PRIMARY DISPLAY SYSTEM -POWER INTERFACES
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PRIMARY DISPLAY SYSTEM -BRIGHTNESS CONTROL INTERFACES
General
The display units (DUs) get brightness control inputs manually and automatically. Each display unit has a built-in bezel light sensor (BLS) for automatic brightness control. A remote light sensor (RLS) on the glareshield also supplies automatic brightness control to the onside outboard DU. The passenger sign module also sends automatic brightness control inputs to the outboard DUs.
Control panels in the flight deck have individual manual brightness controls for each display unit. Additional manual brightness controls are available for the display units (DUs) that show weather radar (WXR).
Automatic Brightness Control
Each display unit has a BLS on the front of the unit that measures ambient light. The automatic brightness control calculation uses two BLSs and an RLS input to adjust the DU brightness of the six DUs.
The brightness of a DU pair changes automatically based on the calculation of the brightest value the pair gets from their BLSs.
Each outboard DU sends an excitation voltage to its respective RLS. The RLS sends a signal back to its DU. The signal changes with the amount of light in the forward part of the flight deck.
Manual Brightness Control
The master brightness control on the passenger sign module sends a zone brightness input to the left and right outboard display units.
The captain’s and first officer’s forward panel brightness controls have controls for their outboard and inboard display units. These controls are on the sidewall panels. There is a single control for the outboard display units. There is a dual control knob for the inboard display units. The outer knob controls display brightness and the inner knob controls WXR brightness.
The center display control panel has a single knob to control the brightness of the upper center display unit. There is a dual control knob for the lower center display unit. The outer knob controls display brightness and the inner knob controls weather radar brightness when weather radar information shows on the lower center display unit.
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PRIMARY DISPLAY SYSTEM -BRIGHTNESS CONTROL INTERFACES
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PRIMARY DISPLAY SYSTEM -ARINC 429 DATA BUS INTERFACES
General * Program pin data
* CCD version number.
These components send data to the input/output modules The inputs go to multiple IOMs in both cabinets. The multiple
(IOMs) in the two AIMS cabinets on ARINC 429 data buses: inputs provide for redundancy.
*
Six display units
*
Two EFIS control panels
*
Two cursor control devices (CCDs).
Display Unit Interface
The display units send:
*
Fault monitoring data
*
Brightness sensor values
*
Remote light sensor values
*
Manual brightness values.
EFIS Control Panel Interface
The EFIS control panels send switch position data to control the operation of the related primary flight display and navigation display.
Cursor Control Device Interface
The cursor control devices send:
*
Cursor position data
*
Display cursor position switch discretes
*
Cursor activation switch discrete
*
CCD status
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PRIMARY DISPLAY SYSTEM -ARINC 429 DATA BUS INTERFACES
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PRIMARY DISPLAY SYSTEM -DISPLAY UNIT COAX INTERFACES
General
The display units get data from the AIMS graphic generators through coax buses. Each AIMS cabinet has two graphics generators, each with a bus output. Each bus output is split six ways and goes to each DU.
The data from the graphics generators contains instructions that make the symbols on the DUs.
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PRIMARY DISPLAY SYSTEM -DISPLAY UNIT COAX INTERFACES
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PRIMARY DISPLAY SYSTEM -OPAS INTERFACE
General
The overhead panel ARINC 629 system (OPAS) continuously receives and monitors flight deck switches and lights, processes and formats the data, and transmits the data. OPAS uses the left and right systems ARINC 629 data buses. OPAS supplies two outputs to each of the primary display functions of AIMS.
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