# STC SA1321NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Transamerica Airlines, United States
- Description: Modification of the Public Address System to include microphones at each floor level exit in compliance with FAR 121.318(b)(2).
- Applied: June 30, 1980
- Status date: January 14, 1982
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 121
- Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3873090F6382426886256D4700470983.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1321NM

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-8-63F ([TCDS 4A25](https://openairdocs.org/tcds/4A25))

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