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Flying into a thunderstorm isn't forbidden, it's just not a good idea and generally avoided. Planes are designed to take a lightning strike without issue, I've been on a plane that was struck.
I'd say losing critical flight control surfaces on the wing isn't "without issue".
Are you one of those trolls that spreads misinformation online about Japan
If you are just stop
I've researched the place because it's in my list of countries I'd like to live in and most misinformation is from tourists misunderstanding stuff and / or causing trouble for the locals and online trolls
Once you research Japan the misinformation goes away and you get a better understanding of the country and its people
It's also very odd that you're going out of your way to target Japanese pilots when there has been many other videos online of planes from other countries being struck by lightning and pilots are trained to fly through thunderstorms in multiple countries
https://youtu.be/aQYoMfaq6aQ
This one was in Brazil where the plane was parked at the terminal
https://youtu.be/YXH9S1ZVl3s
This one is from a plane landing in Toucumen International Airport in panama City which I assume is in america because americans often don't state the country online leading to confusion
https://youtube.com/shorts/LnYKsQoi5g8
This is from a plane leaving Richmond, B.C Canada
https://youtube.com/shorts/c5mLjdoJ1h4
This is in seattle, washington america
https://youtube.com/shorts/T0-wmZuioXY
This plane is landing in dallas, texas america
What you also haven't considered is that landing & take-off conditions are different for every airport and every area that has an airport has a seasonal average weather type
Have you ever seen a bird land on an electric fence or live electric line and be just fine?
airplanes are struck by lightning all the time. They are designed against it, something wasn't done right that caused the issue you are describing. A plane should not be effected by the strike to the point it's no longer easily operational.
Being said, airlines try to avoid it when possible as it can lead to costly inspections and downtime to verify it's still flight ready.
It's not a critical flight control surface, it's a secondary control surface that adds extra lift at the cost of efficiency. Lightning is not inherently dangerous to airplanes. They are struck all the time, and it is fine besides alarming passengers and occasionally causing some minor concerns and repairs. Composite aircraft like the 787 need significant additional lightning protection though, this is a known risk for them, and Boeing intentionally decided to decline to lightning protect non-essential areas of the aircraft despite the potential for lightning damage, and that is a perfectly safe albeit probably financially and reputationally stupid decision.
For the aircraft, having slats stuck in either position is obviously not great and not having it available potentially limits the available landing options but it is not a safety issue. Efficiency concerns may result in the flight being unable to continue, but again, not a safety issue as they carry extra reserve fuel for unplanned contingencies like this and have alternate airports available to land at anywhere along their route. As a mechanical issue where a single incident cost the airline in question hundreds of thousands of dollars in revenue and delays and shuffling around other aircraft and flights to cover for the loss, it will be investigated and addressed if possible. But nothing unsafe happened here, except to ANA's revenue. Inconvenient, frustrating, maybe even alarming, but not unsafe.
That's one report. Every plane is hit on average once or twice a year, occasionally something minor will happen.
https://www.weather.gov/safety/lightning-planes
It's a landing flap, not an aileron. All losing it is going to do is make it somewhat more difficult to land the plane.
The anomaly isn't that the plane was struck by lightning, it's that it loose all control surfaces.
Thunderstorm can cause huge up/down draft + haze and therefore aren't recommended even for airliner (which typically would need inspection after being stuck inside) but shit happens