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Reply #9: Filters and sand [View All]

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Liberal In Texas Donating Member (1000+ posts) Send PM | Profile | Ignore Fri Jan-28-05 12:40 PM
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9. Filters and sand
Modern helicopters can be equipped with filtration systems for dusty/sandy environments, which helps, but it does not appear to be a perfect solution:

The Aerospace Filtration system includes a single filter design optimized for both hover and forward flight, improving engine performance over the entire airspeed envelope in comparison to the use of inlet particle separators. It is also designed to filter out more than 99 percent of dust and sand, giving more engine temperature margins, thus more load carrying capacity, according to the manufacturer. Scimone said the company has delivery more than 3,500 filters to military and civilian customers. They are particularly showing great success on U.S. Army OH-58Ds and AH/MH-6Js flying in Iraq, filtering out the extra-fine desert sand, allowing turbine blades to make it to TBO rather than having to be removed after only a few hours.
http://www.aviationtoday.com/cgi/rw/show_mag.cgi?pub=rw...

Also, sandy environments require engine cleaning more often. It's not a perfect system.

CH-53s operate with an engine air particle separator to filter sand, but the device can't keep up with the large amounts ingested in operations here(Iraq). Technicians have begun using a pressure washer and water to clean the engines after each mission. Some Marine Corps officials have voiced frustration that engine maker General Electric over the past decade hasn't devised a better system to deal with the sand.
http://www.acq.osd.mil/log/logistics_materiel_readiness... /
aviation_week_space_tech.pdf
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