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The ITT and ignition window provides current
status of ITT and engine ignition systems (Figure
7-23). It is powered by normal or emergency DC
power, and is always visible and operating when
any DC power is active in the aircraft. All ITT
and ignition window indications remain valid
when the aircraft is on emergency DC power.
ITT Display
The ITT°C window appears on the top of the
right column of the normal EICAS display, or
below the N1% window on the EICAS reversionary
display. For each engine, it indicates
current ITT, which provides an indication of
interstage turbine temperature. Maximum allowable
(red line) ITT and abnormal high ITT
ranges are calculated by FADEC and displayed
as a red line and a short amber band, respectively,
on each scale.
The ITT scale is calibrated in degrees Celsius
(°C). A white tape and pointer moves along
the outboard side of each scale. Digits appear
at the bottom of the scale to indicate current
ITT during engine start or if ITT values are
under 200.
Ignition (IGN) Display
The green IGN letters appear on the top of an
engine ITT scale when one or both igniters are
energized in that engine (Figure 7-23).
N2% WINDOW
The N2% window indicates the rotation speed
of the N2 spool in percent of maximum N2 rpm
(as determined by the FADEC) (Figure 7-24).
It is a key indication of engine condition. The
window appears immediately below the ITT
and ignition window, whether in the EICAS
normal display or reversionary display. The
digit colors are:
• White during engine start
• Green in acceptable range
• Red when outside acceptable range
The N2% window is powered by normal or
emergency DC power. It is always visible and
GEAR THROTTLE
STATUS POSITION BUG
DOWN ANY TO PWR
UP CRU DETENT CRU PWR
UP CLB DETENT CLB PWR
UP TO DETENT TO PWR
UP BETWEEN NEXT HIGHER
DETENTS DETENT PWR
Table 7-1. TARGET N1 BUG
IGN IGN
ITT RED LINE
ITT AMBER BAND
ITT (ANALOG)
ITT (DIGITAL)
Figure 7-23. ITT and Ignition Window
Figure 7-24. N2% Window
operating when any DC power is active in the
aircraft. All N2% window indications remain
valid when the aircraft is using emergency
DC power.
OIL PRESSURE (PSI) AND
TEMPERATURE (°C)
INDICATIONS
The OIL window appears immediately below the
N1% window on the normal EICAS display
(Figure 7-25), or immediately below the N2%
window on the reversionary display (Figure 7-
26). The OIL window is powered by normal
DC power. However, when the aircraft is using
emergency DC power, only the oil temperature
(°C) indication for the left engine remains valid.
Oil Pressure (psi)
In the normal EICAS display, oil pressure (in
psi) for each engine is displayed by pointers on
the corresponding sides of twin vertical analog
scales (and by pointers and digits when at the
end of the scale). The scales have color bands
indicating normal (green), abnormal (yellow),
and unsafe (red) ranges. The analog scale bands
for the left and right engine are separate because
the low oil pressure caution region and the red
line limit change as a function of N2 speed. The
pointers are the same color as the band to which
they are pointing. The digits display at the bottom
of the oil pressure scales in the same color
as the pointer, but only when the pointer is outside
the green range. In EICAS reversionary
mode, only the color-coded digits appear, but
they appear at all pressures.
Oil Temperature (°C)
In normal EICAS display, oil temperature (degrees
celsius) for each engine is displayed by
pointers on the corresponding sides of a single
vertical analog scale. The scale has color
bands indicating normal (green), abnormal
(yellow), and unsafe (red) ranges. The pointers
are the same color as the band to which they
are pointing. Digits display at the bottom of
the oil temperature scale in the same color as
the pointer, but only when the pointer is outside
the green range. In EICAS reversionary
mode, only the color-coded digits appear, but
they appear at all temperatures.
CAS MESSAGES
CAS messages about powerplant conditions
normally are followed by the letters “L” or “R”
(left or right powerplant). When the same message
applies to both powerplants, the message
is followed by “L-R.” Powerplant CAS messages
include (Figure 7-27):
• Red OIL PRESS LO L-R message
• Amber ENG CTRL SYS L-R message
　
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