June 1, 2016
All AEIO-320, -360, -390, -540 and -580 Aerobatic series engines
TIME OF COMPLIANCE
Every 300 hours of operation or any time there is evidence of oil discharge from the breather.
REASON FOR REVISION
Added 390 and 580 engine models and clarification.
This Service Instruction identifies necessary routine maintenance to be done on the inverted oil system of aerobatic Lycoming engines models.
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