inhibited after GND/FLT transition.
This condition is rearmed if wheel rotation stops.
As a result, after an aircraft bounce (aircraft airborne), if the ground spoilers are extended:
‐ The ground spoilers remain extended, with the thrust levers at idle
‐ The ground spoilers retract, if thrust is increased above idle (go-around), and extend
again after the next touchdown.
The thrust levers are considered to be at idle when they are :
• Below 4.7 °, when the RA is above 6 ft,
• Below 32 °, when the RA is below 6 ft.
L1 Surfaces partially/fully extend to :
• 14 °/35 ° for spoiler 1,
• 28 °/50 ° for spoilers 2 to 6.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 11/22
FCOM 19 AUG 10
Applicable to: ,
GROUND SPOILER CONTROL
Spoilers 1 to 6 act as ground spoilers.
When a ground spoiler surface on one wing fails, the symmetric one on the other wing is inhibited.
　
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