# STC SA4-84

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: Alaska Airlines Inc, United States
- Description: Fiber gasket 4233666 in cowl flap actuating cylinder replaced with AN 6227-20 O ring.
- Status date: October 5, 2009
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-762](https://openairdocs.org/tcds/A-762)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7B2FF2DBB4A3C2A4862576480045CD95.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4-84

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-4 ([TCDS A-762](https://openairdocs.org/tcds/A-762))

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