Valve Information
The shutoff valve and reserve supply valve have four possible conditions. A valve open symbol is green with a vertical line. A valve closed symbol is white with a horizontal line. A valve invalid symbol is white with no line. A valve failed symbol is amber with an X.
The reserve isolation valve has four possible conditions. A valve normal symbol is green with a horizontal line. A valve isolation symbol is white with a wedge shaped horizontal line. A valve invalid symbol is white with no line. A valve failed symbol is amber with an X.
The nose gear and steering isolation valve has four possible conditions. A valve normal symbol is green with a horizontal line. A valve isolation symbol is white with a horizontal line. A valve invalid symbol is white with no line. A valve failed symbol is amber with an X.
Reservoir Quantity and Status
Reservoir quantity for each tank shows as a digital readout. The readout values go from 0.0 to 1.20. A readout of 1.0 means the reservoir is full. When the airplane is on the ground, messages show for low quantity (LO), overfill (OF) or refill (RF). The quantity readout is normally white. The OF and RF messages are white. During a low condition, both the quantity readout and the LO message are amber.
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PRIMARY DISPLAY SYSTEM -HYDRAULIC SYNOPTIC
System Pressure
System pressures show as digital readouts at the bottom the display.
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PRIMARY DISPLAY SYSTEM -ELECTRICAL SYNOPTIC

General
The electrical synoptic shows:
*
Bus information

*
Bus tie breakers position

*
Power flow

*
Generator drive status and control

*
Backup generator status

*
Battery information.

Bus information
Buses show as a legend in an oval symbol. For invalid conditions, the symbols and legends are white. For unpowered conditions, the symbols and legends are amber. With power applied, the symbols and legends are green.
Bus Tie Breakers
The bus tie breaker symbol is circuit breaker with two circular contacts. During normal operation the symbol is white when the breaker is open and green when the breaker is closed. When the breaker is isolated and the bus tie is commanded closed or tripped, the symbol is amber. During these conditions an amber isolation message (ISLN) shows also.
Power Flow
Power flow shows as green segments.
Power sources show as green boxes when power is available and as white boxes when power is not available. Logic equations determine which flow segments show.
Generator Drive and Control
The generator symbols have four conditions. The drive on symbol is a green box. The drive off and drive invalid symbols are white boxes. The drive failed symbol is an amber box with an X.
The generator control symbols have four conditions. The generator control breaker open and breaker invalid symbols are white boxes. The breaker closed symbol is a green box. The breaker failed symbol is an amber box with an X.
Backup Generator
The symbols for the backup generators are the same as the left and right generators.
Battery Information
Voltage, current, and battery charge status show for the main battery, and the APU battery.
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PRIMARY DISPLAY SYSTEM -MAINTENANCE PAGES OVERVIEW

General
There are 18 system maintenance pages. The maintenance pages supply information that is useful in the analysis and repair of airplane systems.
You can select and see maintenance pages any time the airplane is on the ground or any time the airplane is above ten thousand feet.
The information shows in real time or as a snapshot (manual event or auto event). Snapshots occur automatically when individual systems exceed established parameters. The operator can print or downlink the maintenance pages to ground stations.
You can also take a manual snapshot of all the maintenance pages or of individual maintenance pages.
Maintenance Page Controls
The MAINT INFO prompt on the left, center, or right CDU gives access to the maintenance pages on the multifunction display (MFD). You use the display select panel and the display switching panels to show the maintenance page display selection menu on the lower center, left inboard, or right inboard display units.
　
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