PDA

View Full Version : Cockpit noise levels


CH146
18th Sep 2004, 11:50
Is anyone in a position to provide a noise fiqure, in dB for a classic B737 flight deck. Google and PPrune search etc provide lots of generic info on acceptable and non-acceptable levels, but I can not find anything specific to aircraft types.

Trying to do a bit of research prior to buying a headset and any info would be helpful.

IRRenewal
18th Sep 2004, 14:00
Noise measurement in the cockpits of various aircraft using a hand held Radio Shack Digital-display Sound-level Meter produced interesting results. Boeing 737-300/400 aircraft registered 84-86 dBA in normal cruise flight at FL 270-290 (27000-29000 feet).

I searched google on

"noise level" 737 cockpit

and the above quote was taken from the first hit from this (http://mywebpages.comcast.net/rmnelson2/Direct_effects_of_noise.html) website.

flying_elvis
18th Sep 2004, 16:51
If you get one of those fancy db meters you'll notice that the noise level goes up exponentially above 300 knots on a 737-800.

The same goes for approaching 82 mach.

This is not a drawback IMO. I like an airplane that talks to you! 757 767 don't really talk to you at those speeds, so an overspeed can really sneak up on you with little warning.

747FOCAL
18th Sep 2004, 17:25
There are a lot of things you might be more concerned about that you can hear that don't have a horn to warn you about like overspeed.

Boeing is working on a fix that I hear puts the flight deck noise around 72 dBa. ;)

MasterBates
18th Sep 2004, 21:45
The 757 is very well designed in regard to skin (wind) noise, but to make up for low levels of that kind of noise they invented the aircondition ducts from hell (almost as noisy as the average US home a/c system). There must have been a deaf man designing this apparatus! Very sad.
:sad:

bafanguy
19th Sep 2004, 21:23
Once you lose 50% of your hearing, cockpit noise won't be a problem for you any more. What ???

cwatters
22nd Sep 2004, 18:36
Boeing 737-300/400 aircraft registered 84-86 dBA in normal cruise flight

UK Health and Safety rules (http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1074441952)suggest a limit of 85. In australia they have a similar limit but I think they say you are entitled to compensation if your hearing is reduced by 6% due to work place noise.

Max Angle
22nd Sep 2004, 21:18
I like an airplane that talks to you! 757 767 don't really talk to you at those speeds, so an overspeed can really sneak up on you with little warning. Thats what the instruments and the overspeed horns are for. Most modern flightdecks are very noisy, one aspect of a/c design that has gone backwards. DC9 was almost silent even at high speed, very nice. The Airbus is noisy even when you are sitting on the ground, it's only when you turn it off that realise how much damm noise it makes.

djpil
23rd Sep 2004, 12:01
From tests I did with a DoT observer in the open front cockpit of an early model Pitts S-2A in 1980 - 126 dB in a climb, peak of 130 in aerobatics.