China's COMAC is expanding production facilities for its homegrown C919 jets in Shanghai, according to one of the project contractors, as the state-owned planemaker ramps up manufacturing to fulfil hundreds of new orders.

China Aviation Planning and Design Institute (Group) Co. Ltd. (AVIC-CAPDI), a state-owned provider of aviation planning and construction services, said on its WeChat account at the end of April that the company had "recently won the bid for the second phase of the C919 large passenger aircraft batch production capacity construction project".

AVIC-APC said the project was in Pudong, Shanghai and had a total construction area of 330,000 sq m. COMAC is headquartered in Shanghai.

"The completion of the project will meet the future batch production needs of the C919 large passenger aircraft, effectively improving its production efficiency and providing strong support for the commercial operation and market competition of domestically produced big aircraft," it said.

The second phase of the project, according to AVIC-CAPDI, mainly includes the construction of an assembly plant, parts warehouse and tarmac area. It was not immediately clear what the first phase of the project was.