# STC SA70SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: National Airlines Inc, United States
- Description: Deactivation of center wing and forward auxiliary fuel tanks.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4047C7E09664EFCC862570D20071CD9B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA70SO

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-8 Series ([TCDS 4A25](https://openairdocs.org/tcds/4A25))

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