Beechcraft C33A Debonair Alternator Rotor Shaft Failure Alternator failed, the third failure in less than 100 hours (other failures occurred at 288
Wear And Tear
During normal inspection of the right magneto of a Lycoming IO-540-AB1A5 installed on a Cessna 182T, the distributor brush was found badly worn. Wear is exactly as described in SB3-08, although more extreme, and magneto s/n and manufacturing date are outside the SBs applicability range. The other magneto exhibited more extreme wear signs and also was unaffected by the SB.
Key Takeaways:
- A Beechcraft C33A Debonair experienced three identical alternator rotor shaft failures in under 100 hours, pointing to a recurring component issue.
- A severe Slick 6363 magneto bearing seizure led to engine lock-up and camshaft gear damage in a Piper PA46-350T.
- Other reported incidents include an arcing Cessna 172S avionics master switch, worn Slick 6351 magneto distributor brushes (even outside service bulletin applicability), a cracked vertical stabilizer skin on a Pilatus PC-12, and a fatigue-induced main landing gear torque link failure on a Piper PA-180.
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