# STC SA684SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Rockwell Collins Inc, United States
- Description: Instalation of Collins AP-103F/FD-108 automatic flight control system.
- Applied: April 26, 1966
- Status date: April 24, 2000
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/11/bc/11bcb7031932ca5907365d330acbf992c5d48146b054df8016eddd74d20aa56c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/041B467743D0E53485256CC20056A036.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA684SW

## ADs that name it (0)

None.

## Approved models (4)

- Twin Commander Aircraft Corporation 680T ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680V ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 680W ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 681 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## What the certificate says

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

## Every issue (1)

- April 24, 2000: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/11/bc/11bcb7031932ca5907365d330acbf992c5d48146b054df8016eddd74d20aa56c)

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