PPRuNe Forums - View Single Post - AF447 final crew conversation - Thread No. 1
Old 28th Jan 2012, 20:55
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OK465
 
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It would also be interesting learn how much lag there is in updating the PFD display in the A330.
Machin(e)bird:

Here's the info from AC-25-11A, Electronic Flight Deck Displays:

from page 47,

Data update rates for information elements used in direct airplane or powerplant manual control tasks (such as attitude, engine parameters, etc.) equal to or greater than 15 Hertz have been found to be acceptable. Any lag introduced by the display system should be consistent with the airplane control task associated with that parameter. In particular, display system lag (including the sensor) for attitude which does not exceed a first order equivalent time constant of 100 milliseconds for airplanes with conventional control system response is generally acceptable.
In practicality there is not even a remotely discernible lag in relation to actual aircraft response on modern PFD's or HUD's.

I flew the old 'Vital 4' visual system on the A-7 simulator in the mid 70's, probably equivalent to your A-4 sim visual. Those were so bad, many people would develop a persistent dizziness bordering on nausea for hours at a time after the session. Our rule was you could not fly the actual aircraft on the same day after completing a simulator training period.

(I think if you grabbed hold of an Airbus SS you'd be somewhat underwhelmed by the roll responsiveness in roll direct, even at altitude. But indeed no doubt this can be a relative thing depending on background and training.)
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