# STC SR02728LA - Type: Supplemental type certificate - Status: Current, Issued - Holder: Coulson Aviation (USA) Inc., United States - Description: Installation of Retardant Aerial Delivery System Large (RADS - Applied: September 12, 2019 - Status date: June 16, 2020 - Product: Aircraft, Rotorcraft - Certification basis: Part 29 - Data sheets: [TCDS R00024LA](https://openairdocs.org/tcds/R00024LA) - Certificate PDF: https://openairdocs.org/files/sha256/02/92/0292cc15c25f82d48bc39f43957e754554a3705564c3003d3f140356b194e797 - Approved model list and other attachments: [SR02728LA_AML.pdf](https://openairdocs.org/files/sha256/42/0f/420f94e6d38ccb6c57066e52101cfb1d9074edd67f6bc83a1989ac24007b0e88) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID127460990220230203190508.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SR02728LA ## ADs that name it (0) None. ## Approved models (1) - Unical Air Inc. CH-47D ([TCDS R00024LA](https://openairdocs.org/tcds/R00024LA)) ## 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 SR02728LA This Certificate issued to Coulson Aviation (USA) Inc. 655 South Rock Blvd. Reno, NV 89502 Part 29* of the Federal Aviation Regulations. * see continuation sheet for certification basis Original Product Type Certificate Number : ** See attached FAA Approved Model List (AML) No. SR02728LA for list of approved rotorcraft model Description of Type Design Change: Installation of Retardant Aerial Delivery System Large (RADS-L) for the special purpose of Forest and Wildlife Conservation on rotorcraft model approved in the AML in accordance with the Master Drawing List (MDL), Rotorcraft Flight Manual Supplements (RFMS) and Instructions for Continued Airworthiness (ICA) noted in AML SR02728LA. Limitations and Conditions: The approval of this modification applies to the model listed on FAA approved AML SR02728LA only. This installation should not be extended to other specific rotorcrafts of this model series on which other approved modifications are incorporated, unless it is determined that the interrelationship between this change and any of those other previously 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. 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 Date of application: September 12, 2019 Date of issuance: June 16, 2020 (Signature) Manager, Airframe Section Los Angeles ACO Branch (Title) 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): Certification Basis: For areas unaffected by this modification, see the applicable TCDS listed in AML SR02728LA For areas affected by this modification: Regulations, which include amendments 29-0 through 25-57 14 CFR: 29.21, 29.29, 29.143, 29.171, 29.301 - 29.307, 29.601 - 29.613, 29.625, 29.777, 29.787, 29.853, 29.865, 29.1301, 29.1309, 29.1322, 29.1351, 29.1353, 29.1357, 29.1381, 29.1435, 29.1501, 29.1523, 29.1525, 29.1529, 29.1557, 29.1559, 29.1581, 29.1583, 29.1585, 29.1589 Regulations at an intermediate amendment 29.561 Amendment 0, 29.571 Amendment 29-20 ### SR02728LA_AML.pdf Page 1 of 1 FAA APPROVED MODEL LIST (AML) NO. SR02728LA, Rev. IR For COULSON AVIATION (USA) INC. INSTALLATION RADS L TANK Document Number: SR02728LA Issue Date: 06/16/2020 Item Aircraft Make Aircraft Model Original TC Number Certification Basis for Alteration Rotorcraft Flight Manual Supplement Master Drawing List Instructions for Continued Airworthiness Airworthiness Limitation Section AML Amendment Number 1 Unical Aviation, Inc. CH-47D R00024LA As noted on STC SR02728LA R-CH47-01000-RFMS, Rev IR, dated June 15, 2020 or later FAA approved revisions. R-CH47-01000, Rev. C, dated 04/10/2020 or later FAA approved revisions. R-CH47-01000-ICA, Rev IR, dated 04/25/2020 or later FAA accepted revisions. R-CH47-01000-ICA Rev IR, Appendix A dated 06/16/2020 or later FAA approved revision. Rev IR: Initial Release, dated 06/16/2020 FAA Approved: Manager, Airframe Section Los Angeles ACO Branch ## Every issue (1) - June 16, 2020: Issued, Current. [certificate](https://openairdocs.org/files/sha256/02/92/0292cc15c25f82d48bc39f43957e754554a3705564c3003d3f140356b194e797), [SR02728LA_AML.pdf](https://openairdocs.org/files/sha256/42/0f/420f94e6d38ccb6c57066e52101cfb1d9074edd67f6bc83a1989ac24007b0e88) --- 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.