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Airbus A320 Fly by wire corrupted by radiation in flight

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21–30 of 74 posts

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#21
post #18

Earlier quoted context omitted.

100% of what? Those things have ECC and redundancy to the hilt. The data corruption odds are real and higher than one would expect but still not very high.

Look at pag 138...and correlation with altitude...: https://www.atsb.gov.au/sites/default/files/media/3532398/ao...

Yes, look at page 135 as well. They don't know, they have educated guesses. It could be SW, it could be hw.

EMI causing bugs is the equivalent of "bad juju".

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#23
post #22
post #8

So the patch will be physical, I imagine. ("Apply this very expensive special tape from (e.g.) 3M here and here.")

I've read the EASA emergency airworthiness directive, it's only a software change.

A software change that remedies solar radiation issues? Cool.

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#24
This is highly unusual, so there may be something more to it than only speculation about radiation. The emergency AD says:

> Before next flight after the effective date of this AD, replace or modify each affected ELAC with a serviceable ELAC in accordance with the instructions of the AOT. > > A ferry flight (up to 3 Flight Cycles, non-ETOPS, no passengers) is permitted to position the aeroplane to a location where the replacement or modification can be accomplished.

That's a very limiting AD. The "before the next flight" part is unusual, ADs often have a limit to the next inspection or X flight hours or similar, not immediately.

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#25
post #24

This is highly unusual, so there may be something more to it than only speculation about radiation. The emergency AD says: > Before next flight after the effective date of this AD, replace or modify each affected ELAC with a serviceable ELAC in accordance with the instructions of the AOT. > > A ferry flight (up to 3 Flight Cycles, non-ETOPS, no passengers) is permitted to position the aeroplane to a location where th…

Is some major new solar activity imminently expected that explains the urgency?

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#26
post #3

Emergency Airworthiness Directive 2025-0268-E: https://ad.easa.europa.eu/ad/2025-0268-E https://ad.easa.europa.eu/blob/EASA_AD_2025_0268_E.pdf/EAD_2... This was the incident that triggered the investigation: https://avherald.com/h?article=52f1ffc3&opt=0 https://edition.cnn.com/2025/10/30/us/jetblue-flight-emergen... List of Airbus A320 family operators: https://en.wikipedia.org/wiki/List_of_Airbus_A320_family_ope...

According to the airworthiness directive: Affected ELAC: Elevator aileron computer (ELAC) ELAC B L104 Serviceable ELAC: ELAC B L103+ So it's a regression that affects decades old aircraft. Of course Airbus is now also meddling with "AI": https://www.airbus.com/en/innovation/digital-transformation/... Obviously there no direct connection here, but it seems that destabilizing perfectly working aircraft could be the pro…

From what I have heard of how much Airbus pay people . . “Much” is the wrong word.

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#27
post #9

The title sounds like speculative clickbait. From https://www.airbus.com/en/newsroom/press-releases/2025-11-ai... : Analysis of a recent event involving an A320 Family aircraft has revealed that intense solar radiation may corrupt data critical to the functioning of flight controls. This is different from the core claim that the incident was caused by radiation. What are the prior probabilities that the system was ex…

How can a ~bit flip can cause something that bad? It would mean everything else like you mention would also be that bad. Bad ram, bad hard disk, loose wire, bird hits the plane, everyone jumps at once, leaking military jamming.

Radiation should be covered under normal safety, along with they already shield for it.

People often wrongly blame things on radiation, bit flips etc. when they don't know the real cause. A well known pattern.

There is a Hacker News item that was on high repeat where they eventually they solved the ~'cosmic radiation bug' as they first called it. Cannot remember the link.

It will not be true no matter what the, I know 'interesting' facts, 'I have a wiki link', crowd tell you. Real life is boring (and amazing). See Heisenbug's - https://en.wikipedia.org/wiki/Heisenbug

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#28
post #23
post #22

Earlier quoted context omitted.

I've read the EASA emergency airworthiness directive, it's only a software change.

A software change that remedies solar radiation issues? Cool.

Instead of 3 copies make 7 for majority vote?

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#29
post #23
post #22

Earlier quoted context omitted.

I've read the EASA emergency airworthiness directive, it's only a software change.

A software change that remedies solar radiation issues? Cool.

Easy enough to imagine. Something improperly was judged to not need concencus, running the calculation twice, or some other software mitigation. Revise process to include mitigation.

Re: Airbus A320 Fly by wire corrupted by radiation in flight

#30
post #7

Caused uncommanded pitch down, could exceed structural integrity of aircraft. There are redundant units - unknown why this can happen given redundancy.

Also not very clear how they attributed the failure to solar radiation.

I don’t think they did. Their analysis indicates that it could, and this analysis happened as part of an investigation of an incident, but they don’t say that was definitely the cause of that incident.
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