# STC SA750NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Heath Tecna Inc., United States - Description: Installation of Mark I interior retrofit kit. - Applied: June 5, 1978 - Status date: February 17, 2005 - Product: Aircraft, Large Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS 4A25](https://openairdocs.org/tcds/4A25) - Certificate PDF: https://openairdocs.org/files/sha256/59/5f/595fae851fb73f239db87e3415fd933b0d5f92c22cd67117807dac587704d2de - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5A2D3A3A9ADD22F7862579200046C5A8.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA750NW ## ADs that name it (0) None. ## Approved models (2) - McDonnell Douglas Corporation DC-8-61 ([TCDS 4A25](https://openairdocs.org/tcds/4A25)) - McDonnell Douglas Corporation DC-8-63 ([TCDS 4A25](https://openairdocs.org/tcds/4A25)) ## 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 SA750NW 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: 4A25 Make: McDonnell Douglas Model: DC-8-63, DC-8-61 Description of the Type Design Change : Installation of a Mark I Interior Retrofit Kit in accordance with Heath Tecna Corporation Drawing List No. HPD-DL-6, Revision C, dated April 18, 1980, or later FAA approved revisions. 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 other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. The resulting interior arrangement, along with the required placarding, has not been evaluated and is not part of this STC. A copy of this Certificate shall 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 evidence of that permission. Date of application: June 5, 1978 Date reissued: 8/28/90; 6/1/96; 7/20/00; 2/17/05 Date of issuance: April 12, 1979 Date amended: July 20, 2000 (Signature) Acting Manager, Seattle Aircraft Certification Office (Title) ## Every issue (1) - February 17, 2005: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/59/5f/595fae851fb73f239db87e3415fd933b0d5f92c22cd67117807dac587704d2de) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.