Turbomecc ALERT TELEx
Probably be an AD released I'm guessing
"TURBOMECA has been informed of an accident which occured on July, 13th 2005 in Nimbus Dam (California,
USA) on an EC 120B fitted with an Arrius 2F engine. The NTSB is currently conducting an investigation, in which
TURBOMECA is actively involved.
The first results from the investigation indicate:
- the rupture of free turbine blades, contained inside the engine
- gas generator damage
- deterioration of the constant delta pressure diaphragm.
The most likely explanation for this event would be the deterioration of the constant delta pressure diaphragm that
could have led to an increase of the fuel flow and of the gas generator speed. Even though the information that we
have in our possession at this point is not sufficient enough to establish a detailled sequence of events, it would
seem as though the increase in the fuel flow could have led to the engine damage.
As soon as the investigations and analyses allow us to validate the sequence of events leading to the engine
damage, TURBOMECA will contact you again to provide you with the appropriate recommendations.
"