# STC SR00144DE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Midwest Aerospace TC LLC, United States
- Description: Installation of an upgraded 42 degree tail rotor gearbox.
- Applied: November 8, 1993
- Status date: February 8, 2023
- Product: Aircraft, Rotorcraft
- Data sheets: [TCDS H1SW](https://openairdocs.org/tcds/H1SW)
- Certificate PDF: https://openairdocs.org/files/sha256/e2/7a/e27afc9f836728ddf07d53cde57df91ec1634ece148261828de5dc8a898c9f80
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID162246421020230703135349.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SR00144DE

## ADs that name it (0)

None.

## Approved models (1)

- Bell Helicopter Textron Inc. 204B ([TCDS H1SW](https://openairdocs.org/tcds/H1SW))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

FAA Form 8110-2 (03/21) SR00144DE Midwest Aerospace TC LLC 9465 Joliet Street St. John, IN 46373 7 the Civil Air Regulations H1SW Bell 204B Installation of an upgraded 42 degree Tail Rotor gearbox, P/N 212-040-003 in accordance with Garlick Helicopters, Inc. Drawing GUI-94200, Revision A, dated August 11, 1994, or later FAA approved revision.

November 8, 1993 July 10, 2007; Februray 2, 2009; February 8, 2023 February 1, 1995 January 26, 2012 for Manager, West Certification Branch

1. Compatibility of this design change this design change with previously approved modifications must be determined by the installer.

2. 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.

3. Garlick Helicopters Rotorcraft Maintenance Manual Supplement for the 204B model is required for this STC. Airworthiness Limitations FAA approved February 1, 1995, or later FAA approved revision is required.

4. A copy of this Certificate, Eligibility List, Flight Manual Supplement, and Maintenance Manual Supplement must be maintained as part of the permanent records of the modified aircraft.

FAA Form 8110-2 (03/21) SR00144DE

## Every issue (3)

- February 8, 2023: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/e2/7a/e27afc9f836728ddf07d53cde57df91ec1634ece148261828de5dc8a898c9f80)
- February 2, 2009: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/71/94/71944e1ee38009eeefa7b7e27bd28fd1c5088628e3843430cf6077f952080e43)
- July 10, 2007: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/3b/4f/3b4f99d24b669ffd2a9c71f06e0ce2a92c21bec647dea9276bba507301fd3592)

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