# STC SA194NW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Heath Tecna Inc., United States
- Description: Installation of new look interior arrangement. (720-047B)
- Applied: December 9, 1974
- Status date: February 17, 2005
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 4A28](https://openairdocs.org/tcds/4A28)
- Certificate PDF: https://openairdocs.org/files/sha256/f3/fc/f3fc03262fad7703eb8edf8cef20797a195bb95a5093a622e84eb0ac9f69fe2b
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/92C7AB8D2A140D25862579200044AB56.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA194NW

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 720 ([TCDS 4A28](https://openairdocs.org/tcds/4A28))

## 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.

United States of America Department of Transportation_Federal Aviation Administration Supplemental Type Certificate Number SA194NW

This certificate, issued to: Heath Tecna Inc.

3225 Woburn Street Bellingham, WA 98226

Part 4b of the Civil Air Regulations.

Original ProductType Certificate Number: 4A28 Make: Boeing Model: 720-047B

Description of the Type Design Change: Installation of “New Look” interior arrangement in accordance with Heath Tecna Drawing List HPD-DL-1, Revision C, dated January 12, 1976, or later FAA approved revision.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated, unless it is determined that the relationship between this change and any of those previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate must be maintained as part of the permanent records for the modified aircraft.

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.

Date of application: December 9, 1974 Date reissued: 8/28/90; 6/1/96; 7/20/00;

2/17/05

Date of issuance: June 30, 1975 Date amended: 10/31/75; 8/28/90

(Signature) Acting Manager, Seattle Aircraft Certification Office (Title)

## Every issue (1)

- February 17, 2005: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/f3/fc/f3fc03262fad7703eb8edf8cef20797a195bb95a5093a622e84eb0ac9f69fe2b)

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