787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Engines, APU -
Engine System Description
Copyright © The Boeing Company. See title page for details.
7.20.4 D615Z003-TBC
[Option – RR engines]
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.
[Option – RR engines]
The maximum TPR limit is indicated by an amber line at the top of the TPR dial.
The TPR indication does not change color when maximum TPR is reached. The
reference/target TPR indication displays the FMS reference or target TPR. The
commanded TPR indication displays the EEC calculated TPR commanded by
thrust lever position.
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 and go-around; 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.
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
white background.
Electronic Engine Control (EEC)
[Option – GE engines]
Each EEC has full authority over engine operation. The EEC uses thrust lever
inputs to automatically control forward and reverse thrust. The EEC has two
control modes: normal and alternate. In both normal and alternate modes, the EEC
uses N1 RPM as the controlling parameter.
[Option – RR engines]
Each EEC has full authority over engine operation. The EEC uses thrust lever
inputs to automatically control forward and reverse thrust. The EEC has two
control modes: normal and alternate. In the normal mode, the EEC uses TPR as
the parameter for setting thrust. In the alternate mode, the EEC uses N1 RPM as
the controlling parameter.
August 14, 2009
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