Late but hopefully useful
This thread is galloping forwards so fast that I'm replying to something three pages ago, but it was only a few hours ago, and it needs answered because it is another daft blind alley.
Someone said:
Quote:
I can't believe anybody would certify an airliner that is stalled but the stall warning mutes because the pitot static system senses less than 60 knots. That is nuts.
I think you will find that is completely normal, and even a microsecond of thought will tell you why. Think "parked on the taxiway". There's a strong chance the wing is fully stalled, but we'll supress the stall warning until we've got some speed up, thank-you.
I think that you will find it is normal to use an undercarriage microswitch so that when the aircraft is 'sat on the runway' the weight compresses the oleo and the microswitch says 'ON' when the weight is off the undercarriage the microswitch says 'OFF'. This is used for OOOI by ACARS but apparently is too simple for the Airbus design team who instead put in a system that was based on their assumption that at less than 60 kts the aircraft will be on the ground.
That was an incorrect assumption which in this case may have been one of the series of errors that ended with a destroyed aircraft.