# STC SA638SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Modern Air Transport Inc, United States
- Description: Modification of interior to accommodate 139 passengers.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A30](https://openairdocs.org/tcds/4A30)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/957406B6A8B7CAD5862570D2004FF852.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA638SO

## ADs that name it (0)

None.

## Approved models (1)

- General Dynamics Corporation 30A ([TCDS 4A30](https://openairdocs.org/tcds/4A30))

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