# STC SA781SO

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: Pemco Aeroplex Inc, United States
- Description: Installation of a cargo loading door. (707-227)
- Applied: May 2, 1980
- Status date: August 4, 2009
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A21](https://openairdocs.org/tcds/4A21)
- Certificate PDF: https://openairdocs.org/files/sha256/8d/ed/8ded20041d2f28e821069fc5895c2b915e221792959c8b284db6707f9b157b9a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4FEC2B283680D0A4862577420073C15E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA781SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 707 ([TCDS 4A21](https://openairdocs.org/tcds/4A21))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- August 4, 2009: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/8d/ed/8ded20041d2f28e821069fc5895c2b915e221792959c8b284db6707f9b157b9a)

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From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.