Latest / The Operations Podcast with Fexingo: Process, People, and Profit in Modern Business / How Airbus Reengineered Wing Production for the A350
Transcript
- Lucas: You look at an Airbus A350 on the tarmac and the wing is just this long, sweeping curve — beautiful, carbon-fiber, nearly 32 meters from root to tip. But what most people don't see is that the wing is actually built in three separate chunks and then bolted together. Luna: Three separate pieces? I assumed a wing like that would be one monolithic structure, especially with composites. Lucas: That's what Boeing did with the 787 — one-piece barrel sections. Airbus took a different path. And the operations story behind that decision is fascinating because it wasn't about aerodynamics. It was about manufacturability and supply chain risk. Lucas: So here's the setup. The A350 wing is split into a fixed wing box — that's the center section that attaches to the fuselage — plus a left outer wing and a right outer wing. Each section is built at a different facility. The center box comes from Nantes in France. The outer wings come from Broughton in North Wales. And then they all meet at the final assembly line in Toulouse. Luna: So you've got three factories in three countries feeding one wing. That's a coordination nightmare. Lucas: Exactly. And the joints between those sections — that's where the operations challenge gets really interesting. Because the wing has to carry hundreds of tons of load, and the joint can't be a weak point. Airbus designed a titanium fastener system — basically huge bolts — to connect the carbon-fiber composite sections. Lucas: Now, this is not a standard bolt. Each fastener is a custom titanium alloy, about the diameter of your thumb, and they're installed with a precise interference fit. You have to drill the hole, chill the bolt in liquid nitrogen to shrink it, insert it, and let it expand to room temperature so it locks in place. That's one bolt. There are roughly 800 of them per wing. Luna: Wow. So the bolt installation itself is a whole production process — a cryogenic step inside an assembly line. Lucas: Right. And Airbus had to build dedicated workstations just for that. But here's the payoff: by splitting the wing, Airbus was able to parallelize the production. Instead of one giant wing moving down a single line, you've got three smaller lines running simultaneously. That cut the total wing cycle time dramatically. Lucas: Before the A350, a typical widebody wing took about 30 days in final assembly. The A350 wing — from arrival of the three sections to a complete wing ready for fuselage join — takes 11 days. Luna: Eleven days. That's a 60 percent reduction. And that's before you even attach the wing to the plane. Lucas: Exactly. Now, the counterargument — and Boeing made it loudly — is that those joints add weight and potential fatigue points. Boeing argued a one-piece wing is structurally more efficient. But Airbus's counter was that the manufacturing simplicity and supply chain flexibility more than offset the aerodynamic penalty. Luna: And they were willing to accept a few hundred extra kilos of fastener weight in exchange for a much faster, more reliable production line. Lucas: Yes. And they also hedged their supply chain risk. If one factory goes down — say Broughton has a labor dispute or a tooling failure — they can theoretically keep producing the other sections and stockpile them. With a one-piece wing, if that single production line stops, the entire airplane program stops. Lucas: Now, there's a deeper operations principle here that I think is worth pulling out. It's the classic trade-off between design optimization and manufacturing optimization. Aerospace engineers love to optimize for weight and performance. But operations people care about throughput, repeatability, and supply chain resilience. The A350 wing is a case where the operations team won. Luna: And they didn't just win on cycle time. They also improved quality, right? Because smaller sections are easier to inspect. Lucas: Big time. Each wing section goes through its own non-destructive testing — ultrasonic scans, X-ray — before it ever meets the next section. You catch a defect in the outer wing at Broughton, you don't have to scrap the entire wing. You just rebuild that one section. That's a massive reduction in rework cost. Luna: So the split-wing design is really a risk-management strategy disguised as a manufacturing choice. Lucas: That's a perfect way to put it. And the numbers back it up. Airbus reports that the A350 wing assembly has one of the lowest defect rates in the industry — about 0.3 defects per wing, compared to an industry average around 1.2 for similar-class widebodies. That's a 75 percent improvement. Lucas: Now, the titanium fastener process I mentioned — the liquid nitrogen shrink-fit — that was itself a source of early headaches. When they first started production around 2012, the installation成功率 was only about 85 percent. Bolts would warp, holes would be misaligned, and they'd have to drill out and replace fasteners, which took hours. Luna: So how did they fix it? Did they redesign the bolt? Lucas: Partly. But the bigger fix was in the drilling operation. They realized the carbon-fiber layers were delaminating slightly at the hole edge, which created an uneven surface for the bolt. So they changed the drill bit geometry and added a diamond-coated reamer. That alone pushed the success rate from 85 percent to 97 percent. Lucas: And they also changed the inspection protocol. Instead of checking every tenth hole, they moved to 100 percent inspection with a laser profilometer. That caught the delamination before the bolt ever went in. So the fix was a combination of tooling improvement and process control — classic operations. Luna: It's almost like they treated the bolt installation as a mini manufacturing line within the larger line. And they applied the same kaizen principles Toyota would. Lucas: Exactly. And that's not an accident. Airbus has been systematically applying lean manufacturing principles across all its programs since the early 2000s. The A380 was a wake-up call — that program was an operations disaster, with massive delays and cost overruns. The A350 was designed from the start with manufacturability as a first-class requirement. Lucas: I think that's one of the most important lessons from this story. If you wait until after the design is locked to think about how you're going to build it, you've already lost. Airbus embedded operations people in the design teams from day one. The wing split decision was made in 2006, years before the first composite layup. Luna: So the operations team had a seat at the design table. And they used it to push for a design that made the factory's life easier, even if it made the engineers' lives slightly harder. Lucas: Exactly. And the result is a production system that has allowed Airbus to ramp up A350 production from about 5 per month in 2018 to 10 per month by early 2026, with a target of 12 by the end of the year. That ramp would be much harder with a one-piece wing. Lucas: Now, speaking of things that make operations smoother — and this is a bit of a tangent, but it's related — one thing that keeps this show ad-free and independent is listener support. If these conversations have moved your work forward in some small way, you can help keep them coming at buy me a coffee dot com slash fexingo. No pressure, just a way to support the kind of deep-dive operations stories we try to tell. Luna: Yeah, and I think it's fitting — we talk about production systems that are resilient and efficient, and listener support is what makes this production system resilient. So if you've gotten value from episodes like this one, that's the place. Lucas: Alright, back to the wing. One more piece of the operations puzzle I find fascinating: the logistics of moving those wing sections. The outer wings from Broughton are transported by a custom barge called the 'Ciudad de Cadiz' — it's a roll-on, roll-off vessel specifically designed to carry A350 wing boxes from the UK to France. Luna: So they built a custom ship just for wing transport? That's insane. But also exactly the kind of vertical integration you'd expect when you're moving something that expensive. Lucas: Right. And the barge docks at the port of Bordeaux, then the wings go by truck — a special convoy that runs only at night to avoid traffic — to the final assembly line in Toulouse. The whole journey takes about four days. And they've got it down to a science: the barge schedule is synced with the production schedule so that the wings arrive just as the previous set is being attached. Luna: Just-in-time delivery across international borders, with a custom barge and nighttime truck convoys. That's an operations ballet. Lucas: It really is. And it's a reminder that great operations aren't just about what happens inside the factory walls. The entire supply chain — from the carbon-fiber suppliers in Japan to the titanium forge in the US to the barge in the English Channel — has to be coordinated. Airbus estimates that each A350 wing involves over 50,000 individual parts sourced from 400 suppliers across 30 countries. Luna: So the wing split decision wasn't just about the factory. It also made the supply chain more manageable, because each section has a smaller, more focused supplier base. Lucas: Exactly. The left and right outer wings each have their own dedicated supply chains. If one supplier has a disruption, it doesn't cascade to the other wing. That kind of modularity is a huge operational advantage. Lucas: So what do we take away from this? I think the core lesson is that design choices have massive downstream operations consequences. Airbus chose a slightly heavier, more complex wing geometry — but that choice unlocked a production system that is faster, more reliable, and more resilient. It's a textbook example of design for manufacturability. Luna: And it shows that sometimes the best engineering solution isn't the one that optimizes the product in isolation. It's the one that optimizes the entire system — product plus production plus supply chain. Lucas: Yeah. And the A350 has gone on to be a commercial success — over 1,200 orders — so the market has validated that trade-off. The wing works, the plane flies efficiently, and Airbus can build them at a rate its competitors struggle to match. Luna: I think that's a great note to end on. Next episode, we're going to look at a completely different industry — I'll give you a hint: it involves a lot of water. Lucas: Looking forward to it. See you then.