A French prosecutor’s office said Tuesday it is appealing the court ruling that blamed Continental Airlines for the deadly crash of a supersonic Concorde jet outside Paris a decade ago.

Prosecutors at the court in Pontoise, outside Paris, had argued that the former head of the Concorde program at planemaker Aerospatiale should share some legal responsibility with Continental for the crash.

The July 2000 crash of an Air France Concorde killed 113 people — all 109 people aboard and four on the ground. Most victims were Germans heading to a cruise. After years of investigations, the case went to court this year.

On Dec. 6, the court convicted Continental Airlines Inc. and one of its mechanics for manslaughter. Henri Perrier, who long headed Aerospatiale’s Concorde program, and two other French officials, as well as the Continental mechanic’s supervisor, were cleared.

The court confirmed investigators’ long-standing belief that mechanic John Taylor fitted a faulty metal strip on a Continental DC-10 weeks before the crash. It said the strip fell onto the runway, puncturing the Concorde’s tire, sending bits of rubber into the fuel tanks and starting the fire that brought down the plane.

The court ordered a 15-month suspended sentence for the mechanic and about $2.7 million in damages and fines for him and the company. Both have said they will appeal.