PFCS -ACTUATOR CONFIDENCE TEST AND ACE MONITOR TEST INDICATIONS
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HIGH LIFT CONTROL -INTRODUCTION
General
The high lift control system (HLCS) improves the takeoff and landing performance of the airplane. The HLCS includes the trailing edge flaps and the leading edge slats.
Trailing Edge Flaps
During takeoff, the trailing edge flaps increase the lift of the wing. During landing, the flaps increase the lift and drag. The flaps are not used during cruise. There is one double-slotted inboard flap and one single-slotted outboard flap on each wing.
Leading Edge Slats and Krueger Flaps
During takeoff and landing, the leading edge slats and Krueger flaps increase the lift of the wing. These surfaces are not used during cruise. There are seven slats and one Krueger flap on each wing.
Abbreviations and Acronyms
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ACE -actuator control electronics
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ACMS -airplane condition monitoring system
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ADIRU -air data inertial reference unit
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AIMS -airplane information management system
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altn -alternate
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ARINC -Aeronautical Radio, Inc.
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CMCS -central maintenance computing system
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EICAS -engine indication and crew alerting system
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FMCS -flight management computing system
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FSEU -flap/slat electronics unit
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HLCS -high lift control system
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HYDIM -hydraulic interface module
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LVDT -linear variable differential transformer
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MAT -maintenance access terminal
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PDU -power drive unit
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PFCS -primary flight control system
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PSEU -proximity switch electronic unit
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RVDT -rotary variable differential transformer
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SAARU -secondary attitude air data reference unit
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sec -secondary
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WEU -warning electronic unit
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WOW -weight-on-wheels
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HIGH LIFT CONTROL -INTRODUCTION
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HIGH LIFT CONTROL -GENERAL DESCRIPTION
General
The HLCS controls the operation of the:
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Trailing edge flaps
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Leading edge slats
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Krueger flaps.
The HLCS has these three modes of operation:
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Primary
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Secondary
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Alternate.
In the primary mode, hydraulic power moves the flaps and slats. In the secondary and alternate modes, electrical power moves the flaps and slats.
In the primary and secondary modes, the control is closed-loop. Closed-loop control stops the command when a feedback signal equals the command. In the alternate mode, the control is open-loop. Open-loop control stops the commands only when you stop the input or when the surfaces are at a limit.
Primary Mode
The flap lever position sensors send input signals to the flap/ slat electronic units (FSEUs). The FSEUs use the flap lever position to calculate the flap and slat commands. The FSEUs also receive data from the systems ARINC 629 buses.
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The FSEUs send the flap and slat commands to the flap and slat primary control valves. These valves supply hydraulic pressure to the flap and slat power drive units (PDUs). Hydraulic motors in the PDUs then move the flap and slat mechanisms.
The flap/slat priority valve controls the amount of hydraulic flow to the flap and slat primary control valves. The flap/slat priority valve gives priority of hydraulic power to the primary flight control system (PFCS) over the HLCS.
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