# STC SA8404SW-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC System 55/55X two axis automatic flight guidance system Model ST-550
- Applied: August 6, 1994
- Status date: March 16, 2001
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A16](https://openairdocs.org/tcds/3A16)
- Certificate PDF: https://openairdocs.org/files/sha256/a3/74/a3743e20f36dcc0e792bb7e90e427f1b18251fb0dd72e641a120669514815deb
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7920760754CDDEA285256CC20058E794.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA8404SW-D

## ADs that name it (0)

None.

## Approved models (2)

- Raytheon Aircraft Company 58 ([TCDS 3A16](https://openairdocs.org/tcds/3A16))
- Raytheon Aircraft Company 58A ([TCDS 3A16](https://openairdocs.org/tcds/3A16))

## 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.

Jftmtctr plates ©f J\mcrica Bcparimcni of tlransportatton - Jjchcral Abtatum JX.hmtmstralirm (Eerttficaie SA8404SW-D S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 //Sff//dr r/ts/jtar Ss/ //re /'jrfr «6'Jffftt /fJi /dr/fjtffjnwttf/f/fif^/r/ftwy/t ///r faMf/a/fti/i^ (fjtf/ f M y/ccfj6fY/ //fH<<u/ u/cfA /dr a/Mtoi/dfMtzu Hwf/fH'atmA fy'^ff)/ ,/ 3A16 Beech 58 and 58A Installation of S-TEC System 55/55X Two Axis Automatic Flight Guidance System, Model ST-550, according to Bulletin No. 650, Revision I, dated 3-16-01 and Master Drawing List No. 92703, Revision A, dated 3-16-01 or later FAA Approved revisions of the above data (28 Volt System).

(See Continuation Sheet, Page 2, a part of this STC.)

If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

fs/r ff/>f/f//f M//<ftfj>/<r/ty at?/// frr/tff-d t) /dr ^fsMt/vi> e

•OM.- 8-06-94 8-08-94 &„/<>«,*«„</«/.• 3-16-01 (Signature) Michael Keirnan DAS Staff Coordinator. DAS 5 SW (Title)

JSlnitcb ^tatcs ©f America department of tCransportatinn - jTcbcral ,Afriaii«™ JX.hmimsiraitrm (Eerttftcaie SA8404SW-D Limitations and Conditions (con't.)

1. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891091, dated 8-08-94 is required or later FAA Approved revisions of the above supplement.

2. FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 891091, Revision 1, dated 3-16-01 is required for Beech models 58 and 58A for S-TEC System 55/55X or later FAA Approved revisions of the above supplement.

3. Compatibility of this modification with other previously approved modifications must be determined by the installer.

FAA Form 8110-2-1(10-69) Page 2 of 2

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, Stale, and ^IP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and £IP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink):

## Every issue (1)

- March 16, 2001: Amended, Current. [certificate](https://openairdocs.org/files/sha256/a3/74/a3743e20f36dcc0e792bb7e90e427f1b18251fb0dd72e641a120669514815deb)

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