# STC SA531EA

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Pan American World Airways Inc, United States
- Description: Installation of EMCO autopilot monitoring system Model No. APMS-E. (707-121B)
- Status date: September 27, 1968
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A21](https://openairdocs.org/tcds/4A21)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7A5885AAE603139985256CC20012285C.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA531EA

## ADs that name it (0)

None.

## Approved models (1)

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

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