# STC SA8121SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: ZEE Systems Inc.
- Description: Installation of freon air conditioner
- Status date: February 14, 2012
- Data sheets: A17SW, A17SW, A17SW
- Certificate PDF: https://openairdocs.org/files/sha256/73/c8/73c819b254571c94b7618664d462af143c92dd2eeba4fe98295147bb37e372df
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AC8FBAE50B70B34B862579CD006076C2.0001
- Page: https://openairdocs.org/stc/SA8121SW

## ADs that name it

None.

## Approved models (3)

- Air Tractor Inc. AT-502 (TCDS A17SW)
- Air Tractor Inc. AT-502A (TCDS A17SW)
- Air Tractor Inc. AT-502B (TCDS A17SW)

## 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.

Part 21.25 of the Federal Aviation Regulations.

Installation of freon air conditioner on Air Tractor Models AT-502, AT-502A, and AT-502B in accordance with Lane Aviation, Inc., drawing list 50-000, dated 5/17/90 revised 10/10/91 or later FAA approved revision.

The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

ZEE Systems, Inc.

406 W. Rhapsody San Antonio, TX 78216 A17SW Make : Air Tractor Model : AT-502, AT-502A, AT-502B Date of application : May 16, 1990

Date of issuance : October 18, 1991

Date reissued : February 14, 2012

Date amended : July 07, 1994 Revision 3

( Signature) M. Monica Merritt, Manager, Airplane Certification Office, Southwest Region

( Title)

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

## Every issue (1)

- February 14, 2012: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/73/c8/73c819b254571c94b7618664d462af143c92dd2eeba4fe98295147bb37e372df)

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