777 AIRCRAFT MAINTENANCE MANUAL
PFCS -ELECTRICAL POWER DISTRIBUTION
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PFCS -HYDRAULIC POWER AND ACE DISTRIBUTION
Hydraulic Power Distribution
All three hydraulic systems supply power to operate the PCUs of the primary flight controls. The hydraulic distribution is:
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The left aileron: L and C
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Spoiler 1: C
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Spoiler 2: L
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Spoiler 3: R
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Spoiler 4: L
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Spoiler 5: C
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The left flaperon: L and R
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Spoiler 6: R
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Spoiler 7: C
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Spoiler 8: C
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Spoiler 9: R
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The right flaperon: R and C
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Spoiler 10: C
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Spoiler 11: L
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Spoiler 12: R
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Spoiler 13: L
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Spoiler 14: C
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The right aileron: C and L
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The left elevator: L and C
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The right elevator: R and L
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The rudder: L, C and R
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The stabilizer actuator: C and R.
ACE Distribution
The distribution of the four ACEs among the PCUs is in a manner that each PCU for a surface receives commands from a different ACE. The distribution is:
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The left aileron: L2 and C
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Spoiler 1: C
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Spoiler 2: L1
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Spoiler 3: R
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Spoiler 4: L2
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Spoiler 5: L2
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The left flaperon: L1 and R
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Spoiler 6: R
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Spoiler 7: C
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Spoiler 8: C
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Spoiler 9: R
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The right flaperon: L2 and C
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Spoiler 10: L2
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Spoiler 11: L2
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Spoiler 12: R
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Spoiler 13: L1
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Spoiler 14: C
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The right aileron: R and L1
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The left elevator: L1 and C
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The right elevator: R and L2
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The rudder: L1, C and R
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The stabilizer actuator: L1 and C for the left motor/brake, and R and L2 for the right motor/brake.
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PFCS -HYDRAULIC POWER AND ACE DISTRIBUTION
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PFCS -ACE -COMPONENT LOCATION
Purpose
The actuator control electronics (ACE) supplies interfaces between the pilot controls and the ARINC 629 buses. The ACE controls the power control units (PCU) for the ailerons, flaperons, spoilers/speedbrakes, elevators and rudder.
The ACE controls the stabilizer through two stabilizer trim control modules (STCM). The ACE also controls the rudder trim actuator and the elevator feel actuator.
Physical Description
The ACE weighs approximately 23 lb (10 kg). The ACE is actively cooled.
There are ten program pin pairs on each ACE. The program pins supply information on ACE location and airplane configuration.
Location
The four identical ACEs are:
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L1 ACE (left 1)
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L2 ACE (left 2)
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C ACE (center)
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R ACE (right)
There are three ACEs in the main equipment center:
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C ACE on shelf E2-5
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L2 ACE on shelf E1-1
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L1 ACE on shelf E1-5
The R ACE is on the E5-2 shelf, aft of the forward cargo door.
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777 AIRCRAFT MAINTENANCE MANUAL
PFCS -ACE -COMPONENT LOCATION
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777 AIRCRAFT MAINTENANCE MANUAL
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PFCS -ACE -FUNCTIONAL DESCRIPTION
General
The ACE is a signal converter and controls the direct mode.
The primary functions of the ACE are:
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A/D converter
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D/A converter
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Direct mode select logic
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Direct mode command calculation
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PCU servo loop control
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Excitation power supply.
The ACE operates in all three PFCS modes. Operation of the ACE in direct mode is different than in normal and secondary mode. In normal and secondary mode, the ACE relays input signals from airplane sensors to the PFC and command output signals from the PFC to the PCUs. In direct mode, the ACE processes the input signals with internal hardware and sends command output signals to the PCUs. 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(6)
