2. I. (3) (c) EICAS DU Reversionary Modes
In the event that the ENGINE
DU fails, the compacted EICAS
format (paragraph 2.H.) is selected for display on the CAS DU
as shown in Figure 252.
This is achieved by selecting the
EICAS
DU REV switches to the BOT CMPT position.
In the event that the CAS DU fails, the compacted EICAS format
(paragraph 2.H.) is displayed on the ENGINE
DU as shown in
Figure 253. This is achieved by selecting the EICAS
DU REV
switches to the TOP CMPT position.
(4) Symbol Generator Reversionary Modes
(a) Symbol Generator 1 (Pilot’s Normal) Failure - As previously
noted, a failure of SG No. 1 would be shown in one of the
following manners:
● Red “X” on the pilot’s PFD
. Red ‘lX”on the
pilot’s ND
. Red “X” on both the pilot’s PFD and
ND
The reversionary mode for this failure is to select the pilot
SG reversionary knob from the NORM to the ALT position. The SG
driving the EICAS at that moment, normally SG No. 3, would then
drive the pilot’s PFD and ND as well as the EICAS displays. If
SG No. 3 control was selected to the alternate position prior
to the SG No. 1 failure, then SG No. 2 would be in use by all
six DUS and a multiple SG failure condition would exist (refer
to paragraph 2.1.(4)(d)).
(b) Symbol Generator 2 (Copilot’s Normal) Failure - A failure of SG
No. 2 would be shown in one of the following manners:
. Red “X” on the copilot’s PFD
. Red “X” on the
copilot’s ND
c Red “X” on both the copilot’s PFD and ND
The reversionary mode for this failure is to select the copilot
SG reversionary knob from the NORM to the ALT position. The SG
driving the EICAS at that moment, normally SG No. 3, would then
drive the copilot’s PFD and ND as well as the EICAS displays.
If SG No. 3
control was selected to the alternate position
prior to the SG No. 2 failure, then SG No. 1 would be in use by
all six
DUS and a multiple SG failure condition would exist
(refer to paragraph 2.1.(4)(d)). For this condition, the
initial SG No. 2 failure mode indication would show the red “X”
on the EICAS display(s) as well as the indications listed
above.
22-14-00
Page 298.32
Aug 15/91
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