*
Transponder panel.
The MD&T card file supplies power for operation but does not do a test of the operation of these lights:
*
Left and right engine fire switches
*
APU fire switch
*
Left and right fuel cutoff switches.
See the fire protection -fire/overheat test section for more information about a test that does a check of the lights for the engine and the APU fire switches and the fuel cutoff switches (SECTION 26-00).
If you hold the indicator light switch in the TEST position for more than ten seconds, most indicator lights change to the dim mode of operation. These indicator lights do not dim, they stay bright:
* ON BAT light for the ADIRU
* AVAIL lights for the primary and secondary external power switches.
BRT Mode
The BRT position of the indicator light switch sets the mode of operation for the indicators to bright.
The storm light switch can make the indicator lights operate in the bright mode. If the switch is set to ON and the indicator light switch is set to DIM, the lights operate in the bright mode.
DIM Mode
The DIM position of the indicator light switch sets the mode of operation for most indicators to dim. The storm light switch must be set to the out position to enable the dim mode. These indicators do not dim, they always operate bright even when you select DIM:
*
ON BAT light for the ADIRU
*
AVAIL light for the primary external power switch
*
AVAIL light for the secondary external power switch.
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777 AIRCRAFT MAINTENANCE MANUAL
MASTER DIM AND TEST -INTRODUCTION
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MASTER DIM AND TEST -LOCATION
Location
The indicator lights switch is on the P5 overhead panel.
The P29 master dim and test (MD&T) card file is behind a panel (not shown) in the coat storage closet in the flight deck. The MD&T cards (not shown) are in the P29.
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777 AIRCRAFT MAINTENANCE MANUAL
MASTER DIM AND TEST -LOCATION
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MASTER DIM AND TEST -MASTER DIM AND TEST CARD FILE AND CARDS
Purpose
The P29 master dim and test card file has three master dim and test cards and one master bright control card. See the integral panel lights section for more information about the master bright control card (SECTION 33-13).
The master dim and test cards control these functions:
*
Brightness of most of the indicator lights in the flight deck
*
Test for most indicator lights
*
Test signal to LCD windows in some panels and some LCD indicators.
Location
The card file is behind a panel (not shown) in the coat storage area in the flight deck.
The cards are in the P29 card file.
Physical Description
The card file has these parts:
*
Four slots for printed circuit (PC) cards
*
Hinged access door
*
Electrical connector (5)
*
Electrostatic ground jack.
The cards are a printed circuit type that are electrostatic sensitive. Each card has two independent control channels.
Training Information Point
The card file and the cards are LRUs. The MD&T cards are the same.
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MASTER DIM AND TEST -MASTER DIM AND TEST CARD FILE AND CARDS
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MASTER DIM AND TEST -FUNCTIONAL DESCRIPTION 1
Cards
Each of the MD&T cards have two independent control channels. These are the channels:
*
Card 1 has channels 1 and 2
*
Card 2 has channels 3 and 4
*
Card 3 has channels 5 and 6.
All control channels supply brightness control and test for different groups of indicator lights.
Channel 1 also gives a test command to the rudder trim indicator and to the B processor (not shown) in the mode control panel (MCP) for the LCD windows in that panel.
Channel 3 also gives a test command to the captain stabilizer position indicator.
Channel 4 gives a bright mode command or a test command to the ON and AVAIL lights in the primary and secondary external power switches. This channel also gives a test command to the transponder panel for the LCD window in that panel.
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