# SDR AC2A2021051713901

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2021
- Submitted: May 17, 2021
- Operation: Air carrier
- Aircraft: [N139FW](https://openairdocs.org/aircraft/N139FW), registered now
- Make and model: Agusta AB139
- Registry model: [Agusta AB139](https://openairdocs.org/model/agusta-ab139) (OpenAirDocs)
- Aircraft serial: 31022
- Aircraft time: 7,774 hours, 15,665 cycles
- System (JASC): [6520 · Tail Rotor Gearbox](https://openairdocs.org/jasc/6520)
- Part: Adapter
- Part number: 3G6320A16551
- Part serial: DAT197
- Condition: Worn
- Location: T/R Gearbox
- Part time: 897 hours, 1,235 cycles
- Component: Gearbox, Agusta
- Component part number: 3G6303P01011
- 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/AC2A2021051713901

## Discrepancy

CLAMPED ADAPTER P/N 3G6320A16551, S/N DAT197 AND ADAPTER CLAMPS P/N 3G6320A16661, S/N AVI 0406 WERE REMOVED FROM MGB 3G6320A001434, S/N V44 IN PREPARATION FOR SHIPMENT OF MGB IN FOR OVERHAUL.  ADAPTER AND CLAMPS DISPLAY EVIDENCE OF SIGNIFICANT WEAR OF 0.010" ON MATTING SURFACES.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.