News from the hinterlands

NASA ISS On-Orbit Status 18 October 2009


De Winne, Stott, Thirsk & Williams took the periodic O-OHA (On-Orbit
Hearing Assessment) test, a 30-min NASA environmental health systems
examination to assess the efficacy of acoustic countermeasures, using a
special software application on the MEC (Medical Equipment Computer) laptop.
[The O-OHA audiography test involves minimum audibility measurements for
each ear over a wide range of frequencies (0.25-10 kHz) and sound pressure
levels, with the crewmembers using individual-specific Prophonics earphones,
new Bose ANC headsets (delivered on 30P) and the SLM (sound level meter). To
conduct the testing, the experimenter is supported by special EarQ software
on the MEC, featuring an up/down-arrow-operated slider for each test
frequency that the crewmember moves to the lowest sound pressure level at
which the tone can still be heard. The baseline test is required not later
than about Flight Day 14 for each new Expedition and is then generally
performed once per month. Note: There have been temporary hearing deficits
documented on some U.S. and Russian crewmembers, all of which recovered to
pre-mission levels.]
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Peter Davis (22.10.2009 00:24)