# SDR AC2A2020041013901

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 10, 2020
- Submitted: April 10, 2020
- Operation: Air carrier
- Aircraft: [N639GG](https://openairdocs.org/aircraft/N639GG), registered now
- Make and model: Agusta AW139
- Registry model: [Agusta AW139](https://openairdocs.org/model/agustawestland-philadelphia-aw139) (OpenAirDocs)
- Aircraft serial: 41308
- Aircraft time: 5,866 hours, 10,575 cycles
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Intermed Gearbox
- Part number: 3G6521A00232
- Part serial: HCA3715
- Condition: Worn
- Location: Tail Rotor
- Part time: 599 hours, 782 cycles
- 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/AC2A2020041013901

## Discrepancy

INTERMEDIATE GEARBOX (IGB) INPUT FLANGE P/N 3G6521A00232 S/N HCA3715 WAS WORN SPLINES TO LIMITS.

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