*
The engage clutch
*
The motor.
Mode Control Panel LRU Replacement Test
The mode control panel LRU replacement test isolates faults to the:
*
AFDC (left, center, or right)
*
MCP
*
MCP/AFDC interface.
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AFDS -LRU TESTS
TO/GA Switch LRU Replacement Test
The TO/GA switch LRU replacement test makes sure all contacts of both TO/GA switches operate correctly. The TO/ GA switches interface with all AFDCs and AIMS cabinets.
During the test, the MAT tells you to operate the left and right go-around switches one at a time. The test makes sure all AFDCs and AIMS cabinets receive the correct results.
The TO/GA switch LRU replacement test isolates faults to the:
*
AFDC (left, center, or right)
*
TO/GA switch
*
TO/GA switch analog interface with all AFDCs and AIMS cabinets.
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777 AIRCRAFT MAINTENANCE MANUAL
AFDS -LRU TESTS
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AFDS -SYSTEM TESTS
General
The AFDS system tests verify the correct functionality of the AFDS.
Autopilot Disconnect Warning System Test
The autopilot disconnect warning system test makes sure these functions are correct:
*
Installation and operation of the A/P disengage switches
*
28v dc battery power input to the AFDCs
*
A/P analog cross-channel discretes
*
AFDS-WES analog interfaces
*
AFDS-AIMS cabinet analog interfaces
*
AFDC disengage warning monitors.
During the test, the MAT tells you to operate the captain’s and first officer’s disengage switches. You then make sure these functions operate correctly:
*
The aural warning
*
The master warning lights
*
The EICAS messages.
AFDCs System Test
The test program for the AFDCs system test causes all three AFDCs to do a self-test and interface test. This test detects these:
* AFDC internal failures
EFFECTIVITY
BEJ ALL
*
Analog signals that are not in their normal state when the airplane is on the ground and is not moving
*
ARINC 629 input bus inactivity
*
ARINC 429 input bus inactivity
*
Incorrect ILS or RA to AFDC connections. For example, left ILS receiver or radio altimeter transceiver not connected to the left AFDC.
Backdrive Actuator System Tests
These tests operate like the LRU replacement tests for the control column, control wheel, or rudder pedal actuators. The tests also do a check of dual backdrive functions.
This test isolates the same faults as the backdrive actuator LRU replacement tests and these:
*
Actuator polarity faults
*
Single actuator drive faults
*
Dual actuator drive faults
*
AFDC backdrive monitor faults.
ILS Interface System Test
The ILS interface system test makes sure these functions are correct for all three AFDCs:
*
Localizer antenna switches
*
Glideslope antenna switches
*
ILS tune inhibit.
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AFDS -SYSTEM TESTS
During the test, the AFDCs operate these functions to make sure all signal wires are correct:
*
Tune inhibit discrete
*
Localizer antenna switches
*
Glideslope antenna switches.
Mode Control Panel System Test
The MCP system test makes sure these functions are correct:
*
All MCP switches, selectors and displays
*
MCP panel variable lighting
*
MCP configuration pins
*
Autothrottle switch discrete output to AIMS
*
ARINC 429 bus output to AIMS and the AFDCs
*
ARINC 429 inputs from the AFDCs
*
Disengage bar discrete outputs to the AFDCs
*
Disengage bar discrete inputs from the AFDCs
*
Input activity for all buses
*
AFDC MCP flight fault monitors.
During the test, the MAT tells you to operate all switches and selectors applicable to the MCP. You also visually monitor the displays on the MCP for correct results.
This MCP system test isolates the same faults as the MCP LRU replacement test and these:
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