# SDR 20010606CW005

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 10, 2001
- Submitted: June 6, 2001
- Operation: Air carrier
- Aircraft: [N223AC](https://openairdocs.org/aircraft/N223AC), registered now
- Make and model: Skrsky S64F
- Aircraft serial: 64086
- System (JASC): [6220 · Main Rotor Head](https://openairdocs.org/jasc/6220)
- Part: Hinge Pin
- Part number: 6510311020102
- Part serial: A04100236
- Condition: Cracked
- Location: M/R Head
- Part time: 999 hours, 3,964 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20010606CW005

## Discrepancy

S-64F MAIN ROTOR HEAD HINGE PINS DO OCCASIONALLY CRACK FROM DAMPER NUT SAFETY HOLES (APPROX. 15 PERCENT OF THE TIME), BUT TYPICALLY THE CRACKS TRAVEL OUTBOARD TO THE EDGE OF THE HINGE PIN.  HINGE PIN SN A041-00236 CRACKED INBOARD THROUGH THE THREADS INTO THE THREAD RELIEF AND STARTED AROUND THE HINGE PIN.  APPROXIMATE LENGTH OF CRACK AROUND THE THREAD RELIEF IS .60 INCHES.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.