# STC SA2891WE - Type: Supplemental type certificate - Status: Current, Reissued - Holder: RPM Commander LLC, United States - Description: Installation of Lycoming IO-720-B1B turbocharged engine. - Applied: October 12, 1973 - Status date: April 16, 2008 - Product: Aircraft, Small Airplane - Certification basis: Part 3, Part 21 - Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4) - Certificate PDF: https://openairdocs.org/files/sha256/6d/f5/6df543d438eeca7b841d5720ea55b57047eff4ad632c2a9c22ecb97ff47d0851 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6BA4CC529F27B1238625743A00521D62.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA2891WE ## ADs that name it (2) - [AD 2005-18-20](https://openairdocs.org/ad/2005-18-20): "FASTprop" propeller de-icers · Hartzell PHC-C3YF-1RF/F8468A(B,K)-8R constant speed propeller (STC SA00718LA or 17 others). Effective Oct 14, 2005. Named in the applicability - [AD 79-12-07](https://openairdocs.org/ad/79-12-07): Magnetos · Bendix Magnetos, TIO-540-F2BD, TIO-540-N2BD and 3 more. Effective Jun 19, 1979. Cited in the text ## Approved models (3) - Twin Commander Aircraft Corporation 680-F ([TCDS 2A4](https://openairdocs.org/tcds/2A4)) - Twin Commander Aircraft Corporation 680-FL ([TCDS 2A4](https://openairdocs.org/tcds/2A4)) - Twin Commander Aircraft Corporation 680-FL(P) ([TCDS 2A4](https://openairdocs.org/tcds/2A4)) ## 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 SA2891WE This certificate issued to RPM Commander LLC 1401 North Riverside Drive, Suite 607 Pompano Beach, FL 33062 Part 3 of the Civil Air Regulations. Original Product--Type Certificate Number 2A4 Make : Gulfstream American Model : 680FL, 680FL(P), and 680(F) Pressurized Description of Type Design Change: Installation of Lycoming IO-720-B1B turbocharged engine according to FAA sealed Mr. RPM, Inc. Drawing 41003. Installation of Lycoming IO-720-B1BD turbocharged engine according to Mr. RPM, Inc. Drawing 41003, Rev. K, dated 9/8/77, or later FAA approved revision. Non-acoustical change is eligible for Model 680FL gross weight 8500 lbs., 80-inch dia. propellers w/reduced maximum continuous power when IO-720- B1B engine is installed, Drawing 43003-1, Reissue A dated 5/31/78, and List of drawing changes for Drawing List 1015DL”K” change dated 9/8/77, revised 9/29/82, is required. This certificate and the supporting data which is the basis fo r approval shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration. Date of application : October 12, 1973 Date of issuance : May 29, 1974 Date reissued : January 30, 2006, April 16, 2008 Date amended : 7/12/74; 8/2/74; 9/29/77; 5/17/79; 4/16/80; 10/8/82 Rev. 6 ( Signature) Melvin D. Taylor, Manager Atlanta Aircraft Certification Office ( Title) INSTRUCTIONS: Thc transfer endorsement below may be used to notify the appropriate FAA Regi onal Office of the transfer of this Supplemental Type Certificate. The FAA will reissue the certifi cate in the name of the tran sferee and forward it to him. Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and Street) (City, State, and ZIP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and Street) (City, State, and ZIP code) Signature of grantor (In ink): United States of America Department of Transportation −Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SA2891WE Date of Issuance: May 29, 1974 Reissued Date: January 30, 2006 April 16, 2008 1. For Model 680FL and 680FL(P) at a gross weight of 8000 lbs. or 8500 lbs with 80” diameter propellers FAA Approved Airplane Flight Manual Supplement dated 5/29/74 or later approved revision are required. 2. For Model 680FL and 680FL(P) at a gross weight of 8000 lbs or 8500 lbs. with 84” diameter propellers FAA Approved Airplane Flight Manual Supplement dated 6/5/74 or later approved revisions are required. 3. For Model 680F(P) at a gross weight of 8000 lbs. with 80” diameter propellers FAA Approved Airplane Flight Manual Supplement dated 7/12/74 or later approved revision are required. 4. For Model 680FL with reduced MCP at a gross weight of 8500 lbs. with 80” diameter propellers FAA Approved Airplane Flight Manual Supplement dated 5/31/78 or later approved revisions are required. 5. Each original FAA Approved Airplane Flight Manual Supplement must include the proper FAA approved revision when: a. Lycoming IO-720-B1BD engine is installed. b. Turbo-charger operation is automatically controlled. c. New c.g. limits and flight envelope eligible on Model 680F(P), Item 3, that have Service Bulletin No. 128 or No. 129 installed. 6. Compatibility of this design change with previously approved modifications must be determined by the installer. 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. -END- FAA FORM 8110-2-1(10-69) PAGE 3 of 3 PAGES ## Every issue (2) - April 16, 2008: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/6d/f5/6df543d438eeca7b841d5720ea55b57047eff4ad632c2a9c22ecb97ff47d0851) - January 30, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/37/60/376095a84ad8d646ef7940a22215770a686f4173a2586ab964d2b862cd317070) --- 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.