# STC SA1515NM

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Heliarc Welding Service Inc., United States
- Description: Crossover exhaust pipe assembly.
- Applied: June 25, 1981
- Status date: November 4, 1982
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A7CE](https://openairdocs.org/tcds/A7CE)
- Certificate PDF: https://openairdocs.org/files/sha256/0b/4a/0b4a0545990e5af1dd5f967a95786e25ebd0752bfe76f202e947f02d0cb411af
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FBB29B94BE02C22485256CC10082126B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1515NM

## ADs that name it (0)

None.

## Approved models (5)

- Cessna Aircraft Company 411 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 411A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421 ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421A ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))
- Cessna Aircraft Company 421B ([TCDS A7CE](https://openairdocs.org/tcds/A7CE))

## 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 4%%en-s Number: SA1515 NM This certificate issued to: Heliarc Welding Service, Inc.

3965 Newport Street, P. O. Box 38509 Denver, Colorado 80238 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meets the airvorthiness requirement's of Part 3 of the CIVIT Air Regulations.

Original Product -Type bentificate Numben: ATCE Make: Cessna Model: 411, 411A, 421, 421A and 421B Description of Type Design Change: Crossover exhaust pipe assembly in accordance with Heliarc Welding Service, Inc. Drawing Numbers HWS-42121-20/22 and ANS- 42121-40/42, dated November 30, 1979, or later revision.

This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of the aircraft.

Date of Application: June 25, 1981 Date Reissued:

Date of Issuance: . September 22, 1982 Jale unended: November 4, 1982 FEDERAL AVIATION By Direction of the Administrator hark :. Buldwin MARK E. BALDWIN, (Signature) Manager TAMINISTRAIO Denver Aircraft Certification Field Office Northwest Mountain Region, Aurora, Colorado (Title)

47.

## Every issue (1)

- November 4, 1982: Amended, Current. [certificate](https://openairdocs.org/files/sha256/0b/4a/0b4a0545990e5af1dd5f967a95786e25ebd0752bfe76f202e947f02d0cb411af)

---
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.