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From: David Gillon <david.gillon@baesystems.com>
Subject: Re: Interresting thread in comp.lang.eiffel
Date: 2000/07/24
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Date: 2000-07-24T00:00:00+00:00
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"Robert I. Eachus" wrote:

> > The gains changed abruptly when the aircraft transitioned from
> > takeoff-and-landing to up-and-away mode. This produced a sudden transient,
> > triggering the start of the PIO. The transition now occurs more gradually.
> 
>    That fixes the primary cause, but not the actual failure mode.  Does
> the stick now
> have tactile feedback?  Or has the rate limit on the stabilator been
> changed?  (Yes,
> avoiding sudden non-pilot-induced control inputs is a very good thing.
> But tactile
> feedback, such as stick shakers for stall warnings have the great
> advantage of
> focusing the pilot on where the action is needed.

Tactile feedback from the stick isn't the problem here, it's the rate at
which the feedback loop functions. Even without the stick moving the
pilot is getting sensory feedback from his inner ear and visual cues.
However by the time he's responded the aircraft is already into the
wrong part of the cycle and his actions exacerbate the situation. You
need to change the control laws, not the pilot/aircraft interface. 

-- 

David Gillon