PPRuNe Forums - View Single Post - Afriqiyah Airbus 330 Crash
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Old 17th May 2010, 22:26
  #594 (permalink)  
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Join Date: Jun 2009
Location: florida
Age: 81
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Salute!

Adding to the others, C-SAR's inputs have been most useful to get an impression of what happened without the CVR/FDR. Outstanding on-the-scene info and pics. And PLZ try to stay outta trouble.

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I was puzzled by A4's description of the AoA limiter control laws.

How does the flight control computer know your altitude? AGL or baro?

Some of the angles A4 mentions seem very small. Actual stick angles or commanded elevator?

I flew FBW well before the Airbus, and tho our mission was vastly different, the basic rate and AoA limiters did not depend upon altitude. Control laws were different once gear was down, as AoA was more of a factor than "gee" command. Gains were different compared to clean configuration gains, but the thing felt like every other plane you had flown with gear and flaps down. The stick also used "pressure" and not degrees of movement. Hell, the sticks in the first 40 or 50 jets didn't move a mm. So I wonder about all the "normal" laws and the "other" laws and approach modes and ...

Gums sends ...

Viper pilot since 1979
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