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of the left or right inboard display unit. See Chapter 10, Flight Instruments,
Displays, Section 20, for a description of other display configurations
Primary Engine Indications
TPR, N1, and EGT are the primary engine indications. The primary engine
indications are displayed full-time on the EICAS display.
787 Flight Crew Operations Manual
Engines, APU -
Engine System Description
7.20.2 Boeing Proprietary
Secondary Engine Indications
N2, N3, fuel flow, oil pressure, oil temperature, oil quantity, and engine vibration
are secondary engine indications. Secondary engine indications are displayed on
EICAS below the primary engine indications. The secondary engine indications
can be displayed by pushing the secondary engine display switch (the ENG switch
on the display select panel). The secondary engine indications are automatically
displayed when:
• the displays initially receive electrical power
• a FUEL CONTROL switch is moved to CUTOFF in flight
• an engine fire switch is pulled in flight
• a secondary engine parameter is exceeded
• engine N2 RPM is below idle in flight
• a start switch is in START position.
When the secondary engine parameters are automatically displayed (on the
EICAS display) due to any of the above conditions, they cannot be cleared until
the condition is no longer present. Once the condition is no longer present, the
secondary engine parameters can be cleared by pushing the secondary engine
display switch.
Normal Display Format
Primary engine indications and the N2 indications are both digital readouts and
round dial/moving pointer indications. The digital readouts display numerical
values while the moving pointers indicate relative value.
Oil pressure, oil temperature, and vibration indications are both digital readouts
and vertical indication/moving pointers. N3, Fuel flow and oil quantity are digital
readouts only. All digital readouts are enclosed by boxes. The dial and vertical
indications display the normal operating range, caution range, and operating limits
(as applicable).
Normal operating range is displayed on a dial or vertical indication in white.
The oil temperature and oil pressure vertical indication has caution ranges
displayed by amber bands. If oil temperature reaches the caution range, the digital
readout, digital readout box, and pointer all change color to amber.
N1, N2, EGT, oil pressure, and oil temperature indications have operating limits
indicated by red lines. If one of these indications reaches the red line, the digital
readout, box, and pointer change color to red for that indication.
787 Flight Crew Operations Manual
Engines, APU -
Engine System Description
Boeing Proprietary 7.20.3
The EGT indication has a maximum continuous limit represented by an amber
band. The maximum continuous limit does not apply during takeoff or go–around.
If EGT reaches the maximum continuous limit, the digital indication, box, pointer,
and dial all change color to amber. EGT indications are inhibited from changing
to amber during takeoff or go–around for five minutes. The EGT indication is
often in the amber band during takeoff; this is acceptable. The inhibit is extended
to ten minutes for single–engine operation. The EGT indication has a maximum
takeoff limit displayed by a red line. If EGT reaches the maximum takeoff limit,
the digital indication, box, pointer and dial, all change color to red.
The EGT indication has a maximum continuous limit represented by an amber
band. The maximum continuous limit does not apply during takeoff or go–around.
If EGT reaches the maximum continuous limit, the digital indication, box, pointer,
and dial all change color to amber. EGT indications are inhibited from changing
to amber during takeoff or go–around for ten minutes. The EGT indication is often
in the amber band during takeoff; this is acceptable. The EGT indication has a
maximum takeoff limit displayed by a red line. If EGT reaches the maximum
takeoff limit, the digital indication, box, pointer and dial, all change color to red.
If an N1, N2, N3 or EGT red line is exceeded, the box enclosing the digital readout
remains red after the exceeded limit returns to the normal range. The red box color
can be canceled to white or recalled to red by pushing the cancel/recall switch on
the display select panel. An indication changes color back to white when it returns
to the normal operating range.
For low oil quantity, the oil quantity digital readout changes to black text on a
white background. The white text LO is displayed adjacent to the readout.
For high engine vibration, the vibration digital readout changes to black text on a
　
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