POWER PLANT
18-12
For Training Purposes Only
May 03
P I L O T T R A I N I N G G U I D E
Engine Bleed Air System
Description
Engine bleed air is extracted from the 7th, 10th and 14th stages of the engine
compressor and used by the airplane systems below:
•
7th stage: Pressurization of oil seals and the venting of engine sumps in the
lubrication system
•
10th stage: Pneumatic supply to the air conditioning and pressurization systems,
and engine starting
•
14th stage: Pneumatic supply to the engine cowl and wing anti-ice systems, or
thrust reverser systems
Components and Operation
Ducting and check valves are used to direct the flow of bleed air from the engine to the
10th- and 14th-stage bleed air manifolds. The nacelle and pylon ducts are monitored
for bleed air leakage by the engine fire and jet pipe overheat detection systems.
For additional information, refer to Chapter 9 Fire Protection and Chapter 19
Pneumatic System.
