# STC SH4179NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Soloy LLC, United States - Description: Installation of the 250-C20R/2 or R/4 engine - Applied: April 16, 1987 - Status date: May 31, 2012 - Product: Aircraft, Rotorcraft - Certification basis: Part 21 - Data sheets: [TCDS H2SW](https://openairdocs.org/tcds/H2SW) - Certificate PDF: https://openairdocs.org/files/sha256/ac/ed/aced0c4f68ffbb354092ee7487db9de2500f2f6221785e16e2f867899cb781ea - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7A3B4C0AC624BA2586257A39004EFC4E.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SH4179NM ## ADs that name it (1) - [AD 95-24-06](https://openairdocs.org/ad/95-24-06): Rfms Changes - Autorotation · Bell Helicopter Textron Canada 206B and 206L with STC SH4169NM or 2 others. Effective Dec 27, 1995. Named in the applicability ## Approved models (2) - Bell Helicopter Textron Canada Limited 206A ([TCDS H2SW](https://openairdocs.org/tcds/H2SW)) - Bell Helicopter Textron Canada Limited 206B ([TCDS H2SW](https://openairdocs.org/tcds/H2SW)) ## 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. Part 6 of the Civil Air Regulations. Installation of the 250-C20R/2 or R/4 engine in accordance with FAA sealed Soloy, LLC Master Drawing List No. 680-300, dated March 25, 1988, Advance Master Drawing List Revision dated March 28, 1988, and Advance Master Drawing List Revision, dated December 8, 1988, or later FAA approved re visions. This approval covers Bell 206A and 206B helicopters with serial numbers 4 and above. Limitations and Conditions: Approval of this change in type design applies to the above models of aircraft only. Compatibility of this design change with previously approved modifications must be determined by the installer. A copy of this Certificate and Continuation Sheet must be maintained as part of the permanent records for the modified aircraft. 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. (See Continuation Sheet) This certificate and the supporting data, which is the basis for approval, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration. Soloy, LLC. 450 Pat Kennedy Way, SW Olympia, WA 98501 H2SW Make : Bell Helicopter Textron, Inc. Model : 206A, 206B Date reissued: June 23, 1988; May 4, 1993; August 25, 1995; December 28, 2006, May 31, 2012 Date amended: February 7, 1989 By direction of the Administrator Original Signed By: Timothy Smyth ( Signature) Timothy Smyth Manager, Propulsion Branch Chicago Aircraft Certification Office Date of application: April 16, 1987 Date of issuance : March 31, 1988 FAA FORM 8110-2-1(10-69) PAGE 4 of 4 PAGES Number SH4179NM Limitations and Conditions (Continued): Certain limitations and conditions shown on Type Certificate Data Sheet (TCDS) No. H2SW for the Model 206B apply to model 206A and 206B aircraft modified in accordance with this STC. The following list contains those limitations and conditions which have been modified and certain unmodified ones which are listed for clarity. Model: Bell 206A and 206B as modified by this STC (normal category rotorcraft) Engine: Rolls-Royce Model 250-C20R/2 or 250-C20R/4 Engine Limits: Power Ratings (Sea Level, ISA) Takeoff – 450 s.h.p. Max. Continuous – 450 s.h.p. Gas Generator Speeds Takeofff – 50537 RPM Max. Continuous – 50537 RPM Exhaust Gas Temperatures Takeoff - 810 ° C Max. Continuous - 810 ° C to 843° C (not to exceed 6 seconds) Max. Transient - 810 ° C to 899° C (not to exceed 12 seconds) (maximum 3 occurrences per turbine wheel life) Max. Starting - 810 ° C to 927° C Transmission Limits: Max. Takeoff Power – Torque = 100 percent (317 s.h.p.) Max. Continuous – Torque = 85 percent (270 s.h.p.) Helicopter Limits: Max. Takeoff – Torque = 100 percent (317 s.h.p.) Max. Continuous – Torque = 85 percent (270 s.h.p.) Max. Continuous – EGT = 752 ° C Fuel: Normal Fuels MIL-T-5624, JP-4, JP-5 ASTM-D-1655, Jet A, A1, or B; and Arctic Diesel Fuel DF-A (VV-F-800B), Jet A or A1 JP-a conforming to ASTM-D-1655, Jet A or A1 MIL-T-83133, grade JP-8 Diesel No. 1 conforming to ASTM-D-1655, Jet A Emergency Fuels MIL-G-5572, any grade, is permitted for a maximum of 6 hours per turbine overhaul period. MIL-G-5572 fuel containing TRICRESYLPHOSPHATE (TCP) shall not be used. Lubricating Oil: MIL-L-7808G or MI L-L-23699 and subsequent revisions. FAA FORM 8110-2-1(10-69) PAGE 4 of 4 PAGES Number SH4179NM Limitations and Conditions (Continued): Certification Basis: FAR 21.29 and CAR 6, effective December 20, 1956, Amendments 6-1 through 6-4, CAR 6.307(b) and 6.637 of Amendment 6-5, Special Conditions, dated October 2, 1962, revised February 8, 1966, plus the water/alcohol power augmentation special conditions dated November 14, 1967, revised September 15, 1975. Special Conditions for “IFR Instrument Flight Requirements for Bell Model 206B/L” submitted by Bell to FAA letter dated July 16, 1975. Equipment: The basic required equipment as prescrib ed in the applicable airworthiness regulations (see Certification Basis) must be installed in the helicopter for certification. In addition, a Soloy, LLC Rotorcraft Flight Manual Supplement (RFMS), dated March 31, 1988, or later FAA-approved revision is required. Note 1: Information essential to the proper maintenance of the helicopter is contained in the manufacturer’s maintenan ce manual provided with each helicopter. Note 2: Takeoff Torque Limit and Ma ximum Continuous Torque Limit Placards, as specified in the RFMS for this STC, mu st be placed in the cockpit in plain view of the pilot. Note 3: This change in type design is applicable to Bell Models 206A and 206B serial numbers 4 and subsequent. - END - ## Every issue (2) - May 31, 2012: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/ac/ed/aced0c4f68ffbb354092ee7487db9de2500f2f6221785e16e2f867899cb781ea) - December 28, 2006: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/7a/5d/7a5d1b7d32738cbd57e6085dfbb6d81bc4ec3b4a2b01e4bb17c9d618ace106d4) --- 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.