PPRuNe Forums - View Single Post - TAM A320 crash at Congonhas, Brazil
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Old 16th Aug 2007, 20:54
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Lemurian

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BOAC,

Have you still your non-Mod hat on ?
The problem is when what it thinks you want and what you actually want are not the same. We can go back to the beginnings of AB history and see the same problem - the Indian crash, the Strasbourg crash, Habsheim.
Why is it that these same three accidents are the only references to man-airplane interface ? After all, there have been a few other instances in the past 15 years (date of the Strasbourg accident) they have been argued about for years and they are not demonstrative. The Iberia 320 landing incident in Bilbao would have been a far better demonstration of your intent, for instance.

TyroPicard,
Page 2: From 18:48:20 to touchdown four seconds later I would expect to see increasing back stick in the flare.
Instead, on the graph Stick Long-L the stick goes to 4° back then neutral then 9° forward then neutral. Full deflection is 20° so 9° is a sizeable nose down input about one second before touchdown.
From first WOW there is dual stick input - RHS has a fairly steady 1 to 2° back stick for 6 seconds, during which LHS goes to 6° back to land the nosewheel. Not something you usually do.
Is the Stick Long - L graph representative of usual stick position in the flare?
TP, IMHO, the graphs are consistent with a landing with a very short flare and an entry into ground effect, well managed by the pilot. See the pitch trace which shows the -expected - nose up movement and the "landing" of the nose-wheel. The passage of the 50 ft point to the touch-down takes only three seconds and he landed slightly before passing abeam of the Glide shack.
If anything, the pilot knew how to maneuver that airplane.
What is a lot more worrying to me (as the RHS stick movements you mentioned are a lot weaker on this latest graph and can be due to the natural involuntary movements on the stick..) is that from T.S 18:48:28, the Capt has in all apparence left the side stick, and the action has been taken over by the F/O, without the CVR showing such transfer. (As an SFI, I would suspect that you would insist on the proper procedure for it )

Last edited by Lemurian; 16th Aug 2007 at 20:55. Reason: a mess of paragraphs !
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