*
Standby airspeed indicator
*
Standby altimeter
*
Standby compass
*
Captains radio tuning frequency window
*
TCAS/ATC control panel.
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INTEGRAL PANEL LIGHTS -FUNCTIONAL DESCRIPTION -MANUAL ADJUSTMENTS
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INTEGRAL PANEL LIGHTS -FUNCTIONAL DESCRIPTION -AUTOMATIC ADJUSTMENTS
General
The integral lights in some components have automatic brightness control and manual brightness control. These components have automatic brightness control:
*
TCAS/ATC control integral panel
*
Captain radio tuning frequency windows
*
Center radio tuning frequency windows
*
First officer tuning frequency windows
*
Rudder trim indicator
*
Left stab position indicator
*
Right stab position indicator
*
Standby instruments
*
Primary display system.
See section 34-11 for more information on the automatic brightness control for the standby instruments.
See section 31-61 for more information on the automatic brightness control for the primary display system.
Functional Description
There are two sets of light sensors. Two remote light sensors (RLS) are on the glare shield and three bezel-light sensors (BLS) are on the aisle stand. There are bezel-light sensors in these components:
*
Rudder trim indicator
*
Right stab position indicator
EFFECTIVITY
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* Left stab position indicator.
The bezel-light sensors send ambient light information to the MBC card. The MBC card uses the manually selected brightness level and adjusts the output signal based on inputs from the bezel-light sensors. The MBC card then uses the remote light sensor inputs and adjusts the output signal more. The MBC card then sends an output to the dimmer control units. The dimmer control units adjust the brightness for these components:
*
TCAS/ATC control integral panel lights
*
Captain radio tuning frequency windows
*
Center radio tuning frequency windows
*
First officer tuning frequency windows.
The MBC card also adjusts the brightness for these components without the use of a dimmer control unit:
*
Rudder trim indicator
*
Right stab position indicator
*
Left stab position indicator.
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INTEGRAL PANEL LIGHTS -FUNCTIONAL DESCRIPTION -AUTOMATIC ADJUSTMENTS
Standby Mode
Critical dimmer control units get power from the 115v ac standby bus when power is not available from the left 115v ac transfer bus. The 115v ac standby bus energizes the standby dimmer control relay. 115v ac standby bus power then goes to the critical dimmer control units. The critical dimmer control units then supply power to the respective panel lights. You can not adjust the light intensity of these panel lights from the MBC. You can only adjust the light intensity from the related individual panel light control. These integral panel lights and instruments have power when the lights are in the standby mode:
*
Captains radio tuning frequency window
*
TCAS/ATC control panel.
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FLIGHT COMPARTMENT MISCELLANEOUS LIGHTS -INTRODUCTION
General
The flight compartment miscellaneous lights give light to specific areas in the flight compartment. These lights are the flight compartment miscellaneous lights:
*
Utility light
*
Map light (4)
*
Chart light (2)
*
Worktable light (2)
*
Floor light (3).
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