Mr. Toad,
You ask, "What will it prove?"
It will prove that unlike you, I read the question that sparked the thread, which is (try reading it now, if you have a moment!) " Does anyone have any cockpit noise data from the C model at hand."
I do disagree with the point of the thread, as I feel that the noise in a cockpit can be fully reduced with the right headset and earplug combination.
Here is the capability of a David Clark (-24dB rating, -35 in the high freq damage range):
http://www.davidclark.com/HeadsetPgs/h10-20.htm
Typical earplugs add 15 to 25 dBA to that, so available protection is about -40 dBA.
Here are OSHA noise regs, where protection is required at about 90dBA:
http://www.osha.gov/pls/oshaweb/owad...able=STANDARDS
Note that the requirement is that protection is required at 85dBA.
I have no info to say that aircraft operators are exempt from OSHA protection (in the States, of course!)
With -24dB reduction, the cockpit could be at 109 to 114 dBA and still be acceptable.
Here is a table of noise standards worldwide:
http://staff.washington.edu/rneitzel/Standards.htm
Here is the Canadian standard (85 dBA) Note that the phrase "Statutes or regulations covered by other jurisdictions apply to aircraft operations" is inserted in the Occupational Health regs for Aircraft Operatons (Part 29):
http://www.worksafebc.com/law_and_po...rt_7_clean.pdf