Comac has "successfully completed" the hot weather fuel flight test on its ARJ21 regional jet.
The Chinese airframer says the test, conducted on 10 August, was the first hot weather fuel flight test carried out in strict accordance to the civil aviation regulations.
It adds that the test verified the performance of the jet's fuel system under extremely hot weather conditions.
Recently, Comac also completed a nacelle cooling validation test on its ARJ21, finalising all the high temperature and high humidity flight tests required.
During the test, it was also verified that the jet's auxiliary power unit, fire protection and fuel systems are able to perform under high temperatures and severe weather conditions.
Sources have said that the ARJ21 is unlikely to receive certification until at least late next year. The regional jet project started 11 years ago and was initially scheduled for delivery in 2007. The deadline, however, has been pushed back several times as engineers encountered problems in the development and certification processes.