Development of China’s C919 single-aisle plane, already at least five years behi...
BEIJING/PARIS - Development of China’s C919 single-aisle plane, already at least five years behind schedule, is going slower than expected, a dozen people familiar with the program told Reuters, as the state-owned Commercial Aircraft Corporation struggles with a range of technical issues that have severely restricted test flights.
COMAC engineers miscalculated the forces that would be placed on the plane’s twin engines in flight - known in the industry as loads - and sent inaccurate data to the engine manufacturer, CFM International, four people familiar with the matter told Reuters. As a result, the engine and its housing may both have to be reinforced, the people said, most likely at COMAC’s expense – though another source denied any modification.
COMAC has still not finalised the correct calculations and data to send to the engine manufacturer, which are key to ensuring that the engine does not fail under heavy loads, one of the sources told Reuters. Another said load calculations often evolve during development. Regular inspections of the gearbox to check for cracks and leaking oil have curtailed COMAC’s flight test program, they said.
The C919 is designed to compete with the Boeing 737 MAX and Airbus 320neo families. After Boeing and Airbus struck deals to take over production of rival planes made by Embraer and Bombardier, China’s COMAC is now effectively the third option in the market for planes with more than 100 seats.
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