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MAINTENANCE MANUAL

M7351 R-EIU  S1926 F/O MASTER 
(E2-6)  CAUTION LIGHT (P72) 
IDS - EICAS 
Figure 4 (Sheet 2) 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (1)  
Doors (Chapter 52-00)

 (2)  
Landing Gear (Chapter 32-00)

 (3)  
Fuel (Chapter 28-00)

 (4)  
Hydraulic Power (Chapter 29-00)

 (5)  
Electrical Power (Chapter 24-00)

 (6)  
Air Conditioning (Chapter 21-00)

 (7)  
Engine (Chapters 70-00 thru 80-00)

 (8)  
Flight Controls (Chapter 27-00)

 (9)  
Oxygen (Chapter 35-00)

 (10)
 Fire Protection (Chapter 26-00)

 (11)
 Ice and Rain Protection (Chapter 30-00)

 (12)
 Airborne Auxiliary Power (Chapter 49-00)

 (13)
 Leveling and Weighing (Chapter 08-00)

 D.  Some miscellaneous airplane systems which interface with the IDS are listed below.
 (1)  
ARINC Communication Addressing and Reporting System (ACARS) (Chapter 23-27)

 (2)  
Aural Warning System (Chapter 31-51)

 (3)  
Flight Data Recording System (Chapter 31-31)

 3.  IDS Components
______________
 A.  Integrated Display Unit (Fig. 1)
 (1)  
The IDS consists of six integrated display units to present EFIS and EICAS data. Two integrated display units are for the CAPT's PFD and ND, and two integrated display units are for the F/O's PFD and ND. A further two integrated display units are for the main EICAS and auxiliary EICAS. The integrated display units are fully interchangeable and are capable of serving as NDs, PFDs, or EICAS.

 (2)  
The intensity of the integrated display unit can be controlled manually or automatically through the IDU's brightness/dimming control circuitry.

 (a)  
Manual brightness/dimming control circuitry varies the stroke/raster brightness of the integrated display unit in a log/linear fashion. There are pilots' PFD and ND brightness controls located on the P72 panel, and pilots' EICAS brightness controls located on the EICAS control panel.

 (b)  
The automatic brightness circuitry compensates the display brightness level as a function of ambient lighting, as measured by a integrated display units local integral light sensor. Automatic contrast circuitry compensates the display contrast level as a function of ambient lighting, as measured by a remote light sensor.

 (3)  
The integrated display units require 115 volts 400 hertz, single phase power. Each integrated display unit has an internal temperature sensor circuit. When the sensor detects an overheat condition, the integrated display unit goes blank and the EICAS annunciates the "IDS CRT" status message. When the temperature drops below the threshold temperature, the integrated display unit resumes normal operation.

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MAINTENANCE MANUAL

 (4)  The integrated display units receive and transmit various interface signals to and from different systems.
 (a)  
Digital inputs 1) Weather radar: very high speed ARINC 453 bus 2) EIU: high speed ARINC 429 bus 3) FMC: high speed ARINC 429 bus 4) Data loader: high speed ARINC 429 bus
　
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