My old Commander 520 with the geared props and augmentor tubes was notoriously loud. Never set off the audio alarms at SMO, but I did at Long Beach, which has much higher tolerances. This is from an airport that regularly sees old noisy jets and military fighters. I have the letter to prove it. So these noise level measuring things are obviously not very reliable or consistent. Besides, the SMO banned list is it seems purely based on perception, not actual audio levels.
Last edited by AdamFrisch; 14th Oct 2013 at 20:21.