On The Fly…
Lycoming has issued Mandatory Service Bulletin 554, which calls for removal of bad crankshaftretaining bolts installed in their engines and replacement of the bad boltswithin the next 10 hours or seven days of operation (whichever comes first).Affected engines are all O, IO, (L)TIO or AEIO-540 engines that have had acrankshaft bolt replaced during maintenance or […]
