Thierry Dubois is a freelance writer specializing in helicopters, business aviation and aerospace technology. He earned a degree in fluid dynamics from an engineering school in Toulouse, France in the mid-1990s. At an unexpected crossroads, he found his first job in journalism. In 1997, he started working for French aerospace weekly Air &amp; Cosmos in Paris. This lasted until 2000, when he moved south to Lyons. He then became a freelancer, working for various aerospace publications and has been part of the AIN team since late 2000. In addition to writing about business aviation, Thierry shares responsibility for the rotorcraft section. He also is a regular on-site writer for AIN’s daily editions at international airshows such as the Paris, Farnborough, Dubai and Singapore shows, as well as at EBACE in Geneva.
In 2007, he won the Honeywell award for “Best systems or technology submission” at the Aerospace journalist of the year awards. In 2013, he won an Aerospace Media Award for the "Best Safety, Training &amp; Simulation Submission."
In other activities, Thierry moderates international conferences on aviation technology topics. Thierry is married and has three children, who seem to begin enjoying the mountains–as their parents do.

Writer

Thierry Dubois

The EASA issued an emergency Airworthiness Directive for Eurocopter EC225 medium-twin helicopters, requiring operators to closely monitor vibrations. The emergency action stems from a May 10 incident involving an EC225 operated by Bond Offshore Helicopters, which safely ditched, with 14 on board, into the North Sea. Under the AD, those EC225s not equipped with vibration health monitoring are restricted to day VFR for flights over water.


The Bond EC225 investigation is focusing on the failures of two main gearbox lubrication systems–standard and back-up. According to the UK’s Air Accidents Investigation Branch (AAIB), the event began when the main gearbox oil pressure gauge indicated zero. The crew initiated a descent and then activated the emergency lubrication system. However, the warning light for this system, designed to allow 30 minutes of flight, quickly illuminated, prompting the pilots’ decision to ditch.


After the incident, Bond suspended EC225 and later AS332L2 Super Puma flights. The AAIB identified a “360-degree circumferential crack in the bevel gear vertical shaft in the main gearbox.” This caused disengagement of both mechanical (standard) oil pumps.


On May 15, Bond announced the resumption of all flights. This was the result of “a rigorous engineering analysis and safety risk assessment.” A Eurocopter spokesman noted that neither the AAIB nor the EASA had required any aircraft grounding.

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