Service Bulletin No. 643
Crankcase Nut Safety Wire Inspection
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)
Product Support Network
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Get It Exchanged
Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.