*** Posted by Rapier ***
I am well aware that you are talking about the SUDDEN appearence of the airnoise around the plane, it's quite common in all passanger planes! Please tell me why are you facinated by this phenomina?

The DC-10 is an OK aircraft but can easily be thrown around by turbulence. The noise inside the aircraft can be caused by many thing's.

One particular instance when I was on a DC-10 happened a couple of years ago now. I noticed this stange noise close to where I was sitting. I called the stuardess and whispered to her ear (not to make the other passagers frightened incase they heard me) about the strange noise. I told her to go and speak with the Captain and see if he noticed any strange values on his cabin pressure reading's. The stuardess came back and said it's probably nothing, so I thought ok. 20 mins later the noise got louder and some other passengers on the plane began noticing the noise like a high wisper at a high frequency. I called the stuardess again and told her to do the same thing as she had done before. She came back and passed a message on from the Captain saying thank you. Apparently the noise was cased to a faulty seal in the airframe and the noise of the engines was amplified. If the pilot stayed on at the same altitude there would have been trouble. He then decended to about 10000 feet and the noise lowered. That's the loudest plane I've been on but I did not remember any distinct noises around the plane caused by drag too much on take off. Infact I think the noise you are refering to may be caused by the flaps in the take off position, after a short while they are retracted.

Rapier

[Check "again,again": I'm writing about the SUDDEN aperance of the airnoise around the plane (caused by the drag)!

Kim]