# SDR 20010613CW024

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 2, 2001
- Submitted: June 13, 2001
- Operation: Air carrier
- Aircraft: [N137US](https://openairdocs.org/aircraft/N137US), registered now
- Make and model: Bell UH-1L
- Registry model: [Bell UH-1L](https://openairdocs.org/model/bell-uh-1l) (OpenAirDocs)
- Aircraft serial: 151874
- System (JASC): [5531 · Vertical Stabilizer, Spar/Rib](https://openairdocs.org/jasc/5531)
- Part: Spar
- Part number: 2050308465
- Condition: Cracked
- Location: Vertical Stab
- Component: Tailboom Assy, Bell
- Component part number: 204030800493
- 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/20010613CW024

## Discrepancy

FATIGUE CRACK OCCURRED ON RIGHT HAND VERTICAL FIN SPAR MEMBER APPROXIMATELY .5 INCH FORWARD OF THE 90 DEGREE GEARBOX ATTACH FITTING.  THIS CRACK WAS DETECTED DURING COMPLIANCE OF AD.  PROBABLE CAUSE: FATIGUE.  REMOVED AND REPLACED VERTICAL FIN SPAR ASSEMBLY IAW AD,  SHOULD PRECLUDE THE PROBLEM.

---
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.