Service Bulletin No. 643

Crankcase Nut Safety Wire Inspection

Publications

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)

DOWNLOAD PUBLICATION
header_0

Product Support Network

Lycoming has a worldwide product support network so you can access the technical, training, and service information you need at your own convenience.

We are here to help. As a Lycoming customer, you have access to our worldwide team of authorized distributors and service centers. The Lycoming team helps you stay up-to-date on industry insights, and provides information about how to care for your engine.

Learn more

Get It Exchanged

Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.

Contact Us