# STC SA111RM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Heliarc Welding Service Inc., United States
- Description: Modify exhaust stacks by installing straight slip joint.
- Applied: October 26, 1977
- Status date: March 27, 1978
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 6A1](https://openairdocs.org/tcds/6A1)
- Certificate PDF: https://openairdocs.org/files/sha256/d7/26/d72641409f045b0280dbbd8df77f1ec1295e5736cd65d12e0aa36e33da4e0400
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CA25E7908743AB8585256CC10080DE52.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA111RM

## ADs that name it (0)

None.

## Approved models (1)

- Twin Commander Aircraft LLC 500-B ([TCDS 6A1](https://openairdocs.org/tcds/6A1))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- March 27, 1978: Issued, Current. [certificate](https://openairdocs.org/files/sha256/d7/26/d72641409f045b0280dbbd8df77f1ec1295e5736cd65d12e0aa36e33da4e0400)

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