# STC SR01534SE

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Croman Corporation, United States
- Description: Installation of the transmission input modification to the main gear box
- Applied: September 13, 2004
- Status date: June 3, 2013
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 29
- Data sheets: [TCDS 1H15](https://openairdocs.org/tcds/1H15)
- Certificate PDF: https://openairdocs.org/files/sha256/1c/80/1c807def78a7273e1e09be3df982b360f923af069f09f10edda2089db80e08ef
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A3E0DD41216432FB86257B810045F90B.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SR01534SE

## ADs that name it (0)

None.

## Approved models (3)

- Sikorsky Aircraft S-61L ([TCDS 1H15](https://openairdocs.org/tcds/1H15))
- Sikorsky Aircraft S-61N ([TCDS 1H15](https://openairdocs.org/tcds/1H15))
- Sikorsky Aircraft S-61NM ([TCDS 1H15](https://openairdocs.org/tcds/1H15))

## 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.

NumberSR01534SE

This certificate, issued to Croman Corporation 801 Avenue C White City, OR 97503

Part 29 of the Federal Aviation Regulations.

Original ProductType Certificate Number: 1H15 Make: Sikorsky Model: S-61N; S-61NM; S-61L

Description of the Type Design Change: Installation of the transmission input modification to the main gear box of the Sikorsky S-61N helicopter in accordance with McClenahan Engineering Document DM0450-4, Revision A, dated May 21, 2013, or later Federal Aviation Administration (FAA) approved revision.

Limitations and Conditions: This approval should not be extended to other rotorcraft of this model on which other previously approved modifications are incorporated unless it is determined that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that rotorcraft. A copy of this certificate must be maintained as part of the permanent records for the modified rotorcraft. These are direct replacement parts and the FAA has determined that no Instructions for Continued Airworthiness are required.

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.

Date of application: September 13, 2004 Date reissued:

Date of issuance: April 21, 2005 Date amended: June 3, 2013

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)

## Every issue (2)

- June 3, 2013: Amended, Current. [certificate](https://openairdocs.org/files/sha256/1c/80/1c807def78a7273e1e09be3df982b360f923af069f09f10edda2089db80e08ef)
- April 21, 2005: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/3e/f3/3ef39bda5ac2cccbe8f2685f21c8839086b7f91429f79bfefc0329143f24ae57)

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