# SDR CHIR201610262623

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 25, 2016
- Submitted: October 26, 2016
- Operation: General aviation
- Aircraft: [N238CH](https://openairdocs.org/aircraft/N238CH), registered now
- Make and model: Boeing 234
- Registry model: [Boeing 234](https://openairdocs.org/model/boeing-vertol-234) (OpenAirDocs)
- Aircraft serial: MJ005
- Aircraft time: 37,938 hours
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Sun Gear
- Part number: 234D22501
- Part serial: M328
- Condition: Damaged
- Location: Transmission
- Component: Transmission, Boeing
- Component part number: 234D22004
- 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/CHIR201610262623

## Discrepancy

AFTER REMOVAL, DISASSEMBLY, AND CLEANING OF FIRST STAGE SUNGEAR OUT OF THE AFT TRANSMISSION THAT WAS REMOVED FOR HIGH SOAPS, VISUAL INSPECTION REVEALED A SIZABLE CHUNK MISSING FROM THE DRIVE SIDE OF A GEAR TOOTH.  EVIDENCE OF MISSING MATERIAL HAS NOT BEEN THUS FAR FOUND ON CHIP PLUG OR IN REMAINING TRANSMISSION.

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