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29th Apr 2019, 00:16
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

I did not read the discussion for a weak and I...

I did not read the discussion for a weak and I find it partly very useless.
As an (automotive) safety engineer, I categorize the 'controllability' of an event in simple (>99%), normal (>90%) or...
22nd Apr 2019, 17:29
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

Safety culture and a certain independence within...

Safety culture and a certain independence within the organisation between the responsible safety managers and commercial decisions, is, at least within automotive & machine, part of the...
21st Apr 2019, 21:38
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

Maybe all the 'first world' planes have the...

Maybe all the 'first world' planes have the options 'plausibilization' and 'AoA display' ordered, so a single AoA failure is just worth a small note in the log?
21st Apr 2019, 19:17
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

Do we also need to learn again how tires are...

Do we also need to learn again how tires are manufactured? Millions of cars are driving perfectly safe but still cheap chinese wheels crack because they are manufactured cheap and without x-ray...
21st Apr 2019, 17:19
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

It's always the same story: a) System...

It's always the same story:
a) System engineering (writing system requirements and designing a 'system' before jumping on code and PCBs) is completely underestimated but failures at this stage have...
20th Apr 2019, 21:48
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

In case of an important 'warning' function you...

In case of an important 'warning' function you may want something fail-operational, your safe state is 'warn'. So you place an 'OR' logic within your redundancy.
In case of a -maybe dangerous-...
20th Apr 2019, 20:55
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

Please, don't make the mistake and put your best...

Please, don't make the mistake and put your best programmers on functional safety coding. Trust me, they will quit!

That's the whole point about safety: Even if a brain-dead, a greenpeace...
19th Apr 2019, 21:34
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

OK, first: I'm not a pilot, I'm a functional...

OK, first: I'm not a pilot, I'm a functional safety engineer, mostly working for automotive.
Second: I read this thread from the beginning and learned a lot, thanks!

But I think I can explain one...
9th Apr 2019, 10:41
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

But this proves that electronic trim is less...

But this proves that electronic trim is less powerful than manual trim, right? Or can the motor distinguish where the force is coming from?

To me as an engineer everything lines up if one adds...
9th Apr 2019, 09:59
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

Tesla used the same chip as Audi, BMW etc. from a...

Tesla used the same chip as Audi, BMW etc. from a company called Mobileye.
But Tesla called it AutoPILOT instead of Lane/TrafficASSISTANT and used the System far beyond it's clearly stated...
8th Apr 2019, 19:24
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

I fully agree, as an example the automotive...

I fully agree, as an example the automotive functional safety process has the following steps:
-> Hazard & Risk analysis
-> Functional safety concept
-> Technical system safety concept
-> System...
7th Apr 2019, 23:55
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

To me (as a functional safety engineer) it looks...

To me (as a functional safety engineer) it looks like the designers made a very common beginners mistake at the very beginning while designing MCAS.
This mistake can sometimes even be found within...
6th Apr 2019, 21:29
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

If I turn a thunb switch which should turn a...

If I turn a thunb switch which should turn a wheel and nothing happens, I release it before I cause further damage. Then I ask another person with another thumb switch if the other one is working......
2nd Apr 2019, 10:46
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

Are you sure they were still able to? If the...

Are you sure they were still able to?
If the forces on TRIM are that high that even Boeing mentions one may be forced to do it manually because the TRIM motor ist not powerful enough, why do you...
31st Mar 2019, 23:37
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

There are not many failure modes which may cause...

There are not many failure modes which may cause such a constant deviation. If normal checks are in place, it rules out everything except wrong calculation within or after atan(sin/cos). Cabling,...
31st Mar 2019, 13:46
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

I think that's the point: Redundancy is a...

I think that's the point:
Redundancy is a measure against random faults. Diversity is a measure against systematic faults.
A stone-age sensor which is working perfectly on one type of aircraft...
17th Mar 2019, 22:43
Replies: 5,120
Views: 10,490,178
Posted By TryingToLearn

Since I'm working on car functional safety, I'm...

Since I'm working on car functional safety, I'm sometimes around here just to learn from accidents in aviation.

This story here is, if true, really a deviation from good practice and established...
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