# SDR CYX2002F00002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 22, 2002
- Submitted: September 10, 2002
- Operation: Air carrier
- Aircraft: [N407LG](https://openairdocs.org/aircraft/N407LG), registered now
- Make and model: Bell 407
- Registry model: [Bell 407](https://openairdocs.org/model/bell-helicopter-textron-canada-407) (OpenAirDocs)
- Aircraft serial: 53143
- System (JASC): [6340 · Rotor Drive Indicating System](https://openairdocs.org/jasc/6340)
- Part: Sensor
- Part number: 407375021103
- Part serial: 970028
- Condition: Faulty
- Location: Rotor Rpm
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CYX2002F00002

## Discrepancy

ROTOR RPM ANNUNCIATOR LIGHT CAME ON AND STAYED ON IN FLIGHT.  ROTOR RPM WAS IN THE NORMAL RANGE.  INSTALLED A NEW ROTOR RPM SENSOR SWITCH AND SYSTEM OPERATED NORMALLY.  CAUSE OF FAILURE UNKNOWN.

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