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AILERON AND FLAPERON CONTROL -BANK ANGLE PROTECTION
Autopilot Operation
In autopilot operation, the BAP function becomes active when the bank angle is more than 35 degrees or the roll rate is more than 15 degrees per second. BAP stops the autopilot roll commands and takes over control of the roll.
The PFC BAP function sends a backdrive command through the AFDCs to one of the wheel backdrive actuators. The backdrive actuator moves the control wheels to decrease the airplane bank below 35 degrees. When the airplane bank is at 35 degrees and the autopilot requests to engage roll control, BAP becomes inactive and returns roll control to the autopilot.
Indications
Indications for BAP are shown on the:
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Multi-function display (MFD) status display
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Primary flight display (PFD)
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Flight control maintenance page.
On the MFD format, the status message BANK ANGLE PROTECT indicates one of these faults:
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Both wheel backdrive actuators are defective
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The wheel force transducer is defective
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The right and left AFDCs are inoperative.
On the PFD, the bank pointer changes to amber when the bank angle is 35 degrees or more.
Page 1 of the flight control maintenance pages has a protection mode activity which shows when BAP is active.
EFFECTIVITY BEJ ALL 27-11-00
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D633W101-BEJ Sep 05/2002
AILERON AND FLAPERON CONTROL -BANK ANGLE PROTECTION
EFFECTIVITY BEJ ALL 27-11-00
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D633W101-BEJ Jan 05/2002
RUDDER CONTROL -INTRODUCTION
General
The rudder controls the flight attitude of the airplane about the vertical axis.
The rudder hinges on the rear spar of the vertical stabilizer. A rudder tab increases the effect of the rudder. The rudder tab moves further in the same direction as the rudder.
Yaw Control
The pilots make a manual yaw correction with the rudder pedals. The autopilot does not control the rudder during most phases of flight. When the autopilot is engaged during the approach and landing phases of flight, the autoland function commands the rudder. The backdrive actuators then backdrive the rudder pedals.
Rudder Ratio
During flight, the rudder ratio function reduces the movement of the rudder as the airspeed increases. The primary flight computers (PFCs) command the rudder ratio function of the yaw control.
Yaw Damper
The PFCs control the conventional yaw damper and turn coordination functions of the rudder.
EFFECTIVITY
BEJ ALL
Wheel-Rudder Cross-Tie
The wheel-rudder cross-tie function moves the rudder in response to control wheel inputs when the airspeed is less than 210 knots. This makes roll and yaw control better during one-engine-out operation. It also lets the pilot control yaw caused by an engine failure with the control wheel.
Gust Suppression
A gust suppression function reduces the effects of air gusts on the vertical stabilizer.
Modal Suppression Function
A modal suppression function reduces the forward and aft body lateral movements.
Abbreviations and Acronyms
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ACE -actuator control electronics
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ACMS -airplane condition monitoring system
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ADIRS -air data inertial reference system
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ADIRU -air data inertial reference unit
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AFDC -autopilot flight director computer
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AFDS -autopilot flight director system
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AIMS -airplane information management system
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ARINC -Aeronautical Radio, Inc.
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CAS -computed airspeed
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CMCS -central maintenance computing system
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CPU -central processing unit
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EDIU -engine data interface unit
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EEC -electronic engine control
27-21-00
Page 1 D633W101-BEJ Sep 05/2002
RUDDER CONTROL -INTRODUCTION
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EHSV -electrohydraulic servo valve
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EICAS -engine indication and crew alerting system
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