[SystemSafety] Autopilot interface?

[Nick Tudor]

These things can be quite important. I was talking to a good friend of mine
today about a commemoration of the SAS work done at the end of WWII in the
Jura region. The event was a parachute jump into the same area as was done
in 1945; he was one of the jumpers. The weather was poor, low cloud and
rain. The local airfield from which the jump was to depart was at one
altitude ASL; the landing ground another. The French pilot was asked the
difference in order to calibrate altimeters....the parachutists said ok,
we’ll do it by eye then, .....on the way down.

On Sat, 10 Nov 2018 at 15:04, Chris Hills <safetyyork at phaedsys.com> wrote:

>
>
> > -----Original Message-----
> > From: systemsafety [mailto:systemsafety-bounces at lists.techfak.uni-
> > bielefeld.de] On Behalf Of Michael J. Pont
> >
> > I've never had responsibility for the design of an autopilot interface,
> but I'd
> > have thought that you'd probably want to make it difficult to set a
> target
> height
> > of 0 ft under these conditions?
>
> Height above sea level or height above departure and/or target runway?
>
> When an aircraft takes off or lands at "zero altitude" on the runway  the
> runway height above sea level can be anywhere from -1240 (Dead Sea) to
> +16,900 feet (base camp on Everest)  You have to accurately know the height
> above (or below) ground level on both the take-off and target runways  and
> any alternate runways.
>
> As we have seen, and it is not just around the Dead Sea,  these systems
> have
> to be able to handle negative through to positive numbers seamlessly.
>
> Regards
>    Chris
>
> Phaedrus Systems Ltd
> FREEphone 0808 1800 358    International +44 1827 259 546
> Vat GB860621831  Co Reg #04120771
> Http://www.phaedsys.com  chills at phaedsys.com
>
>
>
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-- 
Nick Tudor
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