Warning
The AFDCs send the AUTOPILOT DISC warning message request to the AIMS when either of these happens:
*
The flight crew disconnects all engaged AFDCs
*
All engaged AFDCs automatically disconnect.
The wheel disconnect switch resets the AUTOPILOT DISCONNECT warning.
The wheel disconnect switch tests the AUTOPILOT DISCONNECT warning if the autopilot is not engaged. The warning resets when the flight crew releases the switch.
EFFECTIVITY
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Caution
The AFDCs send these autopilot caution messages requests to the AIMS:
*
AUTOPILOT, when an autopilot mode fail occurs
*
NO LAND 3, when autoland capability degrades while in approach after LAND 3 shows. This only occurs above 200 feet radio altitude
*
NO AUTOLAND, when all autoland capability is lost during approach after LAND 2 or LAND 3 has shown. This also occurs during approach if LAND 2 or LAND 3 is not active by 600 feet radio altitude.
Advisory
The AFDCs send these advisory message requests to the AIMS:
*
NO LAND 3, when autoland capability degrades before the LAND 3 autoland status annunciation shows
*
NO AUTOLAND, when loss of all autoland capability occurs before the LAND 3 or LAND 2 autoland status annunciation shows.
Status
The AFDCs send these autopilot status message requests to the AIMS:
*
AFDC L, R, or C; when an AFDC does not operate
*
AUTOPILOT BACKDRIVE L or R, when the left or right backdrive system does not operate
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AFDS -FUNCTIONAL DESCRIPTION -WARNING AND ANNUNCIATIONS -EICAS DISPLAYS
*
MODE CTRL PANEL LANE, when one of the two lanes in the AFDS MCP or its interface to the AFDC fails
*
NO AUTOLAND, when loss of all autoland capability occurs
*
NO LAND 3, when the NO LAND 3 caution or advisory message shows
*
NO LAND 3, autoland capability degrades during approach when the airplane is below 200 feet radio altitude. There is no caution or advisory message.
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AFDS -FUNCTIONAL DESCRIPTION -WARNING AND ANNUNCIATIONS -EICAS DISPLAYS
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AFDS -SPECIAL FUNCTIONS
General
You can select these two special functions on the MAT:
*
Localizer antenna switching
*
Glideslope antenna switching.
The AFDS special functions make the localizer and glideslope switches change position. You use these special functions during ILS system troubleshooting.
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777 AIRCRAFT MAINTENANCE MANUAL
AFDS -SPECIAL FUNCTIONS
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AFDS -LRU TESTS
General
The LRU replacement tests verify the correct installation of an LRU.
Autopilot Disconnect Switch LRU Replacement Test
The autopilot disconnect switch LRU replacement test makes sure all contacts of the captain’s and first officer’s disconnect switches operate correctly.
During the test, the MAT tells you to operate the captain’s and first officer’s disconnect switches one at a time. The test makes sure all AFDCs receive the correct results.
The autopilot disconnect switch LRU replacement test isolates faults to:
*
The AFDC (left, center, or right)
*
The captain’s disconnect switch
*
The first officer’s disconnect switch.
AFDC LRU Replacement Tests
The left, right, or center AFDC LRU replacement test causes the AFDC self-test and interface test to start. At the end of the test, the MAT shows AFDC internal and interface faults.
Backdrive Actuator LRU Replacement Tests
All backdrive actuator LRU replacement tests make sure the backdrive electrical signal wires are good. They also make sure the flight deck controls move to the correct position at the correct rate. The left or right AFDC:
*
Calculates the backdrive command
*
Engages its backdrive actuator
*
Drives its backdrive actuator.
The backdrive actuator LRU replacement tests isolate faults to:
*
The AFDC (left or right)
*
Tachometer A
*
Tachometer B
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