First CSeries test aircraft re-enters ground vibration testing
The first CSeries test aircraft has re-entered a series of ground vibration checks less than a month after completeing first flight, Bombardier revealed today.
A nearly 3min clip posted on the companyÂ€™s YouTube channel on 16 October provides the first update on the test programme since the first test aircraft (FTV-1) stopped flying on 3 October.
The video shows the FTV-1 test aircraft parked inside a hangar and covered in test instruments.
Alexandre RathÃ©, a structure dynamic engineer for Bombardier, says on the video that the aircraft is undergoing ground vibration testing.
The aircraft is suspended off the floor of the hangar to simulate a flight situation, he says. About 400 accelerometers attached to the airframe measure vibrations created by oscillations applied to areas such as the wingtips and the engine.
Â€œUltimately with the input that weÂ€™ve created weÂ€™ll be able to determine the modes of vibration of the aircraft,Â€ RathÃ© says.
It was not immediately clear why the tests are necessary. Bombardier announced last June that the FTV-1 aircraft had completed ground vibration testing, a necessary step in clearing the aircraft for first flight. Bombardier has not responded to requests for an update on the test programme.
RathÃ© says the new round of tests will help the programme move forward.
Â€œSome adjustments may be necessary on our finite element models,Â€ RathÃ© says. Â€œThese [vibration] modes are very important from a dynamic point of view and they will predict the aircraftÂ€™s flight stability, so itÂ€™s very important to measure and model them properly.Â€
The CSeries completed the first flight test in
Bombardier is targeting to complete airworthiness testing in 11 months, including about 2,500h of flight testing.
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