# STC SE4157NM

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Merlyn Products Inc., United States
- Description: Installation of modified turbochargers, controller, wastegate actuator and link, scavenge pump and manifold pressure relief valves.
- Applied: May 27, 1987
- Status date: May 8, 1990
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1E4](https://openairdocs.org/tcds/1E4)
- Certificate PDF: https://openairdocs.org/files/sha256/8c/2c/8c2c9d8b593ad4345f8204bd942bcc61fe98a0fe151af38e4a26f48625135a48
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D103713BD0CB2EC285256CC2005A7564.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE4157NM

## ADs that name it (1)

- [AD 2002-19-03](https://openairdocs.org/ad/2002-19-03): Crankshaft · Lycoming Engines IO-540-A1A5, IO-540-AA1A5, IO-540-AA1B5 and 81 more. Effective Sep 20, 2002. Named in the applicability

## Approved models (1)

- Lycoming Engines IO-540-AA1A5 ([TCDS 1E4](https://openairdocs.org/tcds/1E4))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SE4157NM This certificate issued to: Merlyn Products, INC.

Part 13 s/ the CIViT Air Regulalions., as amended by 13-1, 13-2, and 13-3.

Original Product - Type bertificate Numben: IE4-12 Make: Lycoming Model: 10-540-AA1A5 rotor poorehange 1502 or 600512) Stroler (iftomaster • Installation of Merlyn Products, Inc. modified 250002-03/-05/-06), wastegate actuator (Rotomaster 250001-04) and link, scavenge pump (Rotomaster 101633-01/-02/-31/-32) and manifold pressure relief valves on Lycoming engines in accordance with FAA sealed Merlyn Products, Inc. Top Drawing List No.

12-TDL-1, Revision G, dated May 4, 1990, and the Samurai 350 Installation Instructions, Report No. 12-1, Revision F, dated May 7, 1990, or later FAA approved revision. This modification includes a change in the engine ratings as delineated on the Continuation Sheet.

Limitations and Conditions: Data is suitable for reproduction and incorporation on all Lycoming IO-540-AA1A5 engines installed to support airplane STC No. SA4156NM only.

This approval should not be extended to any other engine. This approval should not be extended to engines 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 engine.

Date of Application: May 27, 1987 Lute missued:

Valenfissuance: January 4, 1988 Valumended: March 29, 1988; August 16, 1989 May 8, 1990 FEDERAL AVIATION By Direction of the Administrator Stunt Kan blas (Signalure) TAMINIS RAN O Assistant Manager, Seattle Aircraft Certification Office (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SEA157 NM New Engine Ratings: 330 Hp @ 42 in. hg. MAP and 2500 RPM (SLS/ISA) 350 Hp @ 42 in. hg. MAP and 2500 RPM (23,000 ft.

critical altitude/ISA) Limitations and Conditions: (continued) A copy of this Certificate and Continuation Sheet in combination with documentation delineated in STC No. SA4156NM, shall be maintained as part of the permanent records for each modified aircraft.

- END -

**FAA FORM 8110-2-1 (10-69) PAGE 3OF 3 PAGES**

## Every issue (1)

- May 8, 1990: Amended, Current. [certificate](https://openairdocs.org/files/sha256/8c/2c/8c2c9d8b593ad4345f8204bd942bcc61fe98a0fe151af38e4a26f48625135a48)

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