# SDR 9EKA20210602

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 29, 2021
- Submitted: June 2, 2021
- Operation: Air carrier
- Aircraft: [N823H](https://openairdocs.org/aircraft/N823H), registered now
- Make and model: Bell 214ST
- Registry model: [Bell 214ST](https://openairdocs.org/model/bell-214st) (OpenAirDocs)
- Aircraft serial: 28141
- Aircraft time: 11,836 hours
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Nut
- Condition: Loose
- Location: Transmission
- Part time: 11,914 hours
- Component: Transmission, Bell, 9DKA20210530
- Component part number: 214040002115
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9EKA20210602

## Discrepancy

DURING ROUTINE MAINTENANCE IT WAS DISCOVERED THAT FRETTING WAS OCCURRING BETWEEN THE RING GEAR CASE AND THE UPPER CASE OF MAIN GEAR BOX.  C/W TORQUE CHECK OF STUDS AND FOUND NUTS HAVE LOST TORQUE.

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