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> According to a footnote in the MAK report, at the time of the accident the flight crew operations manual (FCOM, a Sukhoi product) contained descriptions of Ai
by rdtsc 1y ago
> According to a footnote in the MAK report, at the time of the accident the flight crew operations manual (FCOM, a Sukhoi product) contained descriptions of Airbus controls laws instead of SSJ control laws. The reasons for this darkly hilarious mix-up are not elucidated in the report.
That is shocking, but not that shocking if you're familiar with how things are done in those parts.
So SSJ doesn't implement Alternate Law (mode) only Direct Law, but Sukhoi inserted Alternate Law descriptions from Airbus into the manual anyway. Just yolo copy-paste basically.
> UAC calculated that the probability of a Direct Mode reversion should be approximately 1 per 1.64 million flight hours [...] In 2015 alone, there were three such events, even though the entire SSJ fleet had accumulated just 81,000 flying hours
Heh "Our SLA is still in play, we just extended the time we'll average it by to 100 years"
- kalleboo 1y agoLooking forward to flight manuals being generated by AI in the future
- rob74 1y agoMaybe the FCOM was actually the design specification, i.e. how they wanted it to work, which however had significant differences from the final product? The article later points out that the many Direct Mode reversions probably have something to do with the Electronic Interface Units (EIUs) which are responsible for making sure the various off-the-shelf Western components (which were apparently not customized due to cost reasons) could talk to each other. So the only Russian-made (and thus technologically not so advanced) component in your design is also a single point of failure. What could go wrong?
- rdtsc 1y ago> Maybe the FCOM was actually the design specification, i.e. how they wanted it to work, which however had significant differences from the final product? Agree, that's probably what happened, yeah. It was probably a planned feature they had to cut at the last minute.