# STC SA4942NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Merlyn Products Inc., United States
- Description: Install Lycoming IO-540-AA1A5 or IO-540-S1A5(AE) engine as modified by STC SE4941NM with Rotormaster 600846-01/-02 or600803-01/-02 turbochargers.
- Applied: November 23, 1987
- Status date: May 30, 1990
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A17WE](https://openairdocs.org/tcds/A17WE)
- Certificate PDF: https://openairdocs.org/files/sha256/db/b4/dbb43fccb6cc95881bb6690fa27d961c35c299acbcdb4d9d99fad9c3249ce3a0
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/917B441245AD4A1E85256CC2000E3FD4.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA4942NM

## 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)

- Aerostar Aircraft Corporation PA-60-601P (Aerostar 601P) ([TCDS A17WE](https://openairdocs.org/tcds/A17WE))

## 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 5A9942NM This certificate issued to: Merlyn Products Purt 23 of the Federal Air Regulations.

Original Product - Type bertificate Numben: AITWE Make: Piper Model: PA-60-501P Description of Type Design Change: Install Lycoming 10-540-AA1A5 or 10-540-S1A5 (AE) engine as modified by STC SE4941NM, with Rotormaster 600846-01/-02 or 600803- 01/-02 turbochargers, in accordance with Merlyn Products, Inc. Top Drawing List 25-TDL-1, dated May 4, 1990, or later FAA approved revision.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to aircraft 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 or other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft (See Continuation Sheet, page 3).

Dale sapplicatin: November 23, 1987 Date Reissued:

Date of Issuance: . May 30, 1990 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Stewart Ramiller TOAINISTRAIOR Aircraft Certification Office Assistant Manager, (Signature) Seattle (Title)

47.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SA4942NM Limitations and Conditions: (continued) A copy of the Certificate, this Continuation Sheet and a copy of the FAA Approved Flight Manual Supplement for the Piper PA-60-601P with Lycoming I0-540-AA1A5 or - S1A5(AE) engines, dated May 29, 1990, or later FAA approved revision, must be maintained as part of the permanent record of the modified aircraft.

Engine Model: Lycoming 10-540-AA1A5 or I0-540-S1A5(AE) Engine Limits: 2425 RPM, 37 in. Hg MAP, 290 HP all operations.

- END -

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

## Every issue (1)

- May 30, 1990: Issued, Current. [certificate](https://openairdocs.org/files/sha256/db/b4/dbb43fccb6cc95881bb6690fa27d961c35c299acbcdb4d9d99fad9c3249ce3a0)

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