# STC SA7220SW-D

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: S-TEC Corporation, United States
- Description: Installation of S-TEC Manual Electric trim system, model ST-328.
- Applied: May 17, 1990
- Status date: June 8, 1990
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/6a/61/6a611463472f158d7265b320f60d0edda035332c3753729c24c5c374bdf18b0f
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/521708B6AA4AD45F85256CC20056A221.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA7220SW-D

## ADs that name it (0)

None.

## Approved models (8)

- The Cessna Aircraft Company 172D ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- The Cessna Aircraft Company 172E ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- The Cessna Aircraft Company 172F (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- The Cessna Aircraft Company 172G ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- The Cessna Aircraft Company 172H (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- The Cessna Aircraft Company 172I ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- The Cessna Aircraft Company 172K ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- The Cessna Aircraft Company 172L ([TCDS 3A12](https://openairdocs.org/tcds/3A12))

## 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.

Separtmtnt of transportation —federal Station administration Supplemental ICujje Certificate *SU4mV€*r' SA7220SW-D S-TEC Corporation Rt. 4, Bldg. 946 Wolters Industrial Complex Mineral Wells, TX 76067 '.4^.^t».*z£42^ ^^>u»^^ 3 y^ Civil Air 3A12 CESSNA -172D, 172E, 172F, 172G, 172H, 1721, 172K & 172L Installation of S-TEC Manual Electric Trim System, Model ST-328, according to Bulletin No. 428, dated 5-08-90 and Master Drawing List No. 92517, dated 5-08-90 and/or later FAA Approved revisions of the above data (14 Volt System).

1. Also eligible on the above models when modified per STC SA420CE (Lycoming Engine 0-360-A1D, 180 H.P.).

2. FAA/DAS Approved Supplemental Flight Manual, P/N 89870, dated 6-08-90 is required for Cessna Models 172D, 172E, 172F, 172G, 172H, 1721, 172K & 172L And The Above Models When Modified Per STC SA420CE (Lycoming Engine 0-360-A1D, 180 H.P.).

>ee Continuation Sheet, Page 2, a part of this STC.)

* .^^^ 5-17-90 6-08-90 (Signalurt) ^ Harold W. Holdeman DAS Staff Coordinator, DAS 5 SW (Tiilt) Any alteration of I flit certificate it punishable by a.fine of not exceeding II ,000, or imprisonment not exceeding 3 yean, or both.

TMi trrtiftatt may *» traiufcrrtd in aenrtlana witk FAR 21.17.

r*A fewi • 11 o- J (10-«i|

Wnitrd /Statts of amenta ©epartment of ^transportation— f edcral atriation administration Ctrtificatt (Continuation £heet) SA7220SW-D Limitations and Conditions (con't.)

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

'M alteration of this certificate is punishable by a fine of not exceeding Si,000, or imprisonment not exceeding 3 years, or bnlh.

AA FORM 81HX-2-I (10-69) This certificate may be tram/erred in accordance with i'AR i'/.-l?.

INSTRUCTIONS : The transfer endorsement below may be used to notify the appropriate FAA Regional Office of the transfer of this Supplemental Type Certificate.

The FAA will reissue the certificate in the name of the transferre and forward it to him.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) _ (Jfumter and strut) (City, State, andZlt code) of grantor) (Trait or type) (Address of grantor) (${um6er and street) (City, State, andZ/lf code) Exent of Authority (if licensing agreement) :

Signature of grantor (In inQ : __ _ Page 2 of 2

## Every issue (1)

- June 8, 1990: Issued, Current. [certificate](https://openairdocs.org/files/sha256/6a/61/6a611463472f158d7265b320f60d0edda035332c3753729c24c5c374bdf18b0f)

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