777 AIRCRAFT MAINTENANCE MANUAL
WES -COMPONENT LOCATIONS 1
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WES -COMPONENT LOCATIONS 2
General
The WES components in the flight deck, show on the graphic.
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WES -COMPONENT LOCATIONS 2
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WES -POWER INPUTS
General
Each WEU receives two 28v dc inputs, one for each internal channel.
Each aural warning speaker and each stick shaker actuator receives 28v dc for operation.
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WES -POWER INPUTS
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WES -DIGITAL INTERFACES
ARINC 629 Interface
Each WEU channel connects to two system ARINC 629 buses.
Left WEU channel 1 (L1) transmits to and receives data from the left bus. Channel L1 only receives data from the center 1 bus.
Left WEU channel 2 (L2) transmits to and receives data from the center 1 bus. Channel L2 only receives data from the left bus.
Right WEU channel 1 (R1) transmits to and receives data from the right bus. Channel R1 only receives data from the center 1 bus.
Right WEU channel 2 right (R2) transmits to and receives data from the center 1 bus. Channel R2 only receives data from the right bus.
ARINC 629 Value Selection
One ARINC 629 data bus can have the same data value more than once. For example: radio altitude data from the left, center, and right radio altimeter transceivers is on the left system ARINC 629 bus.
Each WEU channel uses data from one ARINC 629 bus input.
Left WEU channel 1 (L1) uses data from the left bus. If a data value in the left bus fails, channel L1 uses the same data value from the center 1 bus.
Left WEU channel 2 (L2) uses data from the center 1 bus. If a data value in the center 1 bus data fails, channel L2 uses the same data value from the left bus.
Right WEU channel 1 (R1) uses data from the right bus. If a data value in the right bus fails, channel R1 uses the same data value from the center 1 bus.
Right WEU channel 2 (R2) uses the center 1 bus. If a data value in the center 1 bus fails, channel R2 uses the same data value from the right bus.
Proximity switch electronic unit (PSEU) data selection is also different from the previous explanation. If at least one PSEU supplies a good data value to the WEUs, the WEUs use that data value.
ARINC 429 Inter-Channel Buses
Each WEU channel receives data from the opposite WEU on an ARINC 429 bus. Each WEU channel transmits data to the opposite WEU on an ARINC 429 bus.
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WES -DIGITAL INTERFACES
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WES -ANALOG INTERFACES -1
Autopilot Disconnect
The three autopilot flight director computers (AFDCs) supply autopilot disconnect ground signals to the WEUs when the autopilot disconnects. The WEUs use these inputs to make the master warning lights come on and make a siren aural.
Nose Gear Pressure Switch
The nose gear pressure switch supplies an aft or forward center of gravity (CG) signal to the WEUs. The WEUs use this input to verify stabilizer green band calculations.
Alternate Gear Down Dispatch Switch
The alternate gear down dispatch switch supplies three ground discrete signals to each WEU. When the switch is in the maximum operating speed (VMO) position, the WEUs use these signals to modify the maximum operating speed (VMO) and maximum operating mach (MMO).
Ground Proximity Gear Override Switch
The ground proximity gear override switch supplies an on/off signal to the WEUs. The WEUs use this input to inhibit the landing configuration warning siren.
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Master Warning Light Interface
The left WEU makes the left master warning light come on. The right WEU makes the right master warning light come on. Each of the two channels in each WEU supplies a master warning arm signal to the opposite WEU. The master warning lights come on when at least two channels generate the master warning light on command.
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