I’m finding that by the end of a second trip 7-8 hours, I have the ICS turned up to MAX and still have to ask for repeats. This is the loudest helo I have ever been in. Much louder than the SK or even the Chinook! I’m sure that the cockpit proximity to the MRB tips and the 4-blade design are doing it. Every bit of glass and plexi in the front office is moving like a drum skin. The windshield must be moving in and out 0.5 cm with the passage of each blade (Roughly 16 Hz). It is an astounding acoustic assault. As I recall from my HFE (Human Factors In Engineering), the danger range for Whole Body Vibrations is in the 1-80 Hz range. That puts the S-92 Cockpit environment in the first quarter (linear) or middle of that range (logarithmically). I suspect that the sound pressure levels and acceleration limits are at or above the OSH safety standards… But what can you do?
– Rotorhead124
Link : http://www.pprune.org/rotorheads/362452-hearing-problems-flying-s92-2.html
Where do these vibrations come from?
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February 12, 2011 at 10:12 am