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GeorgeinBrussels

1st May 2005 19:41

Rj85

Hello. I fairly regularly fly with SN Brussels Airlines (for obvious reasons) and almost always on RJ85s or similar. I have noticed that about two minutes after take-off and a similar time before landing, the aircraft lets out this rather alarming groaning sounds that last perhaps five seconds and I have often wondered what that is.

I have travelled on loads of different Airbuses, Boeings etc., but never one that consistently makes the noise that the RJ85/BAe146 makes.

What love to know what causes this.

Many thanks,

George

Wycombe

1st May 2005 20:05

As far as I know (I'm sure someone who operates the type will correct me if I'm wrong), the noise is caused during flap deployment/ retraction. At a certain point in process, the "howl" is caused by a gap between the inboard flaps and the fuselage.

rekop

1st May 2005 20:40

That is correct. The flap settings are 0, 18, 24, 30, 33. The last apr 5degrees of retraction from flap 18 to flap 0 give this charictaristic sound. The same for the first apr 5degrees when the flaps are selected from flap 0 to flap 18.

GeorgeinBrussels

1st May 2005 20:50

Thanks a lot - I had always wondered.

WHBM	1st May 2005 21:14

All discussed here

http://www.pprune.org/forums/showthr...flap+noise+146

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