PUREair Protection Against Sand and Dust

In everyday flying conditions, when the air is drawn into the engine, particles of sand and dust are carried along with it. The sand and dust can cause significant, long term damage to engine components.


Sand and dust ingestion causes compressor erosion, turbine blade glazing, and component wear, which can lead to vibration and component fatigue.

Other effects of dust ingestion include compressor fouling, accumulation of particles in the combustion chamber, and blockage of cooling passages.

Just a few kilos of dust particles above 10 microns in size (roughly the dimensions of a human blood cell) are sufficient to degrade engine performance and impose engine removal well before the scheduled Time Between Overhaul (TBO). Depending on the sand and dust concentration levels, these phenomena can sometimes appear as hundred hours.

Other effects of dust ingestion include compressor fouling, accumulation of particles in the combustion chamber, blockage of cooling passages, and turbine glazing.

The Solution

The PUREair system has an excellent sand and dust separation efficiency (up to 98%). With Pall’s latest designs, very few erosive particles are found downstream of the PUREair system. This means that with dusty conditions a PUREair protected engine will achieve a much longer service life, closer to the time TBO without any of the above mentioned detrimental effects.

The PUREair solution will provide this exceptional protection continuously, without the maintenance and spares other systems demand.


If an engine normally achieves about 1,000 hours before suffering from erosion, with the PUREair system it should achieve TBO in ”like new“ condition in terms of erosion, again with no supplementary maintenance.
The Ultimate in Helicopter Engine Protection
PUREair - The Ultimate in Helicopter Engine Protection
Why PUREair?
Why Choose PUREair?
PUREair systems offers the ultimate in helicopter engine protection
More than fifty different designs have been certified
How Does It Work?
How Does it Work?
Pall PUREair system training program
Design and Testing
Design and Testing
Pall's design and engineering expertise
PUREair Services
PUREair - Repairs and Support Services
Maintenance guidelines and global contact details