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and 3. Control wheel movement also signals the spoiler electronic control unit (SECU) to
input the spoileron actuators (on the down--going wing) for roll assist.
Control wheel centering and artificial feel is provided by mechanical feel units. A flutter
damper is attached to each aileron to prevent surface flutter in the event of hydraulic fluid
loss at the PCUs during flight. On the ground, the flutter dampers provide gust lock function.
In the event of an aileron control jam, the left and right systems can be mechanically
separated by pulling a roll disconnect handle. The roll disconnect allows limited lateral
control using the unaffected aileron control system and the opposite side spoileron. Twenty
seconds after pulling the roll disconnect handle, the ROLL SEL (amber) switchlights on the
left and right glareshield illuminate and a SPOILERON ROLL caution message is displayed
on the EICAS primary page. The flight crew then selects the roll priority by pressing the
ROLL SEL switchlight on the operable side which allows use of both spoilerons. The ROLL
SEL light and PLT/CPLT ROLL light will then turn green and the caution message will be
replaced by a PLT/CPLT ROLL CMD advisory message on the EICAS status page.
NOTE
It is not recommended to operate the automatic flight
control system (AFCS) autopilot, if a jammed aileron
control circuit condition exists.
If uncommanded movement of a PCU occurs, the SECU’s command both spoilerons to
respond to control wheel inputs. The green ROLL SEL light illuminates and the PLT or
CPLT ROLL CMD advisory message is displayed on the EICAS status page. The roll
disconnect handle should then be pulled.
REV 56, Jan 31/03
Vol. 1 11--20--2
FLIGHT CONTROLS
Ailerons
Flight Crew Operating Manual MASTER
CSP A--013
Ailerons --- Emergency Control
Figure 11---20---1
ROLL DISC
PULL &
TURN
Roll Disconnect Handle
Center Pedestal
Ailerons --- Glareshield Emergency Control
Figure 11---20---2
ROLL SEL
ROLL SEL (amber) light
comes on to indicate that roll
priority selection is required.
PLT ROLL or CPLT ROLL
Used to select roll priority.
PLT ROLL or CPLT ROLL (green) light
indicates which side has been selected
manually or automatically, for spoileron
control.
Left Glareshield Right Glareshield
A. Aileron Trim
Aileron trim is electrically operated and manually controlled using the trim selector on
the center pedestal. Operation of the aileron trim will input the aileron trim actuator to
reposition the aileron control cables which will cause deflection (rotation) of the control
wheels. Aileron trim is displayed on the EICAS Status page and FLT CONTROL
synoptic page.
Vol. 1 11--20--3
REV 56, Jan 31/03
FLIGHT CONTROLS
Ailerons
Flight Crew Operating Manual
CSP A--013
MASTER
Ailerons -- Trim Control
Figure 11--20--3
AIL TRIM
Used to control aileron trim.
Spring loaded to center position.
LWD -- Trims left wing down.
RWD -- Trims right wing down.
Aileron / Rudder Trim Panel
Center Pedestal
Aileron Mistrim Flag <MST>
Figure 11---20---4
Aileron Mistrim Indicator (yellow)
Indicates that the ailerons are in a
mistrim condition, when the autopilot
is engaged.
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
A
REV 56, Jan 31/03
Vol. 1 11--20--4
FLIGHT CONTROLS
Ailerons
Flight Crew Operating Manual MASTER
CSP A--013
Aileron System --- EICAS Messages <MST>
Figure 11---20---5
PLT ROLL CMD advisory (green)
Comes on to indicate that spoileron control has
been selected to the pilot’s aileron circuit.
CPLT ROLL CMD advisory (green)
Comes on to indicate that spoileron control has
been selected to the copilot’s aileron circuit.
SPOILERONS FAULT status (white)
Comes on to indicate loss of redundancy in
the spoileron control.
Status Page
<0039>
<0039>
Primary Page
<0039> <0006>
CONFIG
TRIM
L, R SPOILERON caution (amber)
Comes on when the respective spoileron is
inoperative.
SPOILERONS caution (amber)
Comes on to indicate that the spoilerons are
inoperative.
Vol. 1 11--20--5
REV 56, Jan 31/03
FLIGHT CONTROLS
Ailerons
Flight Crew Operating Manual
CSP A--013
MASTER
Flight Control Synoptic Page <MST>
Figure 11---20---6
Aileron Position Scale (white)
Top tick mark represents 24 degrees
up, center tick mark represents 0
degrees and bottom tick mark
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