[SystemSafety] System safety: software vs. hardware including aircraft hardware

[Peter Bernard Ladkin]

On 2019-03-25 15:24 , E. Douglas Jensen wrote:
> For those who haven’t seen this, it is well put.
> 
> https://drive.google.com/file/d/1249KS8xtIDKb5SxgpeFI6AD-PSC6nFA5/view?fbclid=IwAR0XjHLmehzfLmgxTDVNrHsfy-4ycdEVWfN-rC4-l8FCTzQf-D9NH-AOs60
It is also, as far as I can tell, misleading.

I haven't heard any valid suggestion that this had anything to do with engine power and pitch-up on
power application. The software was intended to counter the phenomenon that, in a wind-up turn at
high AoA, the stick forces became lighter with increasing AoA (due apparently to the lift generated
by the nacelles). The airworthiness requirements say they should become heavier.

A puzzle which no one yet seems to have solved is that the elevator forces should be able to
overcome stabiliser trim at any setting, so why was the crew unable to arrest the rapid descent?

PBL

Prof. Peter Bernard Ladkin, Bielefeld, Germany
MoreInCommon
Je suis Charlie
Tel+msg +49 (0)521 880 7319  www.rvs-bi.de





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