By Robert Wall 

PARIS-- Airbus Group NV on Thursday said the head of its military plane operations is stepping down days after the company's chief executive vowed to make changes following ongoing problems with the A400M military airlifter.

Domingo Ureña-Raso, who previously ran the A400M program, offered to resign and will be replaced by Fernando Alonso Fernández, the head of flight testing, the world's second-largest plane maker said in a statement.

Mr. Alonso will take up the post March 1, with Bernhard Gerwert, chief executive of Airbus Defence and Space in the role on an interim basis.

On Tuesday, Airbus Chief Executive Tom Enders apologized for the performance on the A400M program. "Let me assure you that there will be management and organizational consequences to the program," Mr. Enders said.

The project has been hit by a series of production delays and technical defects and Airbus in November warned that earnings could be hit as a result. The project, which Airbus once considered abandoning because of spiraling costs, remains unprofitable for the company.

Development of the A400M already ran billions of euros over cost and years behind schedule as Airbus and its partners struggled with birthing everything from the aircraft's large turbo-propeller engines to some of its complex systems.

"I expect that the new team will rapidly address existing shortfalls in the most efficient way," Mr. Gerwert said.

Airbus said the A400M program would also be restructured with people focused on building the plane and fully developing its capabilities. Early models of the transport plane don't have all the features customers have requested.

"We will do our utmost to overcome them so the customers receive the aircraft they need in the shortest time possible," Mr. Gerwert said. The company added that the in-service planes operated by countries such as France and Turkey, "are showing good performance with the aircraft exceeding its specifications in its strategic, logistical role."

Airbus has booked 174 orders for the A400M, with Malaysia, a group of six European countries and Turkey backing its development. Some countries also have cut the size of their order.

The company needs more deals to ever make money on the project, Airbus has said. Export campaigns for the plane are one of the group's priorities this year, Airbus officials have said.

Prospects to sell the plane could be aided by a Boeing Co. decision to cease building the larger C-17 airlifter. The Chicago-based plane maker said on Wednesday it had seven more of the planes to sell.

Airbus reports 2014 full-year financial results on Feb. 27 when it will disclose the impact on its earnings from the A400M difficulties.

A new position is being sought for Mr. Ureña-Raso within Airbus, the world's second largest plane maker said.

Mr. Ureña-Raso became Executive Vice President of Military Aircraft at the Airbus Defence and Space unit a year ago. He began his career in 1982 as an engineer at Spain's CASA that is now part of Airbus. His replacement Mr. Alonso, also a Spaniard, joined the Airbus jetliner unit the same year.

Write to Robert Wall at robert.wall@wsj.com

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