737 MAX Flight Crew Operations Manual
Engines, APU
Chapter 7
Engine System Description
Section 20
MN-FLT-OH-201
7.20.1
20 Engine System Description
Engine System Description
File Highlight
Introduction
The airplane is powered by two LEAP-1B 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. 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 main panel 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 Captain’s inboard DU. The primary engine
indications can also be manually selected to the First Officer’s inboard DU using
ENG TFR button on the Engine Display Control Panel. If there is a failure on the
Captain’s or First Officer’s DU, the display automatically moves to the opposite
DU.
Secondary Engine Indications
N2, fuel flow, oil pressure, oil temperature, oil quantity, and engine vibration are
the secondary engine indications. The secondary engine indications, except for
fuel flow, are manually selected to either the Captain’s or First Officer’s inboard
DU using the ENG switch on the Engine Display Control Panel. Fuel flow is
displayed full time on the selected inboard display unit below the primary engine
indications.
The secondary engine indications are automatically displayed when:
• the displays initially receive electrical power
• in flight when an Engine Start Lever is moved to CUTOFF
March 1, 2021
