777 AMM 飞机维护手册 飞行操纵 Flight Controls 2(30)

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The PFCs calculate the stabilizer position from the ACE signals and send the data to AIMS. AIMS changes the data and sends them through ARINC 429 buses to the stabilizer position indicators. The indicators show the stabilizer position with a pointer that moves adjacent to the indicator scale.
The WEUs calculate the green band position based on FMCF data in AIMS. The pilot manually enters the airplane weight, the position of the center of gravity, and the engine thrust rating into the FMCF. The WEUs use these data to calculate the length of the greenband. The WEUs also use the nose gear pressure switch signal to verify the green band calculation. The WEUs then send the green band data to the AIMS. The AIMS uses this data to show the green band on the stabilizer position indicators.
Indications
If there is a disagreement between the green band calculation and the weight on the nose gear, the STAB GREENBAND advisory message shows.

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HORIZONTAL STABILIZER POSITION INDICATION -FUNCTIONAL DESCRIPTION

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TRAILING EDGE FLAPS -INTRODUCTION

General

The trailing edge (TE) flaps improve the takeoff and landing performance of the airplane. When the flaps extend, they increase the lift of the wing. They also help to decrease the airspeed during landings and approaches.
The flaps are part of the high lift control system (HLCS). The HLCS electrically controls the flaps with a fly-by-wire system.
During takeoff and landing, the pilots use the flap lever to command the flaps to move to an extended position. During cruise, the pilots command the flaps to retract to the up position.
Each wing has an inboard flap and an outboard flap. The inboard flap is double-slotted and has a main flap and an aft flap. The outboard flap is single-slotted and is one piece.
Flap Operation

The flaps operate in sequence with the slats. At cruise speed and altitude, flap extension is inhibited.
The load relief function retracts the flaps to prevent structural damage to the flaps at high airspeeds.
The flaps are monitored for skew or asymmetry. When the system detects a skew or asymmetry, the flap drive shuts down.
Abbreviations and Acronyms
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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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EICAS -engine indication and crew alerting system

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EXT -extend

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FSEU -flap/slat electronics unit

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HLCS -high lift control system

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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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retr -retract

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RVDT -rotary variable differential transformer

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sec -secondary

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TE -trailing edge

 

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TRAILING EDGE FLAPS -INTRODUCTION

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TRAILING EDGE FLAPS -GENERAL DESCRIPTION

General
The flaps operate in one of three modes:
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Primary mode

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Secondary mode

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Alternate mode.

 

The primary mode uses hydraulic power to operate the flaps. The secondary and alternate modes use electrical power to operate the flaps.
Primary Mode

The primary mode has a closed-loop control system. The pilot commands the flaps with the flap lever. The flap lever position sensor sends input signals to the FSEUs. The FSEUs use the flap lever position to calculate the flap commands. The FSEUs also receive data from the systems ARINC 629 buses.
The FSEUs send the flap commands to the flap primary control valve. This valve supplies hydraulic power to the flap power drive unit (PDU). The hydraulic motor on the PDU then moves the flap mechanisms.
The flap/slat priority valve controls the amount of hydraulic flow to the flap primary control valve. The flap/slat priority valve gives priority of hydraulic power to the primary flight control system (PFCS) over the HLCS.
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As the flaps move, the flap position sensors send feedback signals to the FSEUs. The FSEUs stop the flap commands when the feedback signals equal the commanded position.
　
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