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FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA
JANUARY 2003
The particle separator has a tested efficiency of 85% by weight for standard size AC
coarse particles (27 micron nominal). Due to the inertial (centrifugal) action of the tubes,
the separator is more efficient for particles larger than 27 microns, and less efficient
for particles which are smaller. Other debris such as grass or leaves which are too
large to enter the tubes are stopped at the face of the separator. However, the numerous
filter elements are placed so that there will be sufficient air flow by-passing the blocked
elements for flight to be continued. The purge action of the bleed-air venturis may be
turned off when additional engine power is required. A purge switch for each engine
is located in the overhead console. When purge is off, the separators continue to direct
particles into the scavenge chambers, where they collect until purge is restored. Helicopter
performance charts are provided in the FAA approved Flight Manual Supplement BHT-
430-FMS-11 for operation with purge ON and OFF. The compressor wash system
allows the conduct of regular engine cleaning without removal of the separator assemblies.
The increase in weight with the kit installed is 12.7 kilograms (28 pounds).
Summary of Contents for BELL 430
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