PPRuNe Forums - View Single Post - A320 the big flaw of the UNRELIABLE SPEED/ADR CHECK procedure
Old 10th Jun 2011, 09:35
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jaja
 
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On a recent A320 sim-check, we had the following scenario :

In T/O just after rotation, we got 2 unreliable ADR`s, that both had the same failure of increasing airspeed, rapidly increasing to above 400 kts.

That means, that even though they are faulty, they wote out the remaining good ADR.

And what happens on the A320 in an overspeed situation : VMO/MMO + xx kts/0.xx mach, the A/C starts to pitch up, even though you manually try to pitch down !

And even more scary, with A/THR engaged, it reduce to idle due to higher speed than targetspeed. (We are not quite sure if this a "simulator thing" that it reduces to idle, can`t find anything about it in the books. Anyone confirm ??)

So with a rapidly increasing pitch and thrust at idle, things start to evolve very very quickly ! (and in this scenario very close to the ground). You have to do the following quickly, not a memory item (we are talking seconds) :

Solution : Select 2 ADR`s to off (doesn`t mean anything which two) and then you can apply the pitch/power procedure.
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