authorities seized the third prototype in May 2016, and returned it for flight testing in July. The final report stated that during a high-speed dive with a left turn, "slight lateral-direction oscillations" started on roll-out and grew in amplitude and frequency. The pilot attempted to correct the roll with "counterphase input roll manoeuvres and then pedal inputs", but this did not dampen the oscillations. They instead became divergent, bringing the sideslip angle at 10.5°, well above the 4° maximum allowed, "inducing contact of the right proprotor with the right wing due to excessive flapping of the proprotor blades". This severed fuel and hydraulic lines in the wing leading edge, triggering a fire. Specifications (BA609) See also References Bibliography Further reading External links AgustaWestland AW609 at LeonardoCompany.com AW609 promotional video by AgustaWestland at YouTube.com Video of VIP and Rescue interiors, interview with test pilot by AVweb 2000s international civil utility aircraft Tiltrotor aircraft AgustaWestland aircraft Aircraft first flown in 2003 T-tail aircraft