Yaw problems with fenestron equipped helicopters
Having survived a 'moment' with a 365N during which momentary loss of yaw control was experienced and the situation rectified by full application of opposite (right) pedal I reported the problem to the engineers just in case it was some sort of yaw AP problem (we had been having some problems with the yaw stab). The engineer came to find me the following day carrying a photocopy of a EC Service Letter dated about 10 years previously (so about 1990) drawing the pilots attention to a situation in which there could be a loss of yaw control when taking off with a wind from the starboard quarter. They implored the pilot NOT to take the aircraft flying in an attempt to regain control and instead suggested that he apply full opposite pedal and land as soon as possible.
I had landed and parked into wind but when we came to leave the wind was indeed from the starboard quarter. Never new about that problem until I read the Service Letter. Anyone else heard of it?
G.