# STC SA681NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Ehlers, William B., United States
- Description: Installation of the EDO-AIRE MITCHELL CENTURY III-Model AK 206 automatic pilot with radio and glideslope coupler and automatic trim
- Applied: September 5, 1978
- Status date: October 19, 1978
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A15](https://openairdocs.org/tcds/3A15)
- Certificate PDF: https://openairdocs.org/files/sha256/f8/a3/f8a3752d22c3cef53222e97e4dc89229de5d5171a9988822255b2c40204f3543
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/954DCDAF4ED2ECC586257A41006C97DD.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA681NW

## ADs that name it (0)

None.

## Approved models (1)

- Hawker Beechcraft Corporation M35 ([TCDS 3A15](https://openairdocs.org/tcds/3A15))

## What the certificate says

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

## Every issue (1)

- October 19, 1978: Issued, Current. [certificate](https://openairdocs.org/files/sha256/f8/a3/f8a3752d22c3cef53222e97e4dc89229de5d5171a9988822255b2c40204f3543)

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