Flt deck Noise - Older A320s
We did some flt deck noise level testing on some of older A320 fins (msn 0050 - 0250 ) as they are consistently noted for significantly higher noise levels than our newer A320s, A319s or A321s. Our Older A320s all measured the same 77 dBA averaged over a 1 hr flt vs 74 dBA on the newer fins. The older aircraft are all configured the same (engs, WGT etc) as the newer ones and it's not a case of them simply being older or we would have seen see a linear relationship between noise and age. That wasn't the case. The older fins are just 3 dbA louder across the board.
Closing off the side vents cuts down the noise as does using one pack only by a few dBA so the immediate suspect is the AC and packs but I don't see any physical explanation there for the difference.
Anybody have any suggestions or experience to relate?
Last edited by nnc0; 7th February 2010 at 18:14.