# STC SH2685SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Petroleum Helicopters Inc.
- Description: Installation of Detroit Diesel Allison Model 250C-20B; or 250C-20J engine derated thermally and mechanically to the power envelope approved for Bell 206B
- Status date: January 4, 1983
- Data sheets: H2SW
- Certificate PDF: https://openairdocs.org/files/sha256/9f/b4/9fb41007a36e5605bb3d96db50738b8d62e53943151d3978b0ffdf3b0f83d237
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID181797114420250923132752.0001
- Page: https://openairdocs.org/stc/SH2685SW

## ADs that name it

None.

## Approved models (1)

- Bell Textron Canada Limited 206B (TCDS H2SW)

## What the certificate says

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

## Every issue (1)

- January 4, 1983: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/9f/b4/9fb41007a36e5605bb3d96db50738b8d62e53943151d3978b0ffdf3b0f83d237)

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From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.