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PRIMARY DISPLAY SYSTEM -EICAS LIMITED MODE RECOVERY
General
After the EICAS display automatically switches, the selection of EICAS on either inboard display selector causes the lower center DU to show the secondary engine format. The EICAS display shows on the inboard DU.
The EICAS display shows on both inboard DUs when the inboard display selectors are in the EICAS position.
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PRIMARY DISPLAY SYSTEM -MULTIPLE DISPLAY FORMATS
General
The primary display system has the capability to show multiple formats at the same time. To do this, the DSP works with the inboard display selectors on the display switching panels. The system has the capability to show any combination of display formats.
As an example, to show the AIR synoptic on the F/O’s inboard DU, do this:
*
Put the right inboard display selector in the MFD position
*
Select R INBD on the DSP
*
Select AIR on the DSP.
To show the electrical synoptic on the captain’s inboard DU, do this:
*
Put the left inboard display selector in the MFD position
*
Select L INBD on the DSP
*
Select ELEC on the DSP.
The inboard DUs return to the ND display when you select the inboard display selector on the Captain’s Display Switching Panel to the ND position or when you select the NAV switch on the DSP.
The inboard DU also returns to the ND display when you select the NAV switch or re-select the Synoptic switch on the DSP if the DU is showing the synoptic page.
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PRIMARY DISPLAY SYSTEM -NAVIGATION DISPLAY PRIORITIES
Center Lower DU
Select the NAV switch and the LWR CRT switch on the DSP to cause an ND display to show on the lower center DU.
If only one ND (capt or F/O) shows on an inboard DU, the other ND (capt or F/O) shows on the lower center DU.
If both the captain’s and the F/O’s inboard DUs show the ND display or neither show the ND display, the lower center DU shows the captain’s ND.
Inboard DU
If the left or right inboard display selector on the display switching panels is in the MFD position and the NAV switch on the DSP is set, then the left or right inboard DU will show the associated captain’s or first officer’s ND display. If the inboard DU is showing a synoptic page, re-selecting the synoptic switch on the DSP will also turn the DU to the ND display.
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PRIMARY DISPLAY SYSTEM -SECONDARY ENGINE EXCEEDANCE
General
The EICAS display format and MFD show different formats when a secondary exceedance latches or an exceedance clear occurs. This occurs during normal and limited operation.
Secondary Engine Exceedance Latches
When a secondary engine exceedance latches in memory, the upper center DU and lower center DU change formats. The new formats depend on the formats that show before the exceedance occurs.
During normal operation one of these will occur:
*
If the lower center DU is blank, then it shows the secondary engine format and the upper center DU shows the EICAS display format.
*
If the lower center DU shows the secondary engine format, it remains the same and the upper center DU shows the EICAS display format.
*
If the lower center DU shows a maintenance page while the airplane is on the ground, it remains the same and the upper center DU shows the compacted engine format.
*
If the lower center DU shows a status page format, a synoptic, flight deck communication function format, checklist format or a navigation display, it remains the same and the upper center DU shows the compacted engine format.
During limited operation, if the upper center DU is blank and the lower center DU shows the EICAS display format, the lower center DU shows the compacted engine format.
Secondary Engine Exceedance Clears
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