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How safe is (airbus) fly by wire? Airbus A330/340 and A320 family emergency AD

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How safe is (airbus) fly by wire? Airbus A330/340 and A320 family emergency AD

Old 9th Jan 2013, 16:19
  #301 (permalink)  
 
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Dozy you are so disingenuous, I cannot keep a straight face.

It's gotten so slippery I put tire chains on my keyboard.
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Old 9th Jan 2013, 16:29
  #302 (permalink)  
 
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I'd hoped that the winking smiley on the end of the paragraph (not to mention that the paragraph itself was entirely off-topic) would be a clue that I wasn't being entirely serious...

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Old 9th Jan 2013, 17:05
  #303 (permalink)  
 
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This could also be coloured by my soft spot for the BAC 1-11 (which I thought was a lovely design and built like it was hewn from granite but let down by the choice of engine).
At the time the only engine available for the 1-11 was the spey as due to exchange regulations. It was not possible to purchase non UK engines.
An attempt to re engine with the Tay later on did not come to fruition.
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Old 9th Jan 2013, 17:09
  #304 (permalink)  
 
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Originally Posted by rogerg
At the time the only engine available for the 1-11 was the spey as due to exchange regulations. It was not possible to purchase non UK engines.
An attempt to re engine with the Tay later on did not come to fruition.
At the risk of going too far off-topic, I won't carry on past this post - but I was thinking of the RR Medways that were slated for the original version of the Trident (and sadly stayed on the drawing board when BEA 'Speyed' the Trident)...

There was a popular bit of piloting scuttlebutt that said the DC9 had the same "oomph" with an engine out that the 1-11 had with both working...

Last edited by DozyWannabe; 9th Jan 2013 at 17:12.
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Old 9th Jan 2013, 17:30
  #305 (permalink)  
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Dozy, Lyman, TTex, it's nice to have the old gang back. Please, continue bitching! Where's Clandestino?
 
Old 9th Jan 2013, 17:49
  #306 (permalink)  
 
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Originally Posted by wozzo
Dozy, Lyman, TTex, it's nice to have the old gang back. Please, continue bitching! Where's Clandestino?
Couple of pages back, but speaking for myself I'm really hoping we can avoid the hamster wheel this time!
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Old 9th Jan 2013, 18:11
  #307 (permalink)  
 
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Go-arounds

Yes, the One-Eleven-500 (the stretch) was ill-suited to operate charters out of Spain to the UK in the summer. Using the Spey’s water injection increased the RTOW by less than 400kg, IIRC, and meant loading about 120kg (?) of de-mineralised water. Overall improvement in available payload: 2or 3 pax. And after my time they even throttled it with a useless hush-kit...

TTex600,
Earlier on this thread we were discussing go-arounds, and the natural pitch-up tendency of aircraft with under-slung jet engines as G/A thrust is applied. (This tendency is, as you know, eliminated on Airbus FBW a/c in pitch-normal and pitch-alternate laws, but not in direct law.)

The 1-11 and its big brother, the VC10, gave little pitch-up because of their tail-mounted engines. Can you comment on the DC9, and if possible compare it with any under-slung jets you’ve flown with conventional flight controls?
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Old 9th Jan 2013, 21:02
  #308 (permalink)  
 
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Originally Posted by wozzo
Where's Clandestino?
Clandestino clandestinat?
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Old 10th Jan 2013, 06:26
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Originally Posted by DozyWannabe
Development and refinement of the FBW systems has continued significantly in the 24 years since the aircraft went into service,but therearelimitsto how much can be altered with the A320 itself without breaking type commonality.
Not only breaking type commonality : Changing a FBW system seems easier than conventional, but the greater complexity of FBW design increases the risks and number of tasks exponentialy with complexity of systems. Stabilisation of the computerised system is still a greater necessity for Safety.
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