# SDR CA000925007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 15, 2000
- Submitted: January 19, 2001
- Operation: General aviation
- Make and model: Doug DC-6A
- Registry model: [Doug DC-6A](https://openairdocs.org/model/douglas-dc-6a) (OpenAirDocs)
- Aircraft time: 41,559 hours
- Engine: Pwa CB3
- Propeller: Hamstd 43E60
- System (JASC): [8520 · Reciprocating Engine Power Section](https://openairdocs.org/jasc/8520)
- Part: Bearing
- Condition: Failed
- Location: Master Rod
- Component: Engine Assy, Pwa, WASPCB3
- Stage of operation: TO
- How discovered: O
- Nature of condition: Y
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA000925007

## Discrepancy

(CAN) ON TAKEOFF ENGINE AUTO-FEATHERED, AND LOAD OF RETARDANT WAS JETTISONED. AIRCRAFT RETURNEDTO  AIRPORT WITH THREE ENGINES OPERATIVE. INSPECTIONS COMPLETED - I.E. NOSE CASE REMOVED AND CHIPPED TEETH FOUND ON COUNTER BALANCE DRIVE GEARS AND THE SUPPORT BEARING WAS FOUND CRACKED. ENGINE WAS RE-ASSEMBLED FOR THREE ENGINE FERRY. NOSE CASE WAS AGAIN REMOVED TO DETERMINE EXTENT OF DAMAGE. DAMAGE FOUND INDICATED A MASTER ROD BEARING FAILURE WHICH RESULTED IN THE MASTER ROD COMING LOOSE AND DAMAGING THE REAR CYLINDERS. SERVICEABLE ENGINE INSTALLED AND AIRCRAFT DISPATCHED FOR FIRE FIGHTING.

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