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Unusual Sudden Turbulence  
User currently offlineBeakerLTN From United Kingdom, joined Jul 2009, 292 posts, RR: 0
Posted (4 years 8 months 3 weeks 6 days 16 hours ago) and read 2244 times:

I hope you lot don't mind me posting here, I didn't want to fill up the main forum with my drivell.

A short while back, when approaching SIN in a 319 I expeerienced the most unusual turbulence. As we were turning right onto final (I guess about 2,500ft) We experienced a sudden, properly heavy, thump of turbulence.. it was smooth before and smooth afterwards. Was it possible this was wake turbulence?

I've always been very curious to know, and I'm sure some one here would have plenty of experience of such a thing.

Any answers wouold be greatfully received.


300/319/320/321/330/732/733/734/73G/738/744/772/77W/146/EMB135/EMB145
11 replies: All unread, jump to last
 
User currently offlineGST From United Kingdom, joined Jun 2008, 930 posts, RR: 0
Reply 1, posted (4 years 8 months 3 weeks 6 days 14 hours ago) and read 2237 times:

Dont sweat it, this is a perfect use for the forum.

I am not familear with Changi geography, so this may be a foolish Qiestion. Were you over land or sea at the time? If you were over land then it is quite possible that you flew through a strong thermal. Also possible over water but much less likely.


User currently offlineBeakerLTN From United Kingdom, joined Jul 2009, 292 posts, RR: 0
Reply 2, posted (4 years 8 months 3 weeks 6 days 14 hours ago) and read 2227 times:

Quoting GST (Reply 1):
Were you over land or sea at the time?

We were over sea, turning right to the north-east facing right-hand runway (02R), banking a good 30 degrees at the time.

I've experienced a lot of turbulence in my time, but nothing like this. It was like someone kicked the plane from out nowhere, a sudden 'bang' where you hear and feel the airframe judder rather than a stomach lifting or sinking sudden movement.



[Edited 2009-12-10 06:19:23]


300/319/320/321/330/732/733/734/73G/738/744/772/77W/146/EMB135/EMB145
User currently offlineMandala499 From Indonesia, joined Aug 2001, 6849 posts, RR: 75
Reply 3, posted (4 years 8 months 3 weeks 6 days 13 hours ago) and read 2213 times:



Quoting BeakerLTN (Thread starter):
We experienced a sudden, properly heavy, thump of turbulence.

Spacing in approach in Changi isn't as tight as those in Europe or the US...
I have a few questions... Where were you sitting in relation to the Leading Edge of the wing or overwing exit, and have you flown in the same position on an A319/320 before?

Was it just a thump and vibration, or did you feel the aircraft being thrown about a bit during the thump?

I have a suspicion that it's only a loud sticky landing gear locking mechanism/landing gear door lock mechanism.

I've received all sorts of "sudden violent wind" in other aircraft in the cabin (with discussions with the flight crew afterwards) and never had one with a "sudden, properly heavy, thump of turbulence."... However, having a landing gear unlock with the loudest noise you can imagine which sent babies crying and pax praying, I have...

Mandala499



When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlineBri2k1 From United States of America, joined Dec 2004, 988 posts, RR: 4
Reply 4, posted (4 years 8 months 3 weeks 6 days 13 hours ago) and read 2201 times:

I've felt a similar unusual lateral thump in a 777 on final to NRT more than once. I've been through pretty good turbulence in a 777 and got used to the sensations it produced, and this was decidedly different. I've pretty much convinced myself this was wake turbulence from another heavy jet. Without any real way to prove or disprove anything, I'd be inclined to agree with you.


Position and hold
User currently offlineBeakerLTN From United Kingdom, joined Jul 2009, 292 posts, RR: 0
Reply 5, posted (4 years 8 months 3 weeks 6 days 13 hours ago) and read 2193 times:



Quoting Bri2k1 (Reply 4):
I've pretty much convinced myself this was wake turbulence from another heavy jet. Without any real way to prove or disprove anything, I'd be inclined to agree with you.

This is what I thought, and a similar experience - a unusual lateral thump, sideways, and bit upwards too.

Quoting Mandala499 (Reply 3):
Where were you sitting in relation to the Leading Edge of the wing or overwing exit, and have you flown in the same position on an A319/320 before?

I fly on Easyjet's A319s very regularly. I was sitting just behind the wing, so had a good view of what was going on . I heard flaps and landing gear go out as normal after this on a very normal approach.

Quoting Mandala499 (Reply 3):
Was it just a thump and vibration, or did you feel the aircraft being thrown about a bit during the thump?

It was definately turbulence, rather than a noise or vibration that came from the aircraft. The movement was primarily lateral, and a bit upwards, very sudden and lasting no more than 1 second - like you've flown through some sort of invisible wall. All noises were probably creaking seats/cabin baggage moving etc. .. Weather was clear.



300/319/320/321/330/732/733/734/73G/738/744/772/77W/146/EMB135/EMB145
User currently offlineThrottleHold From South Africa, joined Jul 2006, 657 posts, RR: 1
Reply 6, posted (4 years 8 months 3 weeks 6 days 11 hours ago) and read 2167 times:

Sounds like classic description of passing perpindicularly through wake turbulence.

User currently offlineAaron747 From Japan, joined Aug 2003, 8137 posts, RR: 26
Reply 7, posted (4 years 8 months 3 weeks 6 days 11 hours ago) and read 2164 times:

Absolutely. Watch this video of a short final approach that passes through a vortex - the sudden bang and snap roll you see is classic wake effect.

http://www.youtube.com/watch?v=eblVIpdb1z8



If you need someone to blame / throw a rock in the air / you'll hit someone guilty
User currently offlineVikkyvik From United States of America, joined Jul 2003, 9960 posts, RR: 26
Reply 8, posted (4 years 8 months 3 weeks 6 days 10 hours ago) and read 2131 times:
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Quoting ThrottleHold (Reply 6):
Sounds like classic description of passing perpindicularly through wake turbulence.

That's what I thought as well.

Do you know what runway you were landing on? Given that Changi has 2 parallel runways (3 now, I guess?), spaced somewhere in the vicinity of 5000 feet apart; and given that the thresholds of said runways are offset by what looks like about 5500 feet longitudinally, could you have crossed the final approach for one runway while turning for final into the other?

Just an idea.



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlineBeakerLTN From United Kingdom, joined Jul 2009, 292 posts, RR: 0
Reply 9, posted (4 years 8 months 3 weeks 6 days 9 hours ago) and read 2112 times:



Quoting Vikkyvik (Reply 8):
Do you know what runway you were landing on?

at the time of the turbulence we were banking quite hard right in a northwards direction before joining the approach for 02R, so it's unlikely that we crossed through any parallel path.

Quoting Aaron747 (Reply 7):
Watch this video of a short final approach that passes through a vortex - the sudden bang and snap roll you see is classic wake effect.

That was it! - spot on at 21 seconds. Clear approach and then thump from no-where!

Thanks to all for your help! - I finally felt wake turbulence!



300/319/320/321/330/732/733/734/73G/738/744/772/77W/146/EMB135/EMB145
User currently offlineMandala499 From Indonesia, joined Aug 2001, 6849 posts, RR: 75
Reply 10, posted (4 years 8 months 3 weeks 6 days 9 hours ago) and read 2111 times:

Breaker, yeaps, that's wake turbulence mate... thanks to your better description  Smile

Well, last time I felt wake turbulence the plane had big blades in front of the engines  Smile



When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlineFLY2HMO From , joined Dec 1969, posts, RR:
Reply 11, posted (4 years 8 months 3 weeks 6 days 7 hours ago) and read 2080 times:

Definitely wake turbulence, felt it several times flying into PHX when following 737s in a wimpy C172.

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