# STC SA5969NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: Merlyn Products Inc., United States - Description: Installation of Lycoming TIO-540- J2B(d) engine, Hartzell HC-C3YR-2UF/FC8468D-6R, or HC-C4YR-2/ FC6660 propeller and optional Merlyn Products MPI 98-1005-519 turbocharger. - Applied: March 28, 1991 - Status date: December 13, 1996 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS 6A1](https://openairdocs.org/tcds/6A1) - Certificate PDF: https://openairdocs.org/files/sha256/91/82/918275b7c0b438558db84bc8f1e54b33aa5548001749e93aca9c446f48a5b30a - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/84F3EB89A8816DED85256CC200122CD3.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA5969NM ## ADs that name it (0) None. ## Approved models (3) - Twin Commander Aircraft Corporation 500-B ([TCDS 6A1](https://openairdocs.org/tcds/6A1)) - Twin Commander Aircraft Corporation 500-S ([TCDS 6A1](https://openairdocs.org/tcds/6A1)) - Twin Commander Aircraft Corporation 500-U ([TCDS 6A1](https://openairdocs.org/tcds/6A1)) ## 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: SA5969NM This certificate issued to: Merlyn Products, Inc. West 7500 Park Drive Spokane, WA 99204 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meets the airworthiness requirement's of Part 3 of the Civil Aviation Regulations. (See Type Certificate Data Sheet No. 6A1 for complete certification basis.) Original Product -Type Certificate Number: 6A1 Make: Twin Commander Model: 500 B, S, and U Description of Type Design Change: Installation of Lycoming TIO 540 J2B(D) engine, the Hartzell HC-C3YR-2UF/FC8468D-6R, or HC-C4YR-2/FC6660 propeller and the optional Merlyn Products MPi 98-1005-519 turbocharger in accordance with Merlyn Shrike Installation Report Number 30-1, Revision D, dated November 21, 1996, 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 these models 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 aircraft. A copy of this certificate SA5969NM, it's continuation sheet and the appropriate FAA approved Airplane Flight Manual Supplement, dated November 21, 1996, for the 500S, and 500U models, and December 13, 1996, for the 500B model, or later FAA approved revisions, shall be maintained as part of the permanent records for the modified aircraft. (See "Continuation Sheet" Page 3) Date of Application: May 28, 1991 Date Reissued: Date of Issuance: June 29, 1993 Date Amended: December 9, 1996; December 13, 1996 By Direction of the Administrator Chris (Signature) TOMNIST RATION Acting Manager, Seattle Aircraft Certification Office (Title) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA5969NM Limitations and Conditions: (Con't) Engine: Lycoming TIO-540-J2B(D) (All models) Fuel: 100/100LL minimum grade aviation gasoline (All models) Engine Limits: 350 HP, 2575 RPM, all operations Propeller and Propeller Limits: Hartzell HC-C3YR-2UF/FC8468D-6R Diameter Limits: Max-80"; Min-79" Pitch Stop Settings @ 30" Sta: High - 74.5 deg; Low - 12.0 deg Hartzell HC-C4YR-2/FC6660-0 Diameter Limit: Max - 70"; Min - 70" Pitch Stop Settings @ 30" Sta High - 75.5 deg, Low - 19.5 deg Airspeed Limits: Never Exceed Speed - 225 KCAS (All Models) C.G. Forward: 161.80 inches at 6000 Ibs (S & U Models) 167.41 inches at 8000 Ibs 169.93 inches at 8730 Ibs 171.68 inches at 8800 Ibs Aft: 173.36 inches at 8800 Ibs 174.5-10073/t. at less than 8800 Ibs C.G. Forward: 161.80 inches at 6000 Ibs (B Models) 167.41 inches at 8000 Ibs Aft: 173.36 inches at 8000 Ibs 174.5-10073/Wt. at less than 8000 Ibs Maximum Weight: 8500 Ibs all operations (S & U Models) 8800 Ibs take-off only Maximum Weight: 8000 Ibs (B Model) Note: The placards specified in the Airplane Flight Manual Supplement must be displayed in front of, and in clear view of the pilot, and must not interfere with other placards required by the Type Certificate Data Sheet. NOISE CERTIFICATION: Noise level per FAR 36 Appendix G test procedures is 83.3 dB. -END- **FAA FORM 8110-2- 1 (10-69) PAGE 3 OF 3 PAGES** ## Every issue (1) - December 13, 1996: Amended, Current. [certificate](https://openairdocs.org/files/sha256/91/82/918275b7c0b438558db84bc8f1e54b33aa5548001749e93aca9c446f48a5b30a) --- 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.