# STC SA1611SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Century Flight Systems Inc, United States
- Description: Installation of Mitchell automatic flight system AK413 consisting of altimatic IIIB-1 with optional automatic pitch trim, radio coupler, and glide slope coupler
- Applied: February 15, 1973
- Status date: July 16, 1984
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A8EA](https://openairdocs.org/tcds/A8EA)
- Certificate PDF: https://openairdocs.org/files/sha256/c8/36/c836ef6417433e5373c27919efedd504219315f5996edd926b53ccb974b6ba4a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9A4A931204520AEC85256CC10082145F.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA1611SW

## ADs that name it (0)

None.

## Approved models (1)

- Piper Aircraft Inc. PA-31P-350 ([TCDS A8EA](https://openairdocs.org/tcds/A8EA))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

department of transportation federal 3oiation administration Supplemental t:uje Certificate SA1611SW Utfd tsl&au4a/tj>nA Century Flight Systems, Inc.

F.M. 1195 P. 0. Box 610 Mineral Wells, TX 76067 A8EA Piper PA-31-350 Civil Air rua#; Ins-tallation of Mitchell Automatic Flight System Model AK413 consisting of Altimatic I1IB-1 with optional Automatic Pitch Trim, Radio Coupler, and Glide Slope Coupler according to Bulletin No. 536, Revision

(3), dated 4-29-74 and Master Drawing List No. 87A649, Revision B, dated 2-27-73.

Installation of Mitchell Radio Coupler Model 1C388-3 according to Bulletin No. 611, Revision (1), dated 4-16-74, and Master Drawing List 87A708, Revision A, dated 4-16-74.

FAA Approved Airplane Flight Manual Supplement dated February 28, 1973, is required, FAA Approved Airplane Flight Manual Supplement P/N 68S167 dated April 16, 1974, is required for Mitchell Radio Coupler Model 1C388-3.

February 15, 1973 February 28, 1973 4-16-74, 7-16-84, Revision 2 )on P. Watson Manager, Aircraft Certification Division Southwest Region (Title)

7his certificate may bt tiansferrtd in aeta'dance with f-AR 21.17.

TRANSFER ENDORSEMENT Transfer [he ownership of Supplemental Type Certificate Number .

to (Name of transferee) (Address of transferee) (Numbtr and streftj ICitf, Slau. and ZIP mdij from (Name of grantor) (Print or type) (Address of grantor) (Number and itrrff) , Stall, a Extent of Authority (if licensing agreement):

Dale of Transfer:.

Signature of grantor (In ink):

**C FAA AC 69-5536**

## Every issue (1)

- July 16, 1984: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/c8/36/c836ef6417433e5373c27919efedd504219315f5996edd926b53ccb974b6ba4a)

---
From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.