# STC SA4976NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: Machen Inc, United States - Description: Installation of exhaust system tailpipe redesign. - Applied: February 12, 1990 - Status date: November 1, 1998 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS A17WE](https://openairdocs.org/tcds/A17WE) - Certificate PDF: https://openairdocs.org/files/sha256/13/5e/135eee7c9c3f639467e7099330c08d3732dffea650a51ab24cbd7478109a3fd1 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E9205AEF759B4ABB85256CC2000E4012.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA4976NM ## ADs that name it (1) - [AD 2023-09-09](https://openairdocs.org/ad/2023-09-09): Exhaust Turbine System (Recip) ยท Aerostar PA-60-600 (Aerostar 600), PA-60-601 (Aerostar 601), PA-60-601P (Aerostar 601P) and 292 more. Effective Jul 17, 2023. Named in the applicability ## Approved models (5) - Aerostar Aircraft Corporation PA-60-600 (Aerostar 600) ([TCDS A17WE](https://openairdocs.org/tcds/A17WE)) - Aerostar Aircraft Corporation PA-60-601 (Aerostar 601) ([TCDS A17WE](https://openairdocs.org/tcds/A17WE)) - Aerostar Aircraft Corporation PA-60-601P (Aerostar 601P) ([TCDS A17WE](https://openairdocs.org/tcds/A17WE)) - Aerostar Aircraft Corporation PA-60-602P (Aerostar 602P) ([TCDS A17WE](https://openairdocs.org/tcds/A17WE)) - Aerostar Aircraft Corporation PA-60-700P (Aerostar 700P) ([TCDS A17WE](https://openairdocs.org/tcds/A17WE)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA4976NM This certificate issued to: Machen, Inc. 10555 Airport Drive Coeur d'Alene Airport Hayden Lake, ID 83835 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meets the airworthiness requirement's of Part 23 of the Federal Aviation Regulations. Original Product Type Certificate Number: A17WE Make: Aerostar Model: PA-60-600, -601, -601P, -602P, -700P Description of Type Design Change: Installation of an exhaust system tailpipe redesign, in accordance with Machen, Inc., Model 57 Top Drawing List, dated July 11, 1990, and Report Numer 57-1 Installation Instructions, Rev. B, dated August 8, 1990, 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 aircraft of these models 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, 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: February 12, 1990 Date Reissued: Date of Issuance: September 6, 1990 Date Amended: November 1, 1998 EDERAL AVIATION m of trator Revease aarm (Signature) HOMINIST RATION Acting Manager, Seattle Aircraft Certification Office (le) ## Every issue (1) - November 1, 1998: Amended, Current. [certificate](https://openairdocs.org/files/sha256/13/5e/135eee7c9c3f639467e7099330c08d3732dffea650a51ab24cbd7478109a3fd1) --- 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.