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HIGH LIFT CONTROL -INTERFACES -SYSTEM REDUNDANCY
Fault Annunciation
The status message FLAP/SLAT CONTROL 1 shows if:
*
A component fails in lane 1
*
The command and feedback disagree in lane 1.
The same logic is true for the FLAP/SLAT CONTROL 2 status message in lane 2.
The caution message FLAP/SLAT CONTROL shows if both lanes fail.
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HIGH LIFT CONTROL -INTERFACES -SYSTEM REDUNDANCY
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D633W101-BEJ Jan 05/2002
HIGH LIFT CONTROL -INTERFACES -SYSTEMS ARINC 629 BUSES
General
The FSEUs connect the HLCS to many other airplane systems through the systems ARINC 629 buses. Some of these systems use these components:
*
Two warning electronics units (WEUs)
*
Two airplane information management system (AIMS) cabinets
*
Two systems card files.
FSEU Interface
The FSEUs connect to three of the systems ARINC 629 buses. FSEU 1 transmits and receives data on the left and center 1 buses through separate connections. FSEU 1 receives data through two more connections for redundancy.
The connections for FSEU 2 are almost the same as the connections for FSEU 1. The difference is that the FSEU 2 communicates with the right and C1 buses instead of the left and C1 buses.
WEU Interface
The WEUs transmit data for the autoslat function.
AIMS Interface
The FSEUs supply information to the AIMS for:
* The flap/slat position indications on EICAS
*
The flap/slat maintenance page
*
The central maintenance computing system (CMCS)
*
The protection functions in the primary flight control system (PFCS)
*
And many other systems and functions.
Information that the FSEUs receive from the AIMS cabinets include air data from the ADIRU and SAARU and data from many other systems.
Systems Card File Interface
The hydraulic interface module (HYDIM) and the weight on wheels (WOW) cards are in the systems card file.
The HYDIM cards supply hydraulic pressure data to the FSEUs. The center hydraulic isolation system command from the HYDIM cards disables the slats in the primary mode. The FSEUs also send the flap and slat commands to the HYDIM cards.
The WOW cards supply air/ground data to the FSEUs.
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HIGH LIFT CONTROL -INTERFACES -SYSTEMS ARINC 629 BUSES
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777 AIRCRAFT MAINTENANCE MANUAL
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HIGH LIFT CONTROL -INTERFACES -ANALOG AND DISCRETE SIGNALS
General
These components electrically control the flaps and slats in the primary, secondary, and alternate modes:
*
FSEUs
*
Flap lever position sensor
*
Alternate flaps arm switch
*
Alternate flaps selector
*
Flap and slat primary control valves
*
Autoslat priority valve
*
Secondary/alternate control relays
*
Flap and slat position sensors
*
Flap and slat skew sensors.
The ACEs receive flap position discrete signals from the FSEUs for some of the functions in the PFCS.
FSEUs
The two FSEUs use analog and discrete inputs to calculate the flap and slat commands in the primary and secondary modes. They also use digital information on the systems ARINC 629 buses.
Flap Lever Position Sensor
The flap lever position sensor sends the flap lever commands to the FSEUs.
Alternate Flaps Arm Switch
The alternate flaps arm switch sends a discrete to the FSEUs to disengage the primary and secondary modes. This switch also controls two relays, which control power to a solenoid in the flap and slat primary control valves.
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