Service difficulty report · Connecting Rod · Cessna 402B

Difficulty date
January 19, 2010
Submitted
January 20, 2010
Operation
Air carrier
Aircraft
N3796C
Make and model
Cessna 402B
Aircraft serial
C402B0803
Aircraft time
8,835 hours
Engine
Cont TSIO520E
Engine time
1,452 hours
Part
Connecting Rod
Part number
642399
Condition
Destroyed
Location
Engine
Part time
1,452 hours
Stage of operation
CR
How discovered
O
Nature of condition
Y
Precautionary procedure
A

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

What was found

WHILE IN CRUISE FLIGHT, THE PILOT REPORTED THE LT ENG SUDDENLY LOST FUEL FLOW AND RPM. HE ATTEMPTED TO RESTART THE ENGINE SELECTING OTHER FUEL SOURCES WITHOUT SUCCESS. HE THEN FEATHERED THE PROPELLER AND PROCEEDED TO THE NEAREST SUITABLE AIRPORT WHERE HE MADE AN UNEVENTFUL LANDING. UPON ARRIVAL, MX WAS NOTIFIED AND A MECHANIC DISPATCHED TO INVESTIGATE THE POSSIBLE CAUSE. WHEN THE ENG COWLING WAS REMOVED IT WAS DISCOVERED THAT THE NR 5 CONNECTING ROD HAD FAILED AND PUNCTURED A HOLE IN THE TOP OF THE ENG CASE. THE DIPSTICK WAS PULLED AND FOUND TO STILL HAVE TEN QUARTS OF OIL REMAINING. NO DEFINITE CAUSE OF THE ROD FAILURE IS KNOWN AT THIS TIME.

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