They can't even get the correct numbers to match the CFM engines for their C919.How to fly?
COMAC (Shanghai Pudong) has encountered multiple issues during the certification of its C919 and completed only 20% of its planned certification flight hours by December 2019, Reuters has reported citing sources related to the manufacturer.
According to the sources, one of the problems pertains to erroneous calculations of wing loads related to the LEAP-1C engine, which has required a redesign of the engine and its shells. COMAC has yet to finalise the new design and provide new details to CFM International.
COMAC also discovered horizontal stabiliser cracks and engine gearbox cracks during the test. The former has already been resolved, while the latter has not yet, the sources said.