# STC SH476NW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Siam Hiller Holdings Inc, United States - Description: Installation of an agricultural spray system. - Applied: August 6, 1976 - Status date: April 15, 2009 - Product: Aircraft, Rotorcraft - Certification basis: Part 21, Part 27 - Data sheets: [TCDS 4H11](https://openairdocs.org/tcds/4H11) - Certificate PDF: https://openairdocs.org/files/sha256/95/8a/958ae0285d259285c7bb16b1d15d96b60fd97a3b9323282aab863342c658d40e - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FBF76A67CC1F3337862575AF0049D94E.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SH476NW ## ADs that name it (0) None. ## Approved models (1) - Rogerson Hiller Corporation UH-12E ([TCDS 4H11](https://openairdocs.org/tcds/4H11)) ## 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 This certificate has been reissued to replace the original certificate reported as lost. Number: SH476NW This certificate issued to: Siam Hiller Holdings, Inc. 925 M Street Firebaugh, California 93622 Part 6 of the Civil Air Regulations. effective December 20, 1956. See page 3 and 4 of this STC for certification basis. Original Product Type Certificate Number: 4H11 Make: Hiller Model: UH-12E Description of Type Design Change: Installation of an agricultural spray system in accordance with FAA approved Soloy Conversions, Ltd. Drawing List No. 560-801 which consists of tank and booms from Simplex Manufacturing Company Aerial Spray System STC SH273NW and a Solordesign pump drive system. NOTE: Only those Hiller UH-12E rotorcraft which have been converted to turbine power in accordance with STC SH178WE are eligible for this modification. Limitations and Conditions: Approval of this change in type design applies to the above model rotorcraft only. The intended use of the modified rotorcraft is for restricted category operations only. A copy of this Certificate must be maintained as part of the permanent records for the modified rotorcraft. The limitations and conditions of Rotorcraft Type Certificate 4H11 and STC SH178WE apply except as outlined on pages 3 and 4 of this STC. 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. Date of Application: August 6, 1976 Date Reissued: 06/02/83; 10/25/84; 05/28/91; 11/30/95; 04/15/09 Date of Issuance: July 13, 1977 Date Amended: 07/22/75; 05/28/91 FEDERAL AVIATION By Direction of the Administrator Waa ariel TOMNISTRATIOR Superv Staff, Los Angeles Aircraft Certification Office isor, Technical & Administrative Support (Title) TRANSFER ENDORSEMENT Transfer the ownership of the Supplemental Type Certificate Number to (Name of transferee) (Address of transfer) (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) Extent of Authority (if licensing agreement): Signature of grantor (In ink): United States of America Department of Transportation Federal Aviation Administration Supplemental Cype Certiticate (Continuation Sheet) Number: SH476NW Limitations and Conditions: (Continued) 1. Applicability a. The approval of this change in type design applies to the basic Hiller Model UH-12E rotorcraft as modified by STC SH178WE. This approval should not be extended to other rotorcraft of this model on which other previously 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. b. The approval is for the combination of Soloy and Simplex equipment described in Soloy Drawing List No. 560-801 only. Any other spray system used in conjunction with the Soloy pump drive system must evaluated and approved by the FAA. c. The upper gearbox-mounted hydraulic pump, as installed on the Soloy/Hiller rotorcraft, has been evaluated up to a steady running load of 18 H.P. (maximum) at a pump shaft speed of 2324 R.P.M. 2. Rotorcraft Flight Manual Supplement The FAA approved Soloy Conversions, Ltd. Rotorcraft Flight Manual Supplement RFMS-6 for the agricultural spray system is required together with the FAA approved Soloy Conversions, Ltd. Rotorcraft Flight Manual dated April 10, 1975, with Supplement dated January 20, 1976, is required in lieu of that specified for the basic unmodified Model UH-12E. Refer to the applicable portions of this FAA approved Soloy Conversions, Ltd. Rotorcraft Flight Manual Supplement for required placards. 3. Certification Basis a. Civil Air Regulations Part 6 dated January 15, 1956, with Amendments 6-1 through 6-7 thereto. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SH476NW b. The following paragraphs of Federal Aviation Regulations part 27 including Amendment 27-1 thereto: ยงยง 27.45 through 27.79, 27.143, 27.361(a), 27.901 through 27.1193, 27.1305, 27.1337, 27.1351(c), 27.1353, 27.1505, 27.1509(c), 27.1521, 27.1549 through 27.1555, 27.1557, 27.1559, 27.1583(b), and (f), 27.1587, 27.1589. c. Special Conditions 27-1-WE-1, dated August 6, 1968, and Amendment 1 thereto, dated February 28, 1975. d. Paragraph 21. 25 of the Federal Aviation Regulations. - END - ## Every issue (1) - April 15, 2009: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/95/8a/958ae0285d259285c7bb16b1d15d96b60fd97a3b9323282aab863342c658d40e) --- 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.