Fri, Mar 16, 2012
Crack Was Detected On The Lower Hub-Shaft Flange Of A Main Rotor Hub (MRH) Shaft
EASA has issued an emergency AD applicable to some Eurocopter EC 135 and EC 635 model helicopters.
During a periodical inspection of an EC 135 helicopter (pictured in file image), a crack was detected on the lower hub-shaft flange of a main rotor hub (MRH) shaft. The investigation is on-going and the cause of the cracking has not been determined yet. It has been established, however, that deformed safety pins, used to secure main rotor blade bolts, can indicate that bolts may have rotated, indicating possible cracking in one of the hub-shaft flanges.
This condition, if not detected and corrected, could lead to further crack propagation, possibly resulting in main rotor hub failure and consequent loss of the helicopter.
For the reason described above, the Emergency AD requires repetitive pre-flight checks of the main rotor blade attachment bolts and safety pins to detect rotated bolts. In addition, the AD requires a one-time visual inspection of the upper and lower hub-shaft flange for cracks and, if cracks are detected, replacement of the main rotor hub. The AD also requires reporting of any findings to ECD. EASA said in its notice that the AD is considered to be an interim action and further AD action may follow.
The AD is effective immediately.
Three-Eight Charlie If you know the name of the first woman to fly solo around the world, you’re ahead of most people. By the way, if you thought it was Amelia Earhart, you&r>[...]
Holding pattern. A racetrack pattern, involving two turns and two legs, used to keep an aircraft within a prescribed airspace with respect to a geographic fix.>[...]
“We need a world-class system of weather prediction in the United States – one, as the National Academy of Sciences recently put it, that is ‘second to none'." So>[...]
Send Them A Story -- We Don't Mind! Do you need another set of eyes to see that story you can't believe Jim just wrote? Want to spread Hognose's unique wisdom and perspective to th>[...]
Cites 'Strong Record On Aviation Security' The Association of Flight Attendants-CWA (AFA) has endorsed Congressman Ed Markey for the U.S. Senate, specifically noting his proven rec>[...]