# SDR K2DA20110823001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 23, 2011
- Submitted: August 30, 2011
- Operation: Air carrier
- Aircraft: [N500PH](https://openairdocs.org/aircraft/N500PH), registered now
- Make and model: Hughes 369E
- Registry model: [Hughes 369E](https://openairdocs.org/model/hughes-helicopters-369e) (OpenAirDocs)
- Aircraft serial: 0187E
- Aircraft time: 15,714 hours, 15,962 cycles
- System (JASC): [6510 · Tail Rotor Drive Shaft](https://openairdocs.org/jasc/6510)
- Part: Drive Shaft
- Part number: 369D25518501
- Part serial: 6084A377
- Condition: Sheared
- Location: Tail Rotor
- Part time: 4,197 hours
- Stage of operation: TX
- How discovered: V
- Nature of condition: E
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/K2DA20110823001

## Discrepancy

PILOT NOTICED A VIBRATION & METAL ON METAL BANGING NOISE WHEN ACCELERATING FROM GROUND IDLE TO FLT IDLE.  PERFORMED EMERGENCY SHUTDOWN & NOTICED TAIL ROTOR APPEARED TO BE TURNING INDEPENDENT OF MAIN ROTOR.  INSPECTION REVEALED THE T/R DRIVE SHAFT HAD SHEARED AT AFT END OF PLENUM TUBE.  UPON TEARDOWN, DISCOVERED SPOT WELDS ON THE AFT SUPPORT OF T/R DRIVE SHAFT HAD BROKEN, ALLOWING SHAFT TO CONTACT TUBE.  DRIVE SHAFT TUBE REPLACED.   AFTER REPAIRS & DURING BALANCING TAIL ROTOR, FOUND ELASTOMERIC BEARINGS IN T/R FORK ASSY CAUSED OUT OF LIMITS VIBRATION.  T/R FORK ASSY REPLACED.  TAIL ROTOR BALANCED & AIRCRAFT RETURNED TO SERVICE.

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