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ELEVATOR CONTROL -FUNCTIONAL DESCRIPTION -ELEVATOR FEEL
Indications
The status message FLIGHT CONTROL SYS shows that there is a failure in one or more elevator feel actuators.
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ELEVATOR CONTROL -FUNCTIONAL DESCRIPTION -ELEVATOR FEEL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
Alternate Gear Down Dispatch Switch
Description
The alternate gear down dispatch switch has two positions.
Operation
When the alternate gear down dispatch switch is in the maximum operating speed (VMO) position, the WEU channels use the switch signals to lower the maximum speed limit to 270 knots and the maximum operating mach (MMO) to mach .73.
When the alternate gear down dispatch switch is in the normal position, the VMO is 330 knots. The MMO is .87.
Training Information Point
The memo message VMO GEAR DOWN shows on EICAS when you put the switch in the VMO position.
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777 AIRCRAFT MAINTENANCE MANUAL
WES -ALTERNATE GEAR DOWN DISPATCH SWITCH
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HORIZONTAL STABILIZER CONTROL -INTRODUCTION
General
The horizontal stabilizer supplies long-term correction of the pitch attitude of the airplane. This movement is around the lateral axis of the airplane.
Stabilizer Control
The elevator off-load function automatically sets the position of the stabilizer during manual flight or in autoflight. In this mode, the PFCs monitor elevator deflection and transfer pitch changes to the stabilizer. Once the stabilizer goes to its commanded position, the elevator moves to neutral.
The pilots command the stabilizer to move with either the pitch trim switches on the control wheels or the alternate pitch trim levers on the control stand.
The pilots stop unwanted stabilizer movement with the stabilizer cutout switches on the aisle stand.
Stabilizer Operation
Two hydraulic motors with two speeds move the horizontal stabilizer through a jackscrew mechanism. Four rates of horizontal stabilizer movement are available.
Abbreviations and Acronyms
*
ACE -actuator control electronics
*
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
*
AOA -angle of attack
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ARINC -Aeronautical Radio, Incorporated.
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CMCS -central maintenance computing system
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CPU -central processing unit
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EHSV -electrohydraulic servo valve
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EICAS -engine indication and crew alerting system
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FMCS -flight management computing system
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LIB -left inboard
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LOB -left outboard
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LTA -left trim arm
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LTC -left trim control
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LVDT -linear variable differential transformer
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MAT -maintenance access terminal
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MFD -multi-function display
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PCU -power control unit
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PFC -primary flight computer
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PFCS -primary flight control system
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PSA -power supply assembly
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RIB -right inboard
*
ROB -right outboard
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RTA -right trim arm
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RTC -right trim control
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RVDT -rotary variable differential transformer
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SAARU -secondary attitude air data reference unit
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SPM -stabilizer position module
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STCM -stabilizer trim control unit
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TED -trailing edge down
*
TEU -trailing edge up
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HORIZONTAL STABILIZER CONTROL -INTRODUCTION
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