*
28v dc battery section 2 bus, power for card 2 and for the engine fire switches and the engine fuel cutoff switches
*
28v dc right main bus, power for card 3.
The MD&T card file supplies power to the engine fire switches and to the engine fuel cutoff switches.
BITE
Each card has an MD&T BITE monitor. When there is a channel failure, a signal goes to the overhead panel ARINC 629 system (OPAS). OPAS supplies the signal to AIMS. AIMS gives a maintenance message on the MAT.
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MASTER DIM AND TEST -FUNCTIONAL DESCRIPTION 1
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MASTER DIM AND TEST -FUNCTIONAL DESCRIPTION 2
General
The master dim and test (MD&T) system does these tasks:
*
Gives high power to flight deck indicator lights when it is in the bright mode.
*
Gives low power to flight deck indicator lights when it is in the dim mode.
*
Supplies a ground during test to make flight deck indicator lights come on in the bright mode and then go to the dim mode.
*
Gives a test signal to some LCD windows.
*
Monitors channel operation and reports failures to AIMS.
Bright
When the indicator light switch is in the BRT position, the power that goes to the indicator lights is 28v dc or 5v dc. The type of power for the bright mode is dependent on the indicator type.
Dim
When the indicator light switch is in the DIM position, it sends a signal to the MD&T channel in the MD&T PC dimmer card. A switch closes and supplies a ground for the dim relay. The MD&T power supplies send less power to the indicator lights.
Test
When the indicator light switch is held in the TEST position, the MD&T channel supplies a ground for the indicator lights. Most of the lights come on fully bright. After ten seconds, a switch closes and supplies a ground to the dim relay. This makes most of the lights go to the dim mode.
The test position also starts a self test on some LCDs that cause them to show some temporary test patterns.
Storm
When the storm light switch is in the ON position, the indicator lights come on full bright. The signal from the storm light switch prevents the dim relay from closing unless a test is selected.
See the flight compartment illumination section for more information about the storm light switch (SECTION 33-11).
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MASTER DIM AND TEST -FUNCTIONAL DESCRIPTION 2
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MASTER DIM AND TEST -OPERATION
Operation
You use the indicator lights switch (IND LTS) to set the mode of operation for the master dim and test (MD&T) system.
The table shows the system response for the three modes of operation.
Training Information Point
The storm light switch on the P5 passenger sign/lighting panel (not shown) has an effect on the mode of operation for the MD&T system. When the switch is set to ON, it makes the MD&T system operate in the bright mode. The storm light switch does not have an effect on the TEST mode.
See the flight compartment illumination section for more information about the storm light switch (SECTION 33-11).
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777 AIRCRAFT MAINTENANCE MANUAL
MASTER DIM AND TEST -OPERATION
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
PASSENGER COMPARTMENT LIGHTS -INTRODUCTION
General
The passenger compartment lights has these subsystems:
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Passenger compartment illumination lights
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Passenger loading lights
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Reading lights
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Information signs
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Lavatory call lights and master call light modules
*
Lavatory lights and signs
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