AIRPLANE
OPERATIONS
MANUAL
POWERPLANT
DECEMBER 20, 2002
2-10-20
Page
1
Code
01
ENGINE BLEED
Air is bled from the compressor 9
th
stage during engine starting to
assist with accelerating to idle rpm.
There are two different types of compressor acceleration bleed valves
(CABV). The original type used two valves per engine, located
externally on the HP compressor at approximately the 12:00 and 6:00
O’clock positions. The second type is a single valve at 6:00 O’clock
position.
The engine also provides bleed air to the Pressurization and Air
Conditioning system through the Engine Bleed Valve (EBV). Bleed air
for this system is extracted from the 9
th
or 14
th
stages depending on
the request. Refer to section 2-14-05 for more information.
To Next Page
