# STC SR02640SE - Type: Supplemental type certificate - Status: Current, Issued - Holder: Northwest Heli-Structures Inc, United States - Description: Installation of a Service Deck - Applied: June 3, 2018 - Status date: May 3, 2019 - Product: Aircraft, Rotorcraft - Certification basis: Part 21, Part 29 - Data sheets: [TCDS H4SW](https://openairdocs.org/tcds/H4SW) - Certificate PDF: https://openairdocs.org/files/sha256/71/ea/71eac734438d2abb5c9503741e14f4acea6b540293656d6645586b890a6f2ea8 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F5CDF99463D694D0862585E0003E62D4.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SR02640SE ## ADs that name it (0) None. ## Approved models (2) - Bell Textron Inc. 212 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW)) - Bell Textron Inc. 412 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW)) ## 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 SRO2640SE This certificate issued to: Northwest Heli-Structures, Inc. 3911 Spur Ridge Lane Bellingham, WA 98266 Part 29 of the Federal Aviation Regulations. Original Product -Type Certificate Number: H4SW Make: BELL Model: 12 41 Description of Type Design Change: Installation of a Service Deck in accordance with Installation Instructions DM1518-5, Revision A, dated February 26, 2019, or later Federal Aviation Administration (FAA) approved revision. Manufactured in accordance with Master Drawing List DM1518-3, Revision A, dated February 26, 2019, or later FAA approved revision. Maintained in accordance with Instructions for Continued Airworthiness (ICA) DM1518-7, Revision A, dated February 26, 2019, or later FAA accepted revision. Limitations and Conditions: Approval of this change in type design applies to the above model rotorcraft only. This approval should not be extended to other rotorcraft of this model series unless the installer determines that the relationship between this change and any other previously incorporated approved modifications will introduce no adverse effect upon the airworthiness of that rotorcraft. 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. A copy of this certificate and ICA must be maintained as part of the permanent records for the modified rotorcraft. Certification Basis: 14 CFR Part 29 dated February 1, 1965, Amdt 29-1 and 29-2. Date of Application: June 3, 2018 Date Reissued: Date of Issuance: May 3, 2019 Date Amended: FEDERAL AVIATION By Direction of the Administrator MINISTRATIOT Many marsh (Signature) FoR Acting Manager, Seattle ACO Branch (Title) The ST's supporting documentation (drawings, instructions, specifications, fight manual supplements, etc.) is the property of the STC holder. **FAA FORM 8110-2 (5/14) PAGE 1 OF 2 PAGES** ## Every issue (1) - May 3, 2019: Issued, Current. [certificate](https://openairdocs.org/files/sha256/71/ea/71eac734438d2abb5c9503741e14f4acea6b540293656d6645586b890a6f2ea8) --- 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.