FLIGHT CONTROLS
AIRPLANE
OPERATIONS
MANUAL
2-13-35
Page
2
Code
01
REVISION 27
GROUND SPOILER
The Spoiler Control Unit (SCU) automatically performs ground spoiler
opening, without pilots' interference. The SCU enables the ground
spoilers to open whenever the following conditions are met:
− Airplane on the ground.
− Main landing gear wheels running above 25 kt.
− Both engines thrust lever angles set to below 30° or both engines N2
below 56%.
If any of those conditions is not met, the ground spoilers will not open.
A status indication is presented on the EICAS to indicate that the
spoilers are open or closed. If a failure is detected, a caution message
is presented on the EICAS.
SPEED BRAKE
When speed brake is commanded with autopilot engaged, the auto
pitch trim is provided through the autopilot; when the autopilot is not
engaged the Spoiler Control Unit provides the auto pitch trim
command.
The speed brakes will open when the speed brake lever is set to open
and the following conditions are met:
− Thrust lever angle of both engines set to below 50°.
− Flaps at 0° or 9°.
If the speed brake lever is commanded to the OPEN position and any
of the speed brake open condition is not met, the speed brake panels
are kept closed and a caution message is presented on the EICAS. If
the speed brake panels are open and any of the speed brake open
condition is not met, the speed brake panels automatically close and
an EICAS message is presented. In both cases, the speed brake lever
must be moved to the CLOSE position to remove the EICAS message.
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