Service difficulty report · Gearbox · Cessna 340A

Difficulty date
May 5, 2007
Submitted
May 30, 2007
Operation
General aviation
Aircraft
N2745F
Make and model
Cessna 340A
Aircraft serial
340A0949
Engine
Cont TSIO520*
Part
Gearbox
Part number
08940002
Condition
Damaged
Location
Mlg
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

GEAR MOTOR, REDUCTION GEAR BOX AND GEAR TRANSMISSION WERE REMOVED AND SENT OUT TO FOR INSPECTION. WHEN THEY OPENED GEAR REDUCTION BOX, THEY DISCOVERED THAT ONE OF THE MOUNTING BOLTS HAVE BEEN OF THE IMPROPER LENGTH CAUSING THE THREAD PATTERN. TBOLT SHOWS SLIGHT WEAR WHERE IT TOUCHED THE GEAR SYSTEM. ACCORDING TO MFG THERE WAS ONLY A SLIGHT TRANSFER TO GEAR, WHICH THEY FEEL WOULD NOT HAVE CAUSED A PROBLEM. CANNOT DETERMINE HOW LONG THIS CONDITION EXISTED. THE BOLTS LOOK TO BE OLD AND THE INTERNAL GEAR BOX SEEMS ALSO TO BE OLD. THE INSTALLATION CALLED FOR A .8750 INCH BOLT FOR THIS MOUNTING HOLE, AND REMOVED A 1 INCH BOLT. THE CORRECTIVE ACTION IS TO INSTALL THE REPAIRED GEAR BOX AND THE CORRECT MOUNTING H

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