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Search: Posts Made By: TryingToLearn
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Forum: Accidents and Close Calls
17th Jan 2024, 09:08
Replies: 1,950
Views: 928,308
Posted By TryingToLearn

To me logic does! Think back to the MCAS issue:...

To me logic does!
Think back to the MCAS issue:
One mayor concept error during the SW design lead to a latent fault. Wrong input could make the SW feature go mad.
Normal defects (birdstrike...)...
Forum: Accidents and Close Calls
16th Jan 2024, 22:25
Replies: 1,950
Views: 928,308
Posted By TryingToLearn

Systematic faults tend to show up in random...

Systematic faults tend to show up in random occasions, that's what safety is about. That's how the MCAS fault showed up, planes were flying with it for some time, people here pointed at the pilots...
Forum: Accidents and Close Calls
15th Jan 2024, 13:54
Replies: 1,950
Views: 928,308
Posted By TryingToLearn

This statement made me think of another possible...

This statement made me think of another possible chain of events:
The tension in the fuselage (along the circumference) will expand the doorframe, increasing the distance between roller pin and...
Forum: Rumours & News
29th Apr 2019, 00:16
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
22nd Apr 2019, 17:29
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
21st Apr 2019, 21:38
Replies: 5,109
Views: 13,103,058
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?
Forum: Rumours & News
21st Apr 2019, 19:17
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
21st Apr 2019, 17:19
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
20th Apr 2019, 21:48
Replies: 5,109
Views: 13,103,058
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-...
Forum: Rumours & News
20th Apr 2019, 20:55
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
19th Apr 2019, 21:34
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
9th Apr 2019, 10:41
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
9th Apr 2019, 09:59
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
8th Apr 2019, 19:24
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
7th Apr 2019, 23:55
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
6th Apr 2019, 21:29
Replies: 5,109
Views: 13,103,058
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......
Forum: Rumours & News
2nd Apr 2019, 10:46
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
31st Mar 2019, 23:37
Replies: 5,109
Views: 13,103,058
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,...
Forum: Rumours & News
31st Mar 2019, 13:46
Replies: 5,109
Views: 13,103,058
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...
Forum: Rumours & News
17th Mar 2019, 22:43
Replies: 5,109
Views: 13,103,058
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...
Showing results 1 to 20 of 20


 
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