737 Flight Crew Operations Manual
Engines, APU Chapter 7
Engine System Description Section 20
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 7.20.1
20 Engine System DescriptionEngi ne System De scriptionFile Highlight
Introduction
The airplane is powered by two CFM56–7 engines. The engine is a dual–rotor,
axial–flow turbofan. The N1 rotor consists of a fan, a low–pressure compressor
and a low–pressure turbine. The N2 rotor consists of a high–pressure compressor
and a high–pressure turbine. The N1 and N2 rotors are mechanically independent.
The N2 rotor drives the engine gearboxes. A bleed–air–powered starter motor is
connected to the N2 rotor.
A dual–channel electronic engine control (EEC) regulates each engine. The EEC
monitors autothrottle and flight crew inputs to automatically set engine thrust.
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. The forward thrust levers control forward
thrust from idle to maximum. If the EECs are in the alternate mode, advancing the
thrust levers full forward provides some overboost and should be considered only
during emergency situations when all other available actions have been taken and
terrain contact is imminent. The reverse thrust levers control thrust from reverse
idle to maximum reverse
Engine Indications
Primary and secondary engine indications are provided. Engine indications are
displayed on the center forward panel upper display unit (DU), lower DU or the
Captain’s or First Officer’s inboard DU.
Primary Engine Indications
N1 and EGT are the primary engine indications. The primary engine indications
are normally displayed on the center forward panel upper DU. If that unit fails, the
display automatically moves to the lower DU. The primary engine indications can
also be manually selected to either the Captain’s or First Officer’s inboard DU, or
the lower DU, using the respective display select panel.
Secondary Engine Indications
N2, fuel flow, oil pressure, oil temperature, oil quantity, and engine vibration are
the secondary engine indications. The secondary engine indications are manually
selected to either the Captain’s or First Officer’s inboard DU, or the lower DU,
using the respective display select panel and the ENG switch on the engine display
control panel.
September 26, 2013
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