50 SKY SHADES - World aviation news

AW609 interim accident report released

Download: Printable PDF Date: 27 Jun 2016 00:16 category:
AW609 interim accident report released - Events / Festivals publisher
Krista Kuznecova
Country: Italy Aircraft: Helicopters

Italy’s National Agency for Flight Safety (ANSV) has released an interim report into the October 30 2015 fatal crash of Leonardo Helicopters’ AW609 which has identified the tiltrotor prototype was carrying out a diving manoeuvre as part of flight testing required for certification when the accident occurred.

Released on June 23, the interim report showed the tiltrotor, N604AG, the second AW609 prototype, experienced oscillations about the roll axis that were not accurately predicted by the manufacturer during its third dive for the test flight reaching an airspeed of 293kt.

The report said the pilot in command at the time, US national Herb Moran, corrected for the oscillations using normal flying techniques, however the 609’s flight control laws are currently designed to induce yaw inputs to compensate for expected aerodynamic effects from its flatirons.

ANSV investigators said this yaw input combined with roll inputs created a phenomenon similar to “an augmented Dutch roll”.

The report featured a map showing a widely spread wreckage trail suggesting the oscillations led to the tiltrotor breaking up in-flight near the town of Tronzano Vercellese, Italy.

The AW609’s project simulator, used for building and developing the tiltrotor’s flight control laws, was not able to reproduce the phenomenon that occurred during the accident flight. The only way for investigators to obtain a reliable representation was to input unrealistic geometric and aerodynamic parameters into the simulator.

The ANSV has so far made two recommendations to the Federal Aviation Administration (FAA) and European Aviation Safety Agency (EASA) calling for a review of the AW609’s aerodynamic behaviour at high speeds, making use of wind tunnel tests if necessary. Additionally, a review of the tiltrotor’s control laws in the management of extreme flight conditions to ensure the effectiveness of pilot inputs while avoiding the possibility of unexpected and uncommanded coupling effects.

Leonardo was still aiming to achieve certification for the AW609, the world’s first civil tiltrotor, before the end of 2017.


Loading comments for AW609 interim accident report released...


Aero-Dienst completes 120-month Global XRS check for Global Jet

Aero-Dienst, Nuremberg, completed the most comprehensive maintenance event on a Global Express XRS to the customer’s satisfaction. The workscope of the 120-month inspection included the dism...

Bell Helicopter's Mirabel facility celebrates completion of 5,000th aircraft

Bell Helicopter, a Textron Inc. company, announced that the company's Canadian facility located in Mirabel has completed its 5,000th aircraft.  The aircraft, a Bell 407GXP, will be owned b...

The ATR 72-600 tours West Africa

From December 11 to 14, an ATR 72-600 in the colours of Air Sénégal will embark on a demonstration tour in three West African countries. The best-selling regional aircraft in the below-9...

Ten AS565 MBe Panther helicopters in service in Mexico

On 6 December, the Mexican Navy received two final AS565 MBe Panther helicopters, completing the order of ten purchased in November 2014. Below, an overview of the qualities of this model, which has b...