rootsair
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Noisy Flaps

Tue Feb 08, 2005 2:49 am

Last year I took SN brussels from GVA to Marseille on an AvroJet and I was surprised at how noisy the flaps were . When they were moving before landing in marseille, I sleeping and freaked out with the noise. Is it me or are ARJ's flaps that noisy
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pilotaydin
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RE: Noisy Flaps

Tue Feb 08, 2005 2:51 am

yeah the Avrojets have this aerodynamic flow for flaps 18, that cause this issue, im not sure if it's flaps 18 or 11 now....rats...well somewhere in the acute angle range....

it freaks out first time flyers, i know this very well from TK Rj70 and 100s
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ArmitageShanks
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RE: Noisy Flaps

Tue Feb 08, 2005 3:55 am

Some spots on the 767 can be noisy on landing when the flaps are extended.
 
SlamClick
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RE: Noisy Flaps

Tue Feb 08, 2005 4:23 am

The BAe or Avro does have that very noisy band. It actually occurs only (or loudest) when in transit. IIRC it was around 12-16 degrees on their way to or from the first setting which was 18.

It was programmed into our simulator and sitting in the briefing room near the end of the session before you, you could actually hear it. It was then time to hit the bathroom before getting into the box.

Once evening my wife and I were standing in our driveway when we lived near an airport. We could hear a jet idling by overhead but when we heard that sound my wife laughed out loud and said: "I don't even have to look up!" I was flying the "quadrophonic leaf blower" at that time and she knew the sound.
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2H4
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RE: Noisy Flaps

Tue Feb 08, 2005 12:01 pm

I always liked the name "Quadrapuff" for the Avro/146.


2H4
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SlamClick
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RE: Noisy Flaps

Tue Feb 08, 2005 12:28 pm

Or, because of the howling flaps - The Hound of Hatfield.

Swineliner.

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AJ
Posts: 2295
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RE: Noisy Flaps

Tue Feb 08, 2005 4:19 pm

Ansett and Southern Flight Attendants used to give a PA regarding the noise made while the flaps were in transit so passengers would not get alarmed!

On the 767 the howling noise sometimes made during flap movement was traced to loose or missing seals in the inboard leading edge slat.
 
troubleshooter
Posts: 420
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RE: Noisy Flaps

Tue Feb 08, 2005 6:21 pm

I was once told that this noise on the "vierzylinder" (146/RJ) is produced by the slot between the flap panel and the fuselage. They introduced a shutter for the # 1 flap track on later 146 versions and on all RJs. But this did not solve the problem. I love that sound. That makes the ship more "personal".
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HAWK21M
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RE: Noisy Flaps

Tue Feb 08, 2005 7:37 pm

Any pics of this Flap panel near Fuselage.
regds
MEL
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TWAMD-80
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RE: Noisy Flaps

Wed Feb 09, 2005 11:27 am

When I flew on the 146 I noticed that it had particularly noisy flaps. Another jet that I found to have noisy flaps is the 737-300,400,500 series. When the flaps extend, you can hear the motor.

TW
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bri2k1
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RE: Noisy Flaps

Wed Feb 09, 2005 11:37 am

I just took UA from IAH to DEN today and I agree! We were on a 737-500. During the landing roll, with the ground spoilers still deployed, the flaps began to retract. From seat 17A, I was able to see the long green-colored bar beneath the spoilers rotate (noisily) to retract the flaps. It was very loud without the spoliers stowed. Howver, I also flew CO 737-800 and 900 craft over the weekend, and I didn't find them to be any less noisy.
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Airgypsy
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Joined: Tue Nov 23, 1999 11:02 am

RE: Noisy Flaps

Wed Feb 09, 2005 12:04 pm

The Howl of Hatfield is caused by the same thing that makes a blade of grass hum between your fingers.
The spoilers have a seal strip that is pressed down tight against the flap when it is retracted and then opens when the flap extends 0-18 degrees. A very large reed instrument. The seal strips are replaced for cracking because of this dynamic. Been there, done that on the -146.
 
airplay
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RE: Noisy Flaps

Wed Feb 09, 2005 12:28 pm

The first time I heard the howl on a BAE-146, the flight attendant warned us on the pre-landing briefing. I notice they don't do it anymore.

It was kind of an odd sound.

Recently, on a flight on an IAI Westwind I really noticed a great deal of noise when land flap was selected. There is a really loud groan followed by lots of air noise.
 
CaptOveur
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RE: Noisy Flaps

Wed Feb 09, 2005 12:45 pm

When the flaps extend, you can hear the motor.

I like that sound, it means they are working.
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HAWK21M
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RE: Noisy Flaps

Wed Feb 09, 2005 2:46 pm

Another jet that I found to have noisy flaps is the 737-300,400,500 series. When the flaps extend, you can hear the motor

Thats the Flap Drive unit operating the Torque tube located below in the MWW.

regds
MEL
I may not win often, but I damn well never lose!!! ;)

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