777 AIRCRAFT MAINTENANCE MANUAL
PFCS -GENERAL DESCRIPTION
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PFCS -COMPONENT LOCATION
Flight Deck Controls
The control wheel, control column, and rudder pedal position transducers are below the flight deck floor in the forward equipment center. The speedbrake lever position transducers are in the control stand. The location of these transducers is shown in other sections.
Main Equipment Center
The E1, E2, and E3 racks contain most of the electronic equipment of the PFCS.
The E1 rack contains:
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The left PFC
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The L1 ACE
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The L2 ACE.
The E2 rack contains:
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The center PFC
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The center ACE
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The SAARU.
The E3 rack contains the ADIRU.
Forward Cargo Compartment
The E16 rack, forward of the forward cargo door, contains the right PFC.
The E5 rack, aft of the forward cargo door, contains the right ACE.
Control Surfaces
Each PCU connects directly to its related control surface on the wing and the empennage. The ballscrew actuator of the horizontal stabilizer is in the stabilizer compartment. The location of the PCUs and the ballscrew actuator is shown in their specified sections.
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777 AIRCRAFT MAINTENANCE MANUAL
PFCS -COMPONENT LOCATION
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777 AIRCRAFT MAINTENANCE MANUAL
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PFCS -FLIGHT CONTROLS ARINC 629 BUS INTERFACES
General
ARINC 629 digital data buses supply the principal means of communication among airplane systems. Three dedicated flight controls ARINC 629 buses connect the PFCS to:
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The three autopilot flight director computers (AFDC)
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The two airplane information management system (AIMS) cabinets
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The air data inertial reference unit (ADIRU)
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The secondary attitude air data reference unit (SAARU).
Physical separation of the buses, and redundant LRUs, protects against multiple failures due to one event.
PFCS Interface
The three primary flight computers (PFCs) and the four actuator control electronics (ACEs) have interfaces with the flight controls data buses.
The L PFC, C PFC and R PFC receive data from all three flight controls data buses but transmit data only on their on-side data bus. (On-side means that the relationship is with equipment of the same side. For example, the left bus is the on-side bus for the left PFC.)
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Each ACE receives data from all three PFCs through the three flight controls data buses. Each ACE processes control data from its on-side PFC. If this data is not valid, the ACE processes data from an alternate PFC. The ACEs process some data from the other PFCs at all times. For example, this occurs during data validation and voted commands. The ACEs transmit only on their on-side bus.
AFDS Interface
The autopilot flight director system (AFDS) interfaces with the PFCS through the autopilot flight director computers (AFDCs). Each AFDC transmits to its on-side flight controls data bus, but receives data from all three buses. The AFDCs receive backdrive commands, engagement status, and other data from the PFCs. The AFDCs transmit pitch, roll and yaw commands and engage requests to the PFCs.
AIMS Interface
The two AIMS cabinets receive data from all three flight controls data buses, but normally transmit only to their on-side bus. During tests on the ground, the AIMS cabinets transmit also to the center bus.
The PFCS supplies information to the AIMS for:
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The primary display system (PDS), (flight, synoptic, and EICAS displays)
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The central maintenance computing system (CMCS)
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The airplane condition monitoring system (ACMS)
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PFCS -FLIGHT CONTROLS ARINC 629 BUS INTERFACES
* The flight management computing system (FMCS)
ADIRS Interface
The air data inertial reference system (ADIRS) consists of the air data inertial reference unit (ADIRU) and the secondary attitude air data reference unit (SAARU). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 飞行操纵 Flight Controls 1(3)
