Service Bulletin No. 643

Crankcase Nut Safety Wire Inspection

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Service Bulletin No. 643

Crankcase Nut Safety Wire Inspection

September 16, 2021

MODELS AFFECTED

Lycoming engines identified in Tables 1 and 2

TIME OF COMPLIANCE

Aerobatic engines – within the next 10 hours of operation or next scheduled maintenance event, whichever occurs first (Table 1).
Non-aerobatic engines - within the next 50 hours of operation or next scheduled maintenance event, whichever occurs first (Table 2)

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