# STC ST707SO-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Pan American World Airways, Inc., United States
- Description: Modified aircraft to incorporate Emerson engine performance monitoring system, aircraft S/N 19363, N428PA. (707-321B)
- Status date: October 10, 1969
- 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/C60E6E1F605F6CDA85256CC3000360DA.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST707SO-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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