The memorandum details an investigation into high levels of low frequency vibration experienced by the owner of CV s/n 1085 during the climb and cruise phase of flight. The investigation was conducted at the GAC Brunswick Service Center, where accelerometers and microphones were used to collect data. The analysis revealed a 12/ harmonic on the left engine's Ni spool during climb through 36000 feet. Recommendations include performing a 180° clocking of the left engine fan and a fan trim-balance on both engines to mitigate vibration.
documents/EFTA01198313.pdf
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