(3)  
A normal EICAS configuration is when two DUs are available to display EICAS data. Full-time EICAS data is displayed on the main display, while supplemental data (displayed as required) is on the auxiliary display.

 (4)  
The main display is normally on the center-upper DU, while the auxiliary display is normally on the center-lower DU.

 (5)  
Manual and automatic switching is provided, to select the main display onto the center-lower DU. The display on the center-lower DU (main or auxiliary) can be manually selected onto the ND position. (Fig. 7)

 B. Main Display
 (1)  Primary engine parameters are continuously presented on the main display. These parameters are: EPR actual, EPR reference/target, EPR maximum, EGT, N1, thrust mode and TAT. Crew alerting warning, caution, advisory, and memo messages are also presented on the main display.
 C. Auxiliary Display
 (1)  
Secondary engine parameters, synoptic displays, maintenance pages or the status format can be presented individually on the auxiliary display.

 (2)  
Secondary Engine Parameters

 (a)  These parameters are N2, oil pressure, oil quantity, oil temperature and engine vibration.

 (3)  
Synoptic Displays

 (a)  Synoptic displays provide pictorial views of system configurations and operating parameters for various airplane systems.
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 (4)  
Maintenance Displays

 (a)  
Maintenance displays (or pages) are of interest to maintenance personnel. These displays present system operating parameter data, in tabular form, for the following systems:

 Flight controls
 Fuel
 ECS
 Electrical
 Hydraulic
 Performance
 APU
 Configuration
 Engine exceedance
 EPCS
 Gear

 (b)  
The maintenance pages display real time data.

 (c)  
The maintenance pages also can show previously recorded data (snapshots). The snapshots are recorded either manually or automatically. Snapshots are stored in the memory of the EIU.

 (d)  
Real time displays are initiated through the Central
 Maintenance Computer (CMC).

 (e)  
Manual snapshots of all maintenance pages are done when you push the EVENT RCD switch on the EICAS control panel. Manual snapshots of selected maintenance pages are initiated through the Central Maintenance Computer (CMC). Automatic snapshots are initiated by a system fault or engine exceedance. An automatic record will save the current status of only the Maintenance Page on which the fault or exceedance occurred.

 (f)  
AIRPLANES WITH ACARS; A report of maintenance page data can be transmitted via ACARS. A maintenance page report (realtime, auto snapshot, or manual snapshot) contains two pages. The first page has the ACARS preamble and the EICAS maintenance page data. The second page has only the ACARS preamble. Ignore the empty second page.

 (5)  
Status Format

 (a)  
The status format provides information related to airplane dispatch.

 (b)  
Up to eleven status messages can be displayed at one time on this format. These status messages are used to determine the dispatchability of the airplane.

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 (c)  The status cue is inhibited after an on-the-ground engine start until either; the engine shuts down, the airplane lands or 30 minutes after takeoff.
 9. Crew Alerting/Status Messages (Fig. 32)
_____________________________
 A. General
 (1)  
Crew warning, caution, advisory and memo messages are displayed on the main EICAS display. Status messages are displayed on the auxiliary EICAS display.
　
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