# SDR ALG2005F00061

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 2005
- Submitted: September 13, 2005
- Operation: Air carrier
- Aircraft: [N537AL](https://openairdocs.org/aircraft/N537AL), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53230
- Engine: Allsn 250C47B
- System (JASC): [6220 · Main Rotor Head](https://openairdocs.org/jasc/6220)
- Part: Spring
- Part number: 407310104105
- Condition: Failed
- Location: Frahm
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ALG2005F00061

## Discrepancy

AIRCRAFT DEVELOPED A VERTICAL VIBRATION IN FLIGHT.  NOTIFIED MAINTENANCE.  FRAHM DAMPER SPRING HAD FAILED.  REMOVED AND INSTALLED FOUR NEW FRAHM DAMPER SPRINGS IAW MM.  (K)

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