Service difficulty report · Retainer Cup · Cessna 305A

Difficulty date
June 13, 2001
Submitted
July 5, 2001
Operation
General aviation
Make and model
Cessna 305A
Aircraft time
13,962 hours
Engine
Cont O47011B
Part
Retainer Cup
Part number
6682
Condition
Failed
Location
Alternator
Part time
73 hours
Component
Alternator · Skytronics · 7565T1
Stage of operation
IN
How discovered
V
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) ALTERNATOR REMOVED FROM A/C AFTER PILOT REPORTED NO INDICATION OF CHARGE AFTER HIS LAST LANDING. SMALL PIECES OF METAL AND RUBBER FELL OFF THE ACCESSORIES CASE UPON REMOVAL OF ALTERNATOR. LOOKING CLOSELY TO THE ALTERNATOR SPLINE GEAR AND DRIVE SHAFT, EVIDENCE OF DAMAGES WERE FOUND. THE RETAINING CUP AND TH RUBBER BUSHINGS WERE COMPLETLY SHREDDED. THE SPLINE GEAR LUGS WERE ALSO BROKEN.THE RETAININGCUP AND RUBBER BUSHINGS ARE MOUNTED BETWEEN THE SPLINE GEAR DRIVING SHAFT AND THE ROTOR SHAFT OF THE ALTERNATOR. THIS INSTALLATION IS DESIGNED TO SHEAR OFF AND PREVENT DAMAGES TO THE ENGINE IN THE CA S WHERE AN ALTERNAOTR SHAFT WOULD SEIZE UP. IN THIS CASE, THE ALTERNATOR SHAFT COULD BE TURNED FREEY

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