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Old 25th Sep 2020, 13:26
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neilki
 
Join Date: Sep 2007
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FBW

Originally Posted by Tail-take-off
Mi68uel
You keep telling everyone to try it in the simulator. Why don’t you do the same? We’re all eagerly awaiting your report on the results!
I for one would love a deep dive technical volume on how Fifi actually works. The current publications are targeted at line pilots; and often those converting from a conventional jet.

The Airbus does use G & Roll Rate, but it also takes into account G Rate. -From memory, CLB modes command different delta G depending on the change in Altitude selected -thats in the FCOM.
Consider a similar situation to the Crosswind discussion; an Engine Failure at 50' in SRS with the AP engaged. The Flight Control Computers are perhaps taken by more of a surprise than the Pilot on a PC (!!) but Fifi gets upset and struggles to correct the roll and yaw for a good couple of seconds. Look at the FLT CTRL page. It's like the LED display on a 90's boombox.
Under manual flight in VMC the maneuver can be performed more smoothly.

The bottom line for crosswinds, just like Airbus says; is the jet is designed to land just like a Boeing. Thats why the ELACs introduce a pitch snapshot then command nose down.
In a strong crosswind, rudder will introduce roll; given a couple of seconds the roll will be corrected; but in the flare at ten feet; we don't have a couple of seconds and the pilot actually has to fly the jet. Bank angle to correct drift et al..
PS. The Airbus does not have a yaw damper. It has a FAC that contains yaw damping functionality, but the FAC sends commands to the Rudder Hydraulics based on what it understands is going on..

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