From: firstname.lastname@example.org (DAVID ALLARD) Organization: Pilots' Bulletin Board System , Auckland, New Zealand Date: 03 Nov 95 04:23:15 References: 1 Followups: 1
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-> Does anyone out there have any information regarding the amount of -> cockpit noise there is in present day airliners such as -> B747-100/200/300s, 747-400s and any other Boeing airliner information -> you might have. -> I'm looking for information that a layman can understand. Any help or -> information you might have is most appreciated! Having flown some of the above I can tell you that the 747- cockpit is noisier than the B767 and DC10 shaped cockpit areas. This is due to a number of factors. 1. The crew escape hatch is a source of extra noise even though it has a modicum of soundproofing over it. 2.The shape of the 747 cockpit "bulge" results in high mach numbers in that region and greater airflow noise. A number of 747 crew I knew wore earplugs to reduce the affect of the noise levels. Regards, David A.