*
Center AFDC if right AFDC is not valid

*
Left AFDC if right and center AFDCs are not valid.

This is the MCP priority for both PFDs:
*
The A microprocessor if valid

*
The B microprocessor if the A microprocessor is not valid.

EFFECTIVITY BEJ ALL
AFDS Modes
The top of the PFD shows the AFDS modes of operation. This is the flight mode annunciator (FMA). Active and arm pitch and roll modes show.
The failure of sensor data necessary for the active pitch or roll mode causes a yellow bar to show through the mode on the FMA. This bar indicates a mode failure. An arm mode will not show the mode fail bar.
Flight Director Commands
Flight director commands show on the PFD as an integrated cue symbol. A roll or pitch mode failure causes the flight director symbol to go out of view.
When the AIMS does not receive any valid F/D data from the AFDCs and either of the F/D switches is on, a F/D failure flag shows on the PFD.
AFDS Engage and Autoland Status Annunciation
The AIMS shows this AFDS status:
*
FLT DIR -when in flight director only operation

*
A/P -when in autopilot operation

*
LAND 3, LAND 2, or NO AUTOLAND -when in approach and below 1500 feet radio altitude

*
Test -if any AFDC is in test.

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This is the autoland status display priority:
*
NO AUTOLAND

*
LAND 2

*
LAND 3.

MCP Selected Data
The AIMS shows this data from the MCP:
*
Selected speed

*
Selected mach

*
Selected altitude

*
Selected vertical speed

*
Selected flight path angle

*
Selected heading

*
Selected track.

Selected Flight Path Angle
Selected flight path angle (FPA) shows on the PFD when you select FPA on the MCP. The selected FPA is a target for the flight path vector (FPV) symbol, it is not a target for the flight director symbol. If you select FPA on the MCP before you select the FPV on the EFIS control panel, the FPV will show automatically on the PFD.
Navigation Display (ND)
The ND shows the selected track or heading cursors. The AIMS uses the validity of the MCP A and B processors for the priority of the display.
This is the MCP priority for both NDs:
*
A processor

*
B processor.

Barometric Reference Source
The barometric reference source shows which barometric (baro) correction the AFDCs use. An L shows that the AFDCs use the captain baro correction value. An R shows that the AFDCs use the first officer baro correction value. Both PFDs show the same baro reference source.
When there is no autopilot engagement and whe the flight director is selected only, the AFDCs use the captain barometric correction when the left flight director switch is on, and both PFDs show the letter L. If you select the ON position for only the right flight director switch, the AFDCs use the first officer barometric correction and both PFDs show the letter R. If both flight director switches are on, the AFDCs use the captain barometric correction, and both PFDs show the letter L
When you engage the autopilot with the left autopilot engage switch, the AFDCs use the captain baro correction value and both PFDs show the letter L. When you engage the autopilot with the right autopilot engage switch, the AFDCs use the first officer baro correction value and both PFDs show the letter R.
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AFDS -FUNCTIONAL DESCRIPTION -WARNING AND ANNUNCIATIONS -EICAS DISPLAYS

General
The EICAS and MFD displays show messages, warnings, and autoland capability for the autopilot system. The warning electronic units (WEUs) make the master warning lights come on when a warning message shows on the EICAS display. The AIMS makes the master caution lights come on when a caution message shows on the EICAS display.
The AFDCs send data that causes these types of messages to show on the EICAS display and the MFD:
*
Warning on the EICAS display

*
Caution on the EICAS display

*
Advisory on the EICAS display

*
Status on the status display.
　
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