# STC ST499SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: WC Corporation, United States
- Description: Modification of main landing gear brake stud.
- Status date: April 19, 1972
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/07A87A989E7D546985256CC30003604F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST499SO

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-9-30 Series ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

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