Noise levels Cockpit and Cabin
Thread Starter
Joined: Jan 2008
Posts: 94
Likes: 0
From: Irvine, CA
Noise levels Cockpit and Cabin
Noise levels are a major factor for the stress level created at any work place.
I'm looking for reliable data about noise levels inside of today's A/C during cruise. Let's say measured at the position of the pilot's head and another measurement in the last row of the cabin. Since noise measurements are tricky to compare, because the level is inverted proportionally to the distance to the emission source and also different weighting curves (A, C etc.) are used, it is tricky or impossible to compare even the little published data that is available.
Is there an industry norm out there how SPL measurements must be taken, that the A/C manufacturers have to comply with when publishing noise level data?
Have any of you internal data, that could be of interest here?
Thank you.
I'm looking for reliable data about noise levels inside of today's A/C during cruise. Let's say measured at the position of the pilot's head and another measurement in the last row of the cabin. Since noise measurements are tricky to compare, because the level is inverted proportionally to the distance to the emission source and also different weighting curves (A, C etc.) are used, it is tricky or impossible to compare even the little published data that is available.
Is there an industry norm out there how SPL measurements must be taken, that the A/C manufacturers have to comply with when publishing noise level data?
Have any of you internal data, that could be of interest here?
Thank you.
Last edited by Interflug; 25th May 2008 at 07:36.
Joined: Jan 2007
Posts: 105
Likes: 0
From: Queensland, Australia
Well, funnily enough....
By profession I was an audio engineer. Most normally, when considering the risk and nuisance of sound, the "A" weighting curve is the one quoted because it most closely mirrors the response of the human ear.
Bored on my last long haul flight, I dragged my B&K meter out of my hand luggage and did a measurement in the cabin which worked out to be 79dB(SPL) A weighted. This was 5 seats from the rear of an Air New Zealand 744, with the measurement taken during a "sleep" phase of the flight so there was little or no passenger noise in that reading. If you want to get really precise, I was seated in an inboard aisle seat so away for the exterior "skin" of the aircraft.
Hope this helps. If it wasn't for the rules on flight deck visits, I'd offer to do the "pilots head" measurement for you in return for a spell in the jump seat! Ah well, thanks Osama for spoiling my aviation interest hobby.
Bob
By profession I was an audio engineer. Most normally, when considering the risk and nuisance of sound, the "A" weighting curve is the one quoted because it most closely mirrors the response of the human ear.
Bored on my last long haul flight, I dragged my B&K meter out of my hand luggage and did a measurement in the cabin which worked out to be 79dB(SPL) A weighted. This was 5 seats from the rear of an Air New Zealand 744, with the measurement taken during a "sleep" phase of the flight so there was little or no passenger noise in that reading. If you want to get really precise, I was seated in an inboard aisle seat so away for the exterior "skin" of the aircraft.
Hope this helps. If it wasn't for the rules on flight deck visits, I'd offer to do the "pilots head" measurement for you in return for a spell in the jump seat! Ah well, thanks Osama for spoiling my aviation interest hobby.
Bob
Thread Starter
Joined: Jan 2008
Posts: 94
Likes: 0
From: Irvine, CA
Thanks Bobbsy. EU-Law requires the employer to supply noise protection equipment to the employee when the average SPL is >80 dB (A) over 8 hours. Over >85 dB (A) the use of such equipment is mandatory. Now for a 12 hour intercontinental flight, that levels would be even lower. Just imagine all the flight crews wearing those big noise protection headsets. 
Interesting to know, that noise levels present in today's long range airplanes are considered to cause at least temporary hearing impairments.
Interesting to know, that noise levels present in today's long range airplanes are considered to cause at least temporary hearing impairments.
Joined: May 2004
Posts: 100
Likes: 1
From: australia
The airline that I work for has recently installed noise-cancelling headsets on their 767 fleet after years of complaints based around squealing / noisy No. 1 windows.
I am curious... does your airline have noise cancelling headsets on their 767 fleet?
I am curious... does your airline have noise cancelling headsets on their 767 fleet?
Joined: Apr 2005
Posts: 455
Likes: 0
From: Euroville
EU-Law requires the employer to supply noise protection equipment to the employee when the average SPL is >80 dB (A) over 8 hours. Over >85 dB (A) the use of such equipment is mandatory.
