# SDR AC2A2023062213901

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 18, 2023
- Submitted: June 22, 2023
- Operation: Air carrier
- Aircraft: [N639MM](https://openairdocs.org/aircraft/N639MM), registered now
- Make and model: Agusta AW139
- Registry model: [Agusta AW139](https://openairdocs.org/model/agustawestland-philadelphia-aw139) (OpenAirDocs)
- Aircraft serial: 41216
- Aircraft time: 9,722 hours, 17,682 cycles
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Actuator
- Part number: 3G6352V02452
- Part serial: 2079
- Condition: Unserviceable
- Location: Rotor Brake
- Part time: 20 hours, 24 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AC2A2023062213901

## Discrepancy

ROTOR BRAKE FAIL CAS ILLUMINATED ON SHUT DOWN WITH CALIPER INDICATING DOWN POSITION. REPLACED ROTOR BRAKE ACTUATOR.

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