FLIGHT CONTROLS
Volume 2
Flight Crew Operating Manual
Sep 13/2004
10-02-12
CSP 100-6
REV 1
SECONDARY FLIGHT CONTROLS (Cont)
GROUND SPOILERS
DESCRIPTION
After touchdown or during a rejected takeoff, the inboard and outboard ground spoilers in conjunction with the multifunc-
tion spoilers are extended to spoil lift and increase drag to assist in aircraft braking. The ground spoilers function is nor-
mally automatic but can be activated manually by the pilot. The ground spoilers have no in-flight function.
COMPONENTS AND OPERATION
The ground spoiler function is selected by the three position GND SPOILERS switch as follows:
- OFF — Disables the ground spoilers by disarming the function
- AUTO — Automatically arms the ground spoilers for landing and rejected takeoff in conjunction with throttle
lever angle, wheel speed, weight on wheels and radio altitude
- MANUAL ARM — Arms the ground spoilers regardless of the inputs required to arm in the AUTO position
When deployed, the ground spoiler panels extend to 60
°
and the multifunctional panels extend to 45
°
, however, only the
multifunction panels respond to control wheel roll assist inputs. Ground spoilers deploy when the inputs for ground spoiler
deploy logic are throttles at IDLE, and 2 of the 3 following criteria are met: radio altitude less than 7 ft, weight on wheels,
and wheelspeed greater than 16 kt.
The position of all panels are shown on the EICAS FLIGHT CONTROLS synoptic page. Green arrows and position scales
indicate relative deflection of the surfaces.
Inboard and outboard ground spoilers are limited to two positions, either up or down. The spoilers are
continuously monitored and any fault detected is displayed on the appropriate EICAS screen.
CF
O
1005002
_006
MANUAL
ARM
GND SPOILERS
OFF
ROLL SPOILERS
OFF
AUTO
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