# STC SR02761LA - Type: Supplemental type certificate - Status: Current, Issued - Holder: Northern X-Treme Helicopters, United States - Description: Installation of UH-1H composite main rotor blades on the UH-1B helicopters - Applied: August 1, 2020 - Status date: March 22, 2022 - Product: Aircraft, Rotorcraft - Certification basis: Part 21, Part 27 - Data sheets: [TCDS H5SO](https://openairdocs.org/tcds/H5SO), [TCDS H7SO](https://openairdocs.org/tcds/H7SO), [TCDS H3SO](https://openairdocs.org/tcds/H3SO), [TCDS H13WE](https://openairdocs.org/tcds/H13WE), [TCDS H3NM](https://openairdocs.org/tcds/H3NM), [TCDS H1RM](https://openairdocs.org/tcds/H1RM) - Certificate PDF: https://openairdocs.org/files/sha256/41/77/41779e5a480363c627cdfe2e063a933f2a7b6e5e2d6189b89c62982f156a42f4 - Approved model list and other attachments: [AML_SR02761LA.pdf](https://openairdocs.org/files/sha256/f8/73/f87362ef352ad1ae7f913af3abaf88d3d7d669163afa49d4e0d70b1b1244d7fd) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BBEF6DE776E2A60D86258822005A917C.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SR02761LA ## ADs that name it (0) None. ## Approved models (6) - International Helicopters Inc. UH-1B ([TCDS H5SO](https://openairdocs.org/tcds/H5SO)) - Overseas Aircraft Support Inc. UH-1B ([TCDS H7SO](https://openairdocs.org/tcds/H7SO)) - Richards Heavylift Helo Inc. UH-1B ([TCDS H3SO](https://openairdocs.org/tcds/H3SO)) - Rotorcraft Development Corporation UH-1B ([TCDS H13WE](https://openairdocs.org/tcds/H13WE)) - Rotorcraft Development Corporation UH-1B ([TCDS H3NM](https://openairdocs.org/tcds/H3NM)) - San Joaquin Helicopters UH-1B ([TCDS H1RM](https://openairdocs.org/tcds/H1RM)) ## 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. SR02761LA Northern X-Treme Helicopters 7181 Howards Crossings Rd. Kelsey, CA 95667 Part 27 the Code of Federal Regulations See FAA Approved Model List (AML) SR02761LA See FAA AML SR02761LA See FAA AML SR02761LA Installation of UH-1H composite main rotor blades on the UH-1B helicopters in accordance with approved Northern X-Treme Helicopters documentation listed on AML No. SR02761LA, dated March 22, 2022, or later FAA approved revisions. Approval of this change in type design applies to the aircraft models listed on AML No. SR02761LA 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 other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. (continued) August 1, 2020 March 22, 2022 Manager, Airframe Section Los Angeles ACO Branch 3 SR02761LA 3 SR02761LA Limitations and Conditions (Continued): A copy of this Certificate and FAA Approved Model List (AML) No. SR02761LA, dated March 22, 2022, or later FAA Approved revision, 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. This installation requires the rotorcraft to be previously modified with tailboom 24” plug extension in accordance with STC SR00026DE and Lycoming T53-L-13 engine in accordance with STC SR00073DE. ### AML_SR02761LA.pdf Page 1 of 1 FAA APPROVED MODEL LIST (AML) NO. SR02761LA **NORTHERN X-TREME HELICOPTERS** **FOR INSTALLATION OF COMPOSITE MAIN ROTOR BLADES** AML Original Issue: March 22, 2022 Item Aircraft Make Aircraft Model Cert basis/ Amendment TCDS Number Flight Manual Supplement Installation Drawings Airworthiness Limitations Section Instructions for Continued Airworthiness AML Amendment Date 1 Rotorcraft Development Corporation UH-1B 21-42 H3NM Rev. 7 NXH-UH1B-1002, Rev. IR, dated 12/9/20211 NXH-INST-1001, Rev. A, dated 9/24/20211 NXH-CMRB-ICA, Approved 3/21/20221 NXH-CMRB-ICA, Rev. A, dated 3/1/20222,3 N/A 2 Rotorcraft Development Corporation UH-1B 0 H13WE Rev. 13 NXH-UH1B-1002, Rev. IR, dated 12/9/20211 NXH-INST-1001, Rev. A, dated 9/24/20211 NXH-CMRB-ICA, Approved 3/21/20221 NXH-CMRB-ICA, Rev. A, dated 3/1/20222,3 N/A 3 San Joaquin Helicopters UH-1B 0 H1RM Rev. 7 NXH-UH1B-1002, Rev. IR, dated 12/9/20211 NXH-INST-1001, Rev. A, dated 9/24/20211 NXH-CMRB-ICA, Approved 3/21/20221 NXH-CMRB-ICA, Rev. A, dated 3/1/20222,3 N/A 4 International Helicopters, Inc. UH-1B 0 H5SO Rev. 2 NXH-UH1B-1002, Rev. IR, dated 12/9/20211 NXH-INST-1001, Rev. A, dated 9/24/20211 NXH-CMRB-ICA, Approved 3/21/20221 NXH-CMRB-ICA, Rev. A, dated 3/1/20222,3 N/A 5 Richards Heavylift Helo, Inc. UH-1B 21-1 through -71 H3SO Rev. 17 NXH-UH1B-1002, Rev. IR, dated 12/9/20211 NXH-INST-1001, Rev. A, dated 9/24/20211 NXH-CMRB-ICA, Approved 3/21/20221 NXH-CMRB-ICA, Rev. A, dated 3/1/20222,3 N/A 6 Overseas Aircraft Support, Inc. UH-1B 21-1 through -42 H7SO Rev. 14 NXH-UH1B-1002, Rev. IR, dated 12/9/20211 NXH-INST-1001, Rev. A, dated 9/24/20211 NXH-CMRB-ICA, Approved 3/21/20221 NXH-CMRB-ICA, Rev. A, dated 3/1/20222,3 N/A Notes: 1 or later FAA approved revision. 2 or later FAA accepted revision, effective on the date of installation. 3 FAA accepted Instructions for Continued Airworthiness must be made available at the time of installation. FAA Approved Date: 04/11/2022 Maureen Moreland Aviation Safety Manager, Airframe Section Los Angeles ACO Branch ## Every issue (1) - March 22, 2022: Issued, Current. [certificate](https://openairdocs.org/files/sha256/41/77/41779e5a480363c627cdfe2e063a933f2a7b6e5e2d6189b89c62982f156a42f4), [AML_SR02761LA.pdf](https://openairdocs.org/files/sha256/f8/73/f87362ef352ad1ae7f913af3abaf88d3d7d669163afa49d4e0d70b1b1244d7fd) --- 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.