R66 Service Letter SL-01 (Cracked MS21042L-Series Nuts)
Good day everyone. This question goes out to other Robinson R66 operators.
How many operators have experienced any fractured MS21042L-series nuts on the rotor head blade attachment ring?
Our helicopter has approximately 250 hours total time and we have already had to replace several of the self-locking nuts described above. We have not received any valid explanation as to why these nuts are failing prematurely. Feel free to contact me off line if you prefer.
Thank you.
JD