# STC ST712SO-D

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Pan American World Airways Inc, United States
- Description: Modification and installation of a Hardman Model 6747 seat. (707-321C, -321, -331, -321B)
- Status date: September 11, 1978
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A26](https://openairdocs.org/tcds/4A26)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A353D1A721D2D0F385256CC3000360E0.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST712SO-D

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 707 ([TCDS 4A26](https://openairdocs.org/tcds/4A26))

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