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British Airways A350 Hard Landing at Tel Aviv

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British Airways A350 Hard Landing at Tel Aviv

Old 27th Jan 2020, 06:56
  #41 (permalink)  
 
Join Date: Oct 2008
Location: Australia
Posts: 30
Flare Law

330 and 350 FCOMs present the same picture of Flare Law using different wording save the 350 not mentioning the slight pitch down elevator order at 50ft.
The 330 generates Reactive Windshear Warnings based on predicted AOA excursions (couldn't find it mentioned in 350 FCOM). I am aware that smooth stick inputs to recover an increasing descent rate can help prevent warnings being generated but I wouldn't have thought unloading initially to be warranted. But perhaps that's what transpired....
Busbuoy is offline  
Old 27th Jan 2020, 09:31
  #42 (permalink)  
 
Join Date: Nov 1999
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Originally Posted by EcamSurprise View Post
Basically a non-event causing an online discussion, with the usual criticisms from people who obviously know better.......
I must be reading a different thread. I can see no criticism of the A350 crew, and the thread has moved onto a discussion about auto-thrust and Vapp at very short finals.

Basically the Airbus FBW auto-thrust and G/S mini combination works extremely well. There are a couple of provisos to that statement: One is that the aircraft we fly can be heavier than we think from the load sheet. +2 tonnes is common, I did see nearly +4 tonnes once! So beware that Vapp might not be correct for your weight. Always check that Vapp bug is at least Vls+5kts, and adjust if necessary.

If you are in an A330, its auto-thrust is "lazy". On certain days it might let the speed dribble down to 3-4kts below bug, and this is something to be avoided, otherwise a heavy landing can result. My advice is to do something about that. On approach, if LDA is not limiting, you could adjust Vapp to be Vls+6 or Vls+7. Or simply use phase advance or go manual thrust.

Don't be afraid of manual thrust - Airbus say to take over if the system response is unsatisfactory - just make sure you understand what will happen when you use it, and practice using it on easy good weather days, so you are confident.

Once you are over the threshold, accept the speed you have and concentrate on the landing. Having said that, if speed is below Vapp-5kts, a baulked landing would probably be safer, unless you are totally confident about using manual thrust.

I am not a trainer, nor an authority, just what works for me. I have not flown A350 or A340.


Enjoy !
Uplinker is offline  
Old 27th Jan 2020, 14:22
  #43 (permalink)  
 
Join Date: Oct 2003
Location: Australia
Posts: 45
Good summary, Uplinker and I agree a good discussion I have learnt a lot.

i would disagree with this however:

Originally Posted by Uplinker View Post

...Or simply use phase advance...
...since Airbus has recommended this not be used. My airline banned it about ten years ago, never knew why until this thread explained the reason.

Agree with everything else you said. I treat A330 AT with suspicion particularly on short finals in any sort of gusty conditions. My rule of thumb is to add a few knots in these cases
FlareArmed2 is offline  
Old 28th Jan 2020, 03:13
  #44 (permalink)  
 
Join Date: May 2002
Location: GC Paradise
Posts: 1,047
If you find the AutoThrust is "lazy" on an approach you will probably find that the conditions are smooth and your sidestick inputs are also "slow" and smooth.

To "wake" the AutoThrust up and have it respond quickly, simple make some rapid (tiny) sidestick pitch inputs.

The way it was explained to me was that rapid sidestick pitch inputs cause a phase/gain shift in the AutoThrust response. This in turn makes thrust change response time quicker and magnitude larger.

Don't be over-smooth, fly it like a Navy carrier approach, hold the glide slope as accurately as possible with lots of tiny and timely sidestick pitch inputs.

You'll have that sucker eating out of your hand in no time!
FlexibleResponse is offline  
Old 28th Jan 2020, 16:52
  #45 (permalink)  
 
Join Date: Jan 2006
Location: US
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Exactly. Needlessly push and pull on the side stick to make it really fly. The thrust already goes up and down on it's own so adding in sidestick inputs might bring everything into harmony. Besides, being smooth is overrated. (sarcasm).

Surprisingly enough the AB products fly like regular airplanes with the autothrust/throttles off.

A 5 kt speed loss is being blamed for a hard landing?? Vicious winds, we should be damaging airplanes every day across the world.
misd-agin is offline  
Old 31st Jan 2020, 14:30
  #46 (permalink)  
 
Join Date: Nov 1999
Location: UK
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Originally Posted by misd-agin View Post
A 5 kt speed loss is being blamed for a hard landing?? Vicious winds, we should be damaging airplanes every day across the world.
No. I said that 5kt below bug CAN cause problems in an A330. And, yes, a colleague in a previous airline did a very hard landing in an A330 as a result of exactly this situation. After which our company recommended phase advance (since removed by Airbus).

It seems to be an A330 problem when there is no significant wind, so no G/S mini addition, but a hot day with thermals on finals. Not to me - I have hammered-in the occasional A321 due to stupidity on my part, but not an A330 (yet).
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Old 31st Jan 2020, 14:51
  #47 (permalink)  

Only half a speed-brake
 
Join Date: Apr 2003
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The standard bugged speed is Vref +5 kt buffer for A/THR deficiencies.

If eating into this margin and arriving at Vref, +1/+2 i.e. just above the normal and certified approach speed results in a slammer, it sounds a bit of an incomplete story to an outsider.

While you are not the first one to say so, I wonder what are the blanks that need filling.

THS freeze at 100?

Last edited by FlightDetent; 1st Feb 2020 at 19:30.
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