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instrument panel (See Airplane Flight Manual for current airspeeds).
Flap Control Unit
When the FCU commands a change in flap position, the flap brakes are released, and two
AC-powered motors, mounted on a flap gearbox, are energized. The gearbox rotates flex shafts,
which move the flap ballscrew actuators, extending or retracting the flaps. When the desired
setting is reached, the motors are deenergized and the flap brakes are applied. The flaps are
mechanically interconnected for simultaneous movement of the inboard and outboard flap
sections.
Flap position and condition are continuously monitored by the flap control unit. In the event of
failure or overheat of a single flap motor (indicated by a FLAPS MOTOR OVHT status EICAS
message), the remaining motor can operate the flaps at half speed. Complete failure of the flap
system, including an asymmetry of >2.75°, will generate a FLAPS FAIL caution EICAS message,
as well as an amber symbol on the FLIGHT CONTROLS synoptic page.
If the flaps are not set at 20° with the aircraft in takeoff mode, a CONFIG FLAPS warning EICAS
message and aural warning will be displayed/sounded.
FLIGHT CONTROLS
Description
Vol. 2 10−10−11
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
SECONDARY FLIGHT CONTROLS (CONT'D)
Flap Schematic
Figure 10−10−9
Flight Spoilers
These provide lift dumping and speed control when airborne, and reduce ground roll during
landing and rejected takeoffs.
FLIGHT CONTROLS
Description
Vol. 2 10−10−12
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
SECONDARY FLIGHT CONTROLS (CONT'D)
Each flight spoiler panel is hydraulically operated by two identical PCUs, powered by hydraulic
systems 1 and 2. The flight spoilers are mechanical controlled by the flight spoiler control lever
on the center pedestal, and can be deployed up to a maximum of 40° in flight or on the ground.
The flight spoiler control lever travels through nine detents, allowing the pilot to select variable
amounts of flight spoiler deployment.
Spoiler position is indicated on both the EICAS page and FLIGHT CONTROLS synoptic page,
using white arrows which move upward towards lines indicating relative extension (for flight
spoilers only), and full extension (for both flight and ground spoilers). When the flight and ground
spoilers are fully retracted, all EICAS spoiler icons and position arrows disappear.
An amber FLT SPLRS DEPLOY caution EICAS message appears if the flight spoilers are
deployed in flight, and:
• The aircraft radio altitude is between 10 and 300 feet AGL, or
• The left or right engine N1 is greater than 79%, or
• If radio altitude is not available, at any time the landing gear is extended.
If the flight spoilers are not stowed with the aircraft in takeoff mode, a CONFIG SPOILERS
warning EICAS message and aural warning will be displayed/sounded.
20° Detent Mechanism
A 20° detent mechanism prevents asymmetrical deployment of the flight spoilers in the event
of a disconnected input linkage. The PCU control valves are spring-loaded retracted, but the
detent mechanism will apply force to hold a mid-position if the spoiler has been deployed to
greater than 20°. When on the ground with hydraulic pressure available, a sensor on each
detent mechanism will generate a FLT SPLRS caution EICAS message, and cause the
appropriate flight spoiler outline to turn amber on the FLIGHT CONTROLS synoptic page, if the
spoiler position does not correspond to the detent position.
FLIGHT CONTROLS
Description
Vol. 2 10−10−13
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
SECONDARY FLIGHT CONTROLS (CONT'D)
Flight and Ground Spoilers − Schematic
Figure 10−10−10
Ground Spoilers
The inboard spoiler panels on each wing are the ground spoilers. The ground spoilers have only
two positions: retracted or fully deployed to 45°. A single actuator, powered by hydraulic
system 1, operates each ground spoiler.
FLIGHT CONTROLS
Description
Vol. 2 10−10−14
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
SECONDARY FLIGHT CONTROLS (CONT'D)
After touchdown or during a rejected takeoff, the ground spoilers extend to dump lift and
increase drag, to assist in aircraft braking. Ground spoiler deployment is normally automatic, but
can be activated manually by the pilot.
In the automatic or manual modes, arming, deployment and retraction is controlled by the
proximity sensor electronic unit (PSEU). The PSEU monitors inputs from the following:
　
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