Service difficulty report · Bellows · Cessna 401

Difficulty date
February 11, 1999
Submitted
March 26, 2000
Operation
General aviation
Make and model
Cessna 401
Engine
Cont TSIO520EB
Propeller
Mcauly 3AF32C87
Part
Bellows
Part number
08507311
Condition
Buckled
Location
Turbocharger
Stage of operation
IN
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) A FAULTY BELLOWS ASSEMBLY CAN CAUSE THE SEIZURE OF THE TURBOCHARGER. INTERNAL METAL BUCKLING AND PEELING OF THE EXHAUST CAN CAUSE PIECES TO DEPART INTO THE EXHAUST STREAM EVENTUALLY CAUSING THE SEIZURE OF THE TURBOCHARGER. THE MAINTENANCE SCHEDULE INVESTIGATES THIS PORTION OF THE EXHAUST SYSTEM BUT DOES NOT CALL FOR DISASSEMBLY OF THIS PART UNLESS THERE IS BULGING OR CRACKING VISIBLE ON THE OUTSIDE OF THE PART. THERE IS ALSO AN FAA AD 75-23-08 ADDRESSING THE SIMILAR EXTERNAL INSPECTION. THIS CONDITION IS NOT VISIBLE FROM THE OUTSIDE. CESSNA HAS AN ALTERNATE PART AVAILABLE, OPERATOR REPORTS THAT NO PROBLEMS OF A SIMILAR NATURE HAVE BEEN NOTED TO-DATE.

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