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THIS IS AN UNCONTROLLED DOCUMENT.
THIS ELECTRONIC DOCUMENT MAY HAVE BEEN SUPERCEDED.
THE MOST CURRENT DOCUMENT INFORMATION IS AVAILABLE
FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA JANUARY 2003
BLEED SYSTEM
An acceleration bleed air system is incorporated in the compressor assembly. The
system allows a portion of the compressed air to escape during the start/acceleration
cycle to prevent stalls, power surges, and to assure rapid response to engine power
demands. The system consists of a
pneumatically operated bleed valve, and an inducer
bleed assembly. As NG increases, the bleed valve gradually closes to reserve air for
engine operation. The inducer bleed serves a similar function to enhance compressor
efficiency when NG is above 96 %.
Four ports along the diffuser scroll are provided to supply bleed air.
One provides air
to the engine fuel system, a second is for to the anti-icing system, and the remaining
two are available as bleed air sources to power airframe systems (optional
environmental control system or customized bleed air heater).
BLEED AIR SOURCES
INDUCER
BLEED PORT
NO. 1 BRG. OIL IN
ACCELERATION
BLEED VALVE
ANTI-ICING AIR NO. 1 BRG. OIL OUT
•EXAMPLE PHOTO•
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