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-   -   Heavy Landing (https://www.pprune.org/spectators-balcony-spotters-corner/226656-heavy-landing.html)

Flap 5 22nd May 2006 09:24


Originally Posted by Re-entry
Was box office witness to A340 bounce today. After said gravitational challenge event, it pitched down violently to the point it was going to become a wheelbarrow , whereupon it pitched up again and landed. I wonder how much pitch action was pilot induced, how much 'what's it doing now?'.

The bogey main wheels on the A330/ A340 hang trailing wheels first. If you try to land smoothly on the rear mains and then hold off the front mains will come down heavily. Therefore the best technique for a smooth landing on these machines is to do what the auto pilot does and that is to touch down on the rear mains then pitch down quite quickly to bring the front mains on to the ground smoothly while you still have some speed, without smacking the nose gear down. Then smoothly touch the nose gear down.

Maybe this pilot tried that but overcooked the pitch down?

Flap 5 22nd May 2006 09:35

... or maybe the other pilot thought he was going to hit the nose gear hard when the nose pitched down and pulled his stick back to the accompaniment of 'Priority Right', 'Priority Left', 'Priority Right', etc.! :}

Flap 5 22nd May 2006 13:59


Originally Posted by Re-entry
Was box office witness to A340 bounce today. After said gravitational challenge event, it pitched down violently to the point it was going to become a wheelbarrow , whereupon it pitched up again and landed. I wonder how much pitch action was pilot induced, how much 'what's it doing now?'.

Reference your last sentence: On (a manual) touchdown the airbus is in 'Direct Law' (flight control law). Therefore the pilot has total control and there will not be any 'what's it doing now?' moment. During the approach it will be in 'Normal Law' which means the aircraft will fly keeping a 1G loading. This means that increased thrust with underslung engines does not result in a nose up and decreased thrust does not result in a nose down. Otherwise the pilot has full control.

meatball 24th May 2006 20:30

LEARNING THE HARD WAY
 
Just yesterday on approach to GCXO, runway 30 in use. Encountered sudden drop of airspeed at 150 ft, autothrust engaged, managed speed. Wind from the West, gusting to 20 kts, clear skies. Increased manual N1, spool up time just delivering when mains slammed unto the tarmac on the 900 ft marker, bounced about ten feet I reckon, plenty of runway, expletives and more, managed to stay on centerline, reversers,exiting on C2 red faced but appreciative of another mega lesson learnt landing a big jet, A 330/300 at Tenerife North.

Doors to Automatic 25th May 2006 12:10


Originally Posted by meatball
Just yesterday on approach to GCXO, runway 30 in use. Encountered sudden drop of airspeed at 150 ft, autothrust engaged, managed speed. Wind from the West, gusting to 20 kts, clear skies. Increased manual N1, spool up time just delivering when mains slammed unto the tarmac on the 900 ft marker, bounced about ten feet I reckon, plenty of runway, expletives and more, managed to stay on centerline, reversers,exiting on C2 red faced but appreciative of another mega lesson learnt landing a big jet, A 330/300 at Tenerife North.

Did you make an announcement or did you stay quiet?

Milt 26th May 2006 04:56

Not familiar with a "cabin not secure for landing". Always thought they were securely attached! Has any one ever lost one during a landing considering they do follow behind fairly closely.!

meatball 26th May 2006 19:47

Yes, I made a little speech to the passengers and also a report to tower, as should be expected.

barit1 3rd June 2006 01:41


Originally Posted by jondc9
...
I also know of one case in which the loading was not accuratley computed and the plane landed at 20 knots below the correct Vref speed. The landing gear punched a hole in the wing....

AOA display would go a long way toward precluding this, methinks. :eek:

TOGA Descent 3rd June 2006 05:20

[QUOTE=Flap 5]

Originally Posted by Doors to Automatic
The go-around was initiated from around 30-40 ft agl and the (rather dubious) explanation given that the cabin wasn't secure for landing!
[/QUOTE
Rather dubious? If the cabin is not secure for landing the captain is obliged to go around.


Ummm, but with most reputable airlines, that decision is made at 1000 feet AGL. If the cabin is not ready then, the aircraft goes-around from that point.

In this case - from such a low altitude - I would tend to believe that it was something other than the cabin not being ready.


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