What was found
NR 1 ENGINE PRODUCED SMOKE ON EXHAUST DURING WALK AROUND. REPLACE LPT SHAFT PLUG O-RING. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
NR 1 ENGINE PRODUCED SMOKE ON EXHAUST DURING WALK AROUND. REPLACE LPT SHAFT PLUG O-RING. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.