Gabriel,
Suppose they do this "temporary, but good enough for Gabriel" repair. The airplane proceeds to lose that well-repaired wing in mid-air, the wing comes down and takes out one of your kid's school, while the rest of the aircraft comes down and takes out the other one's school. Do you still want that heap flown anywhere?
Yes, I know, your kids don't go to school anywhere near the slanteye continent, but you get my point...
Actually, no, I don't get your point.
Why would such a thing happen?
It's not like you are the one who would design, make and inspect the repair.
And in fact, you are not even going to fly it. Not for $2.50/hour (or whatever) anyway.
But let me explain you how it works:
But let me explain you how it works:
1- The plane was able to sustain flight for a couple of hours at a heavy weight. Heavy enough, in fact, that the landing was reportedly overweight.
2- If the damaged wing structure was strong enough to withstand that, it is, with no further repair, strong enough to withstand the load after removing all the payload (400+ passengers, their luggage, and any cargo that the plane was carrying) and some misc items (cabin crew, most of lavs and drinkable water, even the interior can be taken out).
3- But the structure will not be left like that. It will be repaired.
4- The repair will be done by a team of knowledgeable engineers. If you don't trust them, then better stay away of planes because they will likely be the same kind of teams that design the original structures to begin with.
5- Rest assured that any repair made on it will be to strengthen it, not to weaken it.
6- Since this structure will be used only for a ferry flight and never be part of a revenue flight, weight efficiency is not a main goal. Not even close to that. Practical effectiveness is. Be sure that it will be over-engineered. If the airplane will brake in flight, it will be somewhere else.
7- After the design is complete, a simulation will be made to validate the design and the expanded safety margin.
8- An application authority (or maybe more than one) will verify the design and the analysis.
9- Another team of professions, involving engineers and mechanics, mainly from the manufacturer but also from the airline, will make the repair.
10- Another team of engineers and QA, again involving the manufacturer, will inspect the repair, both in the field and documentally.
11- The application authority will oversee the whole process, and sign off the ferry permit.
Technically, It's perfectly possible to do it and do it right with a great margin of safety (how great? greater than the original plane). Nobody will want this wing to fail in this flight so the due diligence of all the parties involved will be, well, due.
In fact, since efficiency is not a goal here, I'd almost say that it's quite easy. Much easier than designing the original part. You don't care about the weight of the repair and the cost is of secondary concern (compared to the cost of a new wing or a write-off). Put enough metal there to withstand 10 Gs and there you go.