Service difficulty report · Connecting Rod · Bnorm BN2B21

Difficulty date
March 4, 2003
Submitted
June 16, 2003
Operation
General aviation
Make and model
Bnorm BN2B21
Aircraft time
9,676 hours
Engine
Lyc IO540K1B5
Part
Connecting Rod
Condition
Fractured
Location
Nr4 Cylinder
Stage of operation
IN
How discovered
O
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) THE CAUSE OF THE ENGINE FAILURE WOULD BE DUE TO NR 4 CONNECTING ROD BOLTS FRACTURING AT THE CRANKSHAFT JOURNAL. WITH THIS HAPPENING IT BECOMES DISCONNECTED & COMPLETELY DESTROYES THE CRANKCASE IN THATAREA AND PUSHES THE NR 4 CYLINDER OFF OF IT'S BASES PULLING AND STRIPPING ALL OF THE CYLINDER STUDS.