787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Engines, APU Chapter 7
Engine System Description Section 20
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 7.20.1
7.20 Engines, APU-Engine System Description
Engines , APU20 Engine System DescriptionEngine S ystem Descri ption
Introduction
[Option – GEnx-1B64 engines]
The airplane is powered by two General Electric GEnx-1B64 engines. The
engines are rated at 63,800 pounds of takeoff thrust each.
[Option – RR Trent 1000A engines]
The airplane is powered by two Rolls Royce Trent 1000A engines. The engines
are rated at 63,800 pounds of takeoff thrust each.
[Option – GE engines]
The engine is a two rotor axial flow turbofan engine of high compression and
bypass ratio. The N1 rotor consists of a fan, a low pressure compressor section,
and low pressure turbine section on a common shaft. The N2 rotor consists of a
high pressure compressor section and a high pressure turbine section on a common
shaft. The N1 and N2 rotors are mechanically independent. The engine accessory
gearbox is driven by the high speed N2 engine shaft.
[Option – RR engines]
The engines are three-rotor axial flow turbofans of high compression and bypass
ratio. The N1 rotor consists of the fan and a low pressure turbine section on a
common shaft. The N2 rotor consists of an intermediate pressure compressor
section and an intermediate pressure turbine section on a common shaft. The N3
rotor consists of a high pressure compressor section and a high pressure turbine
section on a common shaft. The N1, N2, and N3 rotors are mechanically
independent from each other. The N2 rotor drives the engine accessory gearbox.
Each engine is controlled by an electronic engine controller (EEC). The EECs
monitor autothrottle and flight crew inputs through the thrust levers to
automatically control the engines.
Each engine has individual flight deck controls. Thrust is set by positioning the
thrust levers. The thrust levers are positioned automatically by the autothrottle
system or manually by the flight crew. (Refer to Autothrottle System
in Chapter
4, Section 20, for additional information.)
Engine indications are displayed on the engine indication and crew alerting
system (EICAS) display.
Engine Intermix
[Option – GE engines]
Both engines are set to operate at the same thrust rating. Replacement engine
thrust rating is increased or decreased to match the thrust rating of the installed
engine configuration. An EGT amber band (maximum continuous limit)
difference between engines may be indicated, but these indications are normal.
June 16, 2008
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