# SDR 2011FA0000657

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 3, 2011
- Submitted: October 3, 2011
- Operation: General aviation
- Aircraft: [N45AD](https://openairdocs.org/aircraft/N45AD), registered now
- Make and model: Bell UH-1H
- Registry model: [Bell UH-1H](https://openairdocs.org/model/bell-uh-1h) (OpenAirDocs)
- Aircraft serial: 6616899
- Aircraft time: 8,588 hours
- System (JASC): [6210 · Main Rotor Blades](https://openairdocs.org/jasc/6210)
- Part: Blade
- Part number: 204011250113
- Part serial: AFS12045
- Condition: Cracked
- Location: M/R Hub
- Part time: 413 hours
- Component: Hub, Bell
- Component part number: 204012101139
- Stage of operation: NR
- How discovered: 9
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2011FA0000657

## Discrepancy

PILOT NOTED A VERTICAL VIBRATION DURING FLIGHT.  UPON VISUAL INSPECTION, IT WAS FOUND THAT MAIN ROTOR BLADE HAD CRACKED 90 INCHES FROM BLADE TIP THROUGH THE T/E TO THE SPAR AND 7" TOWARDS THE BLADE ROOT ALONG THE SPAR, ON UPPER AND LOWER SURFACES OF THE BLADE.

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