# SDR 20000511SH040

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 24, 2000
- Submitted: May 11, 2000
- Operation: General aviation
- Aircraft: [N158AC](https://openairdocs.org/aircraft/N158AC), registered now
- Make and model: Skrsky S64F
- Aircraft serial: 64081
- Aircraft time: 9,278 hours
- System (JASC): [6320 · Main Rotor Gearbox](https://openairdocs.org/jasc/6320)
- Part: Planetary Gear
- Part number: 643520411102
- Part serial: 1477
- Condition: Fractured
- Location: Main Gearbox
- Component: Main Gearbox, Skrsky
- Component part number: 643520500048
- 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/20000511SH040

## Discrepancy

1ST STAGE PLANETARY PINION GEAR, PN 6435-20411-102, SN 1477, HAVING AN UNKNOWN TT, FAILED IN MAIN GEARBOX, PN 6435-20500-048, SN A6-161.  INSP REVEALED TWO-THIRDS OF A 1ST STAGE PLANETARY PINION GEAR TOOTH FRACTURED CAUSING REPLACMENT OF THE FOLLOWING ITEMS DUE TO SECONDARY DAMAGE:  18 EACH 2ND STAGE PLANETARY PINION GEARS, PN 6435-20057-012, RING GEAR, PN 6435-20165-012, 1ST STAGE SUN GEAR, PN 6435-20412-102, 2ND STAGE SUN GEAR, PN 6435-20414-101, AND 6 EACH 1ST STAGE PLANETARY PINION GEARS REPLACED.  (X)

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