# STC SR00073DE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Midwest Aerospace TC LLC, United States
- Description: Replacement of Lycoming T53-L-13 series powerplant
- Applied: August 11, 1993
- Status date: February 8, 2023
- Product: Aircraft, Rotorcraft
- Certification basis: Part 29
- Data sheets: [TCDS H3NM](https://openairdocs.org/tcds/H3NM), [TCDS H13WE](https://openairdocs.org/tcds/H13WE), [TCDS H1RM](https://openairdocs.org/tcds/H1RM), [TCDS H5SO](https://openairdocs.org/tcds/H5SO), [TCDS H7SO](https://openairdocs.org/tcds/H7SO), [TCDS H3SO](https://openairdocs.org/tcds/H3SO)
- Certificate PDF: https://openairdocs.org/files/sha256/3c/78/3c783e62b00b56972977d14fb6dc576bea7cdcc0ce49b6bdd98a8a9ea87cf479
- Approved model list and other attachments: [SR00073DE_AML.pdf](https://openairdocs.org/files/sha256/c9/e3/c9e3eacde4277f7effe69d0e3aa9845eafac37fcf39120b94397b8539596c495)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID115278605820230605143045.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SR00073DE

## ADs that name it (0)

None.

## Approved models (6)

- Garlick Helicopters Inc. UH-1B ([TCDS H13WE](https://openairdocs.org/tcds/H13WE))
- Garlick Helicopters Inc. UH-1B ([TCDS H3NM](https://openairdocs.org/tcds/H3NM))
- Hawkins & Powers Aviation Inc. UH-1B ([TCDS H1RM](https://openairdocs.org/tcds/H1RM))
- International Helicopters Inc. UH-1B ([TCDS H5SO](https://openairdocs.org/tcds/H5SO))
- Richards Heavylift Helo Inc. UH-1B ([TCDS H3SO](https://openairdocs.org/tcds/H3SO))
- Williams Helicopter Corporation UH-1B ([TCDS H7SO](https://openairdocs.org/tcds/H7SO))

## 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.

(See Continuation Sheet Page 3 of 3 Pages) FAA Form 8110-2 (03/21) SR00073DE Midwest Aerospace TC LLC 9465 Joliet Street St. John, IN 46373 29 the Federal Aviation Regulations * * See attached FAA Approved Model List (AML) No. SR00073DE for a list of approved rotorcraft models and applicable airworthiness regulations.

Replacement of Lycoming T53-L-13 series powerplant in accordance with Garlick Helicopters, Inc. Installation Instructions Report GHI-UH1-013, FAA approved January 11, 1994, or later FAA approved revision.

August 11, 1993 July 10, 2007; February 2, 2009; February 8, 2023 January 11, 1994 May 24, 2002; January 26, 2012 for Manager, West Certification Branch *

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

FAA Form 8110-2 (03/21) SR00073DE

End FAA Form 8110-2 (03/21) Limitations and Conditions (Continued):

SR00073DE

4. Garlick Helicopters Rotorcraft Flight Manual Supplement for the UH-1B with Lycoming T53-L-13 installed, FAA approved January 11, 1994, or later FAA approved revision is required.

5. Garlick Helicopters Rotorcraft Maintenance Manual Supplement with Lycoming T53-L-13 installed is required for this STC.

6. Garlick Helicopters Rotorcraft Installation Instructions Report GHI-UH1-013 is required for the STC.

7. Compatibility with STC SR00026DE for installation of the 24" tail boom extension has been demonstrated, but is not required for this modification to the UH-1B (Restricted Category).

8. Aircraft modified by this STC are limited for use per 14 CFR 21.93(b)(4) to:

a. Agricultural aircraft operations as defined in 14 CFR 137.3, effective January 1, 1996, and for for dispensing of Fire Fighting Materials.

b. External Load Operations. Carrying in External Loads as defined in 14 CFR 133. (b) effective December 20, 1976.

### SR00073DE_AML.pdf

FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SR00073DE FOR Conversion of UH-1B Helicopter to Lycoming T53-L-13 Series Engine UH-1B Helicopters Eligible for Civil Certification Under one of the following Type Certificates are Eligible for Conversion to the T53-L-13 Series Engine Under this Supplement Type Certificate.

ISSUE DATE: January 11, 1994 Page 1 of 1 ITEM Type Certificate Holder ROTORCRAFT MODEL

**ORIGINAL**

**TC NUMBER**

1. Garlick Helicopters UH-1B H3NM

2. Garlick Helicopters UH-1B H13WE

3. Hawkins & Powers UH-1B H1RM

4. International Helicopters, Inc. UH-1B H5SO

5. Southern Aero Corp UH-1B H3SO

6. Williams Helicopter Corp UH-1B H7SO Installation to be per Garlick Helicopters, Inc.

Installation Instructions No. GHI-UH1-013 FAA Approved:

for Manager, West Certification Branch AMENDED: May 24, 2002; January 26, 2012 REISSUED: July 10, 2007; February 2, 2009; February 8, 2023

## Every issue (3)

- February 8, 2023: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3c/78/3c783e62b00b56972977d14fb6dc576bea7cdcc0ce49b6bdd98a8a9ea87cf479), [SR00073DE_AML.pdf](https://openairdocs.org/files/sha256/c9/e3/c9e3eacde4277f7effe69d0e3aa9845eafac37fcf39120b94397b8539596c495)
- February 2, 2009: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/ec/c2/ecc2c353d75b45bacff0a8f18edc98e16c38b9c2e958e745efe5e656eb28f369), [STC SR00073DE.pdf](https://openairdocs.org/files/sha256/bc/78/bc7822027f81a492e8b3d9a634ba6ebf2a2d2ebccefc5b8e12291673f6504b0d)
- July 10, 2007: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/a1/9a/a19a1b470d43aa6c3192b0ee0382fe1d1346c7d3d55f49d419b8a138790dc1ab)

---
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.