# SDR AC2A201807109201

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 2018
- Submitted: July 10, 2018
- Operation: Air carrier
- Aircraft: [N392JS](https://openairdocs.org/aircraft/N392JS), registered now
- Make and model: Skrsky S92A
- Aircraft serial: 90249
- Aircraft time: 3,359 hours, 1,375 cycles
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Gearbox
- Part number: 9235115100047
- Part serial: A17300279
- Condition: Cracked
- Location: Main Rotor
- Part time: 3,359 hours
- 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/AC2A201807109201

## Discrepancy

DURING THE 375 HOUR REPLACEMENT OF THE MGB LUBE PUMP VESPEL SPLINE ADAPTER ON THE NR 2 SIDE, THE UPPER STUD WAS BROKEN. AFTER FURTHER INVESTIGATION OF THE R/H MGB LUBE PUMP UPPER STUD AREA WE DISCOVERED CRACKING OF THE CASE AROUND THE BASE OF THE STUDS

---
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.