Airbus SE supplier Sofitec Aero SL has told employees it is working on a joint plan with the planemaker to address panel-quality problems that have disrupted aircraft deliveries. 

The Seville, Spain-based company told staff the plan would focus on “several specific aspects that need refining and that will help us improve,” according to a message seen by Bloomberg. “Airbus has informed us that we will have heavier workload starting in January, so we must continue expanding our capabilities,” Sofitec said in the message.

Airbus has sent inspectors to check on production, which is expected to ramp up in the coming weeks to replace the faulty parts, according to a person familiar with the matter, who asked not to be named because they are not authorized to discuss the matter.

Airbus said it has a joint plan with Sofitec, with quality and supply chain specialists on site.

Sofitec did not immediately reply to calls and emails seeking comment.

The supplier is at the heart of recent quality-control problems that forced Airbus to cut its 2025 delivery target. Flaws were found on Sofitec-made panels for the company’s bestselling A320 that deviated in thickness and prompted inspections on more than 600 aircraft. Some are in service, but most are still on the production line.

Separately, a union representing Sofitec workers, has previously accused the supplier of broader issues at the factory, including falsifying production-process dates and using expired materials. The union has also said the company had been targeted by government inspectors over health and safety standard lapses. Airbus has said it was unable to comment on specific claims by the union.