Airbus Traces A321neo Stringer Coating Flaw to a Supplier

TOULOUSE — Airbus has confirmed a deviation in the corrosion protection on stringers in the lower forward fuselage of a batch of A321neos, and told The Air Current that the problem originated with an undisclosed second-tier supplier, one that supplies Airbus's direct suppliers. A person familiar with the matter told Reuters on Thursday that the flaw affects about 500 aircraft, roughly 250 already in service and 250 still in production, and that the longer-range A321XLR is not among them.

The Air Current, which first reported the issue on September 24, put the number at more than 500. In a statement Airbus shared with Aviacionline, the manufacturer said: "Aircraft can continue to operate. This is a quality issue, not a safety issue." It added that "the source of the issue has been identified, contained and a remedy is available," and that "all newly coated stringers conform to all requirements."

The timing matters because the A321neo carries Airbus's narrowbody ramp-up. A321s made up roughly three-quarters of the A320 Family backlog at the end of June, as Airways reported when Airbus held its 2026 delivery target in July. Reuters reports that Airbus is pushing for record deliveries this year while trying to raise A320 Family output to 75 aircraft a month.

The flaw and its source

Stringers run the length of the fuselage and stiffen its skin, while the frames circle it. Airbus's statement places the deviation in the stringers' surface protection "at the lower front section of the fuselage" and says it was found "during some standard rework." The primer and coating are there to protect the structure from corrosion over its service life, and The Air Current reported that the flaw could reduce corrosion resistance inside the fuselage.

In a report published on Friday, Reuters cited two industry sources as saying that a subcontractor to Italy's Leonardo handled the anti-corrosion layer. Leonardo is one of the A321neo's aerostructures suppliers alongside Airbus Atlantic, the in-house unit formerly known as Stelia. Leonardo declined to comment.

Reuters' Thursday source said Airbus first noticed the problem during the summer, with early findings from a closer analysis arriving recently.

Delivered jets and possible regulatory action

"The rework doesn't require any disassembly of the stringers," Airbus said of the fix. "Once rework is applied, the aircraft is considered to be back as if at nominal design."

Reuters' Thursday source also said that Airbus has advised customers there is no immediate requirement to repair, and that customers are still taking deliveries without insisting the work be done first. Reuters added that European regulators could still issue a directive requiring repairs within a set period. People familiar with the matter told The Air Current that aircraft not corrected before delivery will need in-service inspections and rework over the coming years.

The European Union Aviation Safety Agency (EASA) list of recent airworthiness directives and proposed directives, checked on Friday, showed none on the stringer issue. Neither Airbus's statement nor the publicly available reports reviewed for this story identify the affected serial numbers or operators.

Delta Air Lines (DL), which flies the A321neo, said it was continually in contact with manufacturers and would "always take action to meet or exceed operator recommendations and regulator directives," according to Reuters.

Deliveries and the ramp-up

The Air Current reported that the affected jets not yet delivered are at various stages of completion within Airbus's supply chain in Europe, the US, and China, and that reworking them is likely to put pressure on medium-term deliveries.

Airbus has not changed its full-year guidance. "Our full-year guidance was formally stated during our first-half results on 29 July—this remains our current public position," a spokesperson told Reuters. That guidance calls for around 870 commercial aircraft deliveries in 2026. Airbus had delivered 475 commercial aircraft through August, according to Reuters, leaving about 395 for the last four months of the year. In the same July results, Airbus said it expects the A320 Family to reach between 70 and 75 aircraft a month by the end of 2027. Reuters puts the current rate at about 60.

A Jefferies analyst wrote that tracking data showed eight deliveries so far this week, suggesting deliveries were "not meaningfully affected at this stage," Reuters reported. Airbus shares were down just over 1% in early Paris trading on Friday.

Citing industry sources, Reuters reported that the stringer flaw leaves Airbus facing questions over quality control in the biggest part of its factory system for the second time in less than a year. In December 2025, a quality issue with fuselage panels, which Reuters said came from a Spanish supplier, led Airbus to lower its 2025 delivery target from about 820 aircraft to about 790. EASA proposed an airworthiness directive on those panels on December 17, 2025, and issued the final directive on March 13, 2026. It covers A319neo, A320neo, and A321neo aircraft whose serial numbers Airbus listed in an alert operator transmission to airlines, and requires panel inspections on those with certain earlier repairs. The agency said the thickness deviations, in combination with certain repair conditions, could affect structural integrity.

Airbus's statement on the stringers does not say how long the rework takes per aircraft, or whether delivered jets can have it done during scheduled maintenance.