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Old 17th Feb 2009, 23:16
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NGPogue
 
Join Date: Dec 2007
Location: USA
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For what it's worth the US Army requires earplugs or CEP's under the flight helmet in the UH-60 because of the noise level. This is based on an occupational exposure to 85 db for 8 hours being considered hazardous. The noise level in the UH-60 is around 102 db. The SPH-4B and HGU-56 helmets reduce that to 90.6 db, and the SPH-4 reduces it to 95.1 db. The SPH-4/foam earplug combination reduces it to 70.4 db. The HGU-56 with CEP's reduces it to 71.1 db, and has the added advantage of making radio and ics easier to hear. Since the S-92 is kind of a cross between a Blackhawk and a CH-3E I would probably wear them were I flying one...
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