How Loud is a 737 cockpit? TOO loud!
I carried a db meter around for a couple of months recording levels in the cockpit and cabin of 737, 757, 767, Airbus.
The 737 300/500 average about 84-85db from takeoff roll to idle below 250 kts. The 737/700 is slightly better at 82-83db. The 757/767 are about the same. The Airbus is significantly quieter, less than 80db. The loudest recorded was behind the wing, window seat on a 757 on takeoff roll: 96db
Hearing loss will occur at 85db if exposed to that noise level in excess of one hour. Hearing loss will occur at lower db levels if exposure time is increased. Figure 4-8 hours in a cockpit in a single day - you're going to lose significant hearing over time in any Boeing. CRJs appear to be even louder, and ERJs are the worst according to our customers (UFlyMike).
Wear hearing protection on BOTH ears and do it NOW, even if it's a foam earplug. You'll hear the difference at the end of the day. If you want to save your hearing AND reduce your fatigue and stress level, wear a COMFORTABLE ANR headset and keep the earcups over BOTH ears as much as possible. Again, the difference in how you feel after a day of flying is very noticable.
Here's how our customers have "racked & stacked" the more popular headsets (scale of 1 to 10), for what it's worth:
ANR effectiveness
Bose X: 10
Bose QC2/UFlyMike: 8
Sennheiser 25/45: 7
Telex 750/850: 5
Comfort
Bose QC2/UFlyMike: 10
Sennheiser 25/45: 7
Bose X: 6
Telex 750-850: 5
Ruggedness/Reliability
Bose X: 10
Bose QC2/UFlyMike: 8
Sennheiser 25/45: 6
Telex 750/850: 5
Mike
UFlyMike LLC