# SDR CA190423001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 14, 2019
- Submitted: August 17, 2020
- Operation: General aviation
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft time: 14,198 hours
- System (JASC): [2780 · Leading Edge Slat Control System](https://openairdocs.org/jasc/2780)
- Part: Pinion
- Part number: P684A610100
- Condition: Corroded
- Location: Slats
- 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/CA190423001

## Discrepancy

(CAN) FOUND DURING C-02 CHK, PITTING CORROSION WAS FOUND ON SLAT #7 I/B PINION GEAR ROLLER ASSEMBLY. THE NOTED PITTING IS COMMON TO ALL THE GEAR TEETH AND THE ENTIRE CIRCUMFERENCE OF THE DISCREPANT PINON GEAR OUTER RACES. THE CURRENT PITTING DEPTH EXCEEDS THE 0.010  MAX PITTING DEPTH LIMIT AS PER REF/A/STEP C.(B)2)D). (TC# 20190423001)

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