ARJ21 completes engine restart tests

Singapore
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Comac has completed tests validating the ARJ21-700's in-flight engine shut down and restart capability.

Aircraft 102 operated six flights totalling more than 13 flight hours to fully verify that the GE Aviation CF34-10A engines are able to restart safely during flight.

The tests were carried out at different altitudes, speeds and temperatures, so as to test the engines under harsh conditions, says Comac. It cited an example where a dual engine malfunction was simulated, and the aircraft had to rely on the aircraft's ram air turbine emergency system.

The ARJ21 regional jet project started 11 years ago and was initially scheduled for delivery in 2007.

The deadline has been pushed back several times as engineers encountered problems in the development and certification processes. Sources have said that the jet is unlikely to receive certification until at least late next year.