# STC SA02057SE

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Richard Melhoff, United States
- Description: Modification of aircraft and installation of Jacobs L-6MB engine, a Hamilton Standard 2B-20-9 propeller, a Cessna 195 engine ring mounted on a WACO ATO engine mount, and associated accessories and hardware on WACO ATO, serial number A-81
- Applied: March 20, 2009
- Status date: March 16, 2010
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21, Part 23
- Data sheets: [TCDS ATC 123](https://openairdocs.org/tcds/ATC%20123)
- Certificate PDF: https://openairdocs.org/files/sha256/d4/a9/d4a95252f6532b1835f41529a8eb6b58ee1bf7a558b54c79ef7880a30d2c22ed
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AB9C404111593B42862576EF0068152A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA02057SE

## ADs that name it (0)

None.

## Approved models (1)

- The Waco Aircraft Company ATO ([TCDS ATC 123](https://openairdocs.org/tcds/ATC%20123))

## 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.

Number SA02057SE

This certificate, issued to: Richard Melhoff 19500 NE Ribbon Ridge Road Newberg, OR 97132

Part 23 of the Federal Aviation Regulations.

Original Product⎯Type Certificate Number: ATC 123 Make: The WACO Aircraft Company Model: ATO

Description of the Type Design Change: Modification of aircraft and installation of Jacobs L-6MB engine, a Hamilton Standard 2B-20-9 propeller, a Cessna 195 engine ring mounted on a WACO ATO engine mount, and associated accessories and hardware on WACO ATO, serial number A-81. Installation and maintenance shall be in accordance with the Instructions for Continued Airworthiness (ICA) Document RM-ICA-001, Revision A-0, dated October 14, 2009, or later FAA-approved revision.

Limitations and Conditions: Approval of this change in type design applies to aircraft serial number A-81 only.

The airplane modified in accordance with this STC must be operated in accordance with the FAA-approved Supplemental Airplane Flight Manual (SAFM), Supplement No. R1022, dated February 10, 2010, or later FAA-approved revision.

A copy of this certificate, the ICA, and the SAFM must be maintained as part of the permanent records for the modified aircraft.

Date of application: March 20, 2009 Date reissued: Xxxxxxx ##, #### Date of issuance: March 16, 2010 Date amended: Xxxxxxx ##, ####

(Signature) Acting Manager, Seattle Aircraft Certification Office (Title) Original Signed by Robert H. Duffer

## Every issue (1)

- March 16, 2010: Issued, Current. [certificate](https://openairdocs.org/files/sha256/d4/a9/d4a95252f6532b1835f41529a8eb6b58ee1bf7a558b54c79ef7880a30d2c22ed)

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