Service difficulty report · Rotor · Cessna 207

Difficulty date
October 25, 2013
Submitted
September 14, 2015
Operation
General aviation
Make and model
Cessna 207
Aircraft time
15,141 hours
Engine
Cont IO520D
Propeller
Hartzl HCC3YF1
Part
Rotor
Part number
1052948
Condition
Cracked
Location
Magneto
Stage of operation
IN
How discovered
9
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) MAGNETO WAS RECEIVED WITH A TAG STATING "MAG DEAD". WHEN TESTED THE MAGNETO DID NOT PRODUCE A SPARK UNTIL OVER 1000 RPM. THE MAGNETO HAD ITS ORIGINAL TORQUE SEAL FROM TCM ON THE SCREWS, INDICATING IT HAS NOT BEEN APART SINCE O/H. THE POINTS WERE FOUND ARCED, AND THE ROTOR WAS FOUND TO BE CRACKED AND THE MAGNET SECTION HAD SPUN ON THE ASSEMBLY. THIS IS A 1 PIECE ASSY AND SHOULD NOT HAVE MOVED AT ALL. THE MAGNET SECTION SEEMS TO HAVE BEEN TURNED APPROXIMATELY 40 DEGREES AGAINST THE NORMAL DIRECTION OF ROTATION (CCW) OF THE MAGNETO (CW).

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