# STC SH7853SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: World Wide Helicopters Inc., United States
- Description: Installation of two Allison Model250-C30G engines.
- Applied: February 24, 1989
- Status date: June 11, 2007
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H9SW](https://openairdocs.org/tcds/H9SW)
- Certificate PDF: https://openairdocs.org/files/sha256/71/1a/711aa36bb0e11a2ca80c329788b75bfdcfc2b6596c4a558e3216a99a21311fd2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/40ABC969AAE5C3F3862581C4006DF081.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH7853SW

## ADs that name it (0)

None.

## Approved models (3)

- Bell Helicopter Textron (Canada) 222 ([TCDS H9SW](https://openairdocs.org/tcds/H9SW))
- Bell Helicopter Textron (Canada) 222B ([TCDS H9SW](https://openairdocs.org/tcds/H9SW))
- Bell Helicopter Textron (Canada) 222U ([TCDS H9SW](https://openairdocs.org/tcds/H9SW))

## What the certificate says

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

## Every issue (2)

- June 11, 2007: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/71/1a/711aa36bb0e11a2ca80c329788b75bfdcfc2b6596c4a558e3216a99a21311fd2)
- November 3, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/66/00/66001aede26bc27b0b0bdbb708b3cfc429ccbfef40e3644e4332654206706e73)

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