Originally Posted by
boeingdriverx
My point of view on the Habsheim crash is better described by the following FCOM 1.27.20 p3 paragraph:
"FLARE MODE: (...) as the aircraft descend through 30ft, the system begins to reduce the pitch attitude, reducing it to 2 degres nose down over a period of 8 econds"
Nice wind up.
Selective quoting on your part, by leaving out the important bit in the (...) it paints a different story. Also left the bit out after the last sentence.
The aircraft adds a bias into the control system equivalent to pilot control input that would result nose attitude that is two degrees lower than what the attitude was when passing 50 over a period of 8 seconds.
It does not try and reduce the attitude to 2 degrees nose down over a period of 8.
A pilot can still get a 15 degree nose up in the flare even if passing 50ft the nose attitude was zero simply by pulling back on the control stick.
You have also mislead people by not also stating what happens when TOGA is selected as per FCOM 1.22.30.
Originally Posted by
boeingdriverx
Pilot lack of knowledge? Airbus bad design?
I think you will find he was with the test pilots when it was certified, and had done low passes and low level alfa max before in a test aircraft at a more suitable location. Not with a bunch of passengers, fully briefed and prepared, and not over rising terrain with obstacles at the end.
Originally Posted by
boeingdriverx
But the latter Flight Controls designs on the A330 and A340 show lots of differences compared to the initial A320 design. On the 330/340 no more FACs or ELACs but 3 PRIMs and 2 SECs
Still much the same, the three primary computers took over from the ELACs and SECs, the secondary computers took over from the FACs. The number of computers was reduced by one, and the circuit breakers moved under the floor.
The design is almost the same between them, some FAC functions went into the PRIMs, MLA was added, LAF removed, additional spoilers and actuators. Control systems gains were kept similar so that handling characteristics similar between the family.