# STC SR00274BO - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Pro Star Aviation, LLC, United States - Description: Installation of an L3 Communications GH-3100 Electronic Standby Instrument System (ESIS) and Optional Emergency Bus - Applied: October 9, 2007 - Status date: September 13, 2018 - Product: Aircraft, Rotorcraft - Certification basis: Part 21 - Data sheets: [TCDS H1NE](https://openairdocs.org/tcds/H1NE) - Certificate PDF: https://openairdocs.org/files/sha256/c1/fd/c1fdae9f4189b40ac46453534dbff3876ab07b8c386230c5796190564fa512e8 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1DF798DE8C4FAE698625832200511572.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SR00274BO ## ADs that name it (0) None. ## Approved models (3) - Sikorsky Aircraft Corporation S-76A ([TCDS H1NE](https://openairdocs.org/tcds/H1NE)) - Sikorsky Aircraft Corporation S-76B ([TCDS H1NE](https://openairdocs.org/tcds/H1NE)) - Sikorsky Aircraft Corporation S-76C ([TCDS H1NE](https://openairdocs.org/tcds/H1NE)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. AVIATION United States of America Department of Transportation PHIVYSTRAND Federal Aviation Administration Supplemental Type Certificate Number: SR00274BO This certificate issued to: Pro Star Aviation, LLC 8 Kelly Avenue Londonderry, NH 03053 Part 29 of the Federal Aviation Regulations. Original Product - Type Certificate Number: HINE Make: Sikorsky Aircraft Corporation Model: S-76A. S-76B, S-76C Description of Type Design Change: Installation of an L3 Communications GH-3100 Electronic Standby Instrument System (ESIS) and Optional Emergency Bus in accordance with Pro Star Installation Data List, Document Number 20740-IDL-02, Rev F, dated September 1, 2010, or later FAA-approved revision. 1. 1. The Rotorcraft Flight Manual Supplement, Document Number 20740-FMS-02, Revision A, dated July 20, 2011, or later FAA-approved revision, is required and must be carried in the aircraft during all flights. 2. 2. The Instructions for Continued Airworthiness, Document Number 20740-ICA-02, Revision A, dated December 11, 2009 shall be made available to the operator at the time of installation. 3. 3. Compatibility of this design with previously approved modifications must be determined by the installer. (See continuation on page 3 of 3) Date of Application: October 9, 2007 Date Reissued: September 13, 2018 Date of Issuance: July 18. 2008 Date Amended: July 20, 2011 By Direction of the Administrator Signature Ravi Prite Kevin Dickert Title Manager, Boston ACO Branch FAA Form 8110-2 (5/14) Page 1 of 3 Transfer Endorsement Transfer the ownership of Supplemental Type Certificate Number: SRO0274BO To (Name and address of transferee) From (Name and address of grantor) Extent of Authority (if licensing agreement): The ST's supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is the property of the STC holder. FAA Form 8110-2 (5/14) Page 2 of 3 AVIATION United States of America Department of Transportation TADISTRAD Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SR00274BO Certification Basis: Based on 14 CFR $$ 21.115 and 21.101. and the FAA policy for non-significant changes in the FAA Order 8110.48, the certification basis for the installation of an L3 Communications GH-3100 Electronic Standby Instrument System (ESIS) and Optional Emergency Bus in the Sikorsky S-76A, S-76B, and S-76C helicopters is as follows: a. The Type certification basis for Sikorsky Model S-76A, S-76B. and S-76C helicopters is shown on the TCDS HINE. Revision 21, for parts not changed or not affected by the change. b. The certification basis-for parts changed or affected-by the change since the reference date of application, October 28. 2009, is based upon Part 29 as indicated in the Certification Basis section of Type Certificate Data Sheet (TCDS) HINE, Revision 30, dated August 5, 2009. Based on 14 CFR $$ 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48. the certification basis for this modification was determined to be: Regulations at the latest amendment 29-0 ฿29.29. $29.301. $29.303, $29.305, §29.561, $29.601. $29.603, $29.605, §29.609, $29.613, $29.1301, $29.1309. $29.1321, §29.1327, $29.1331, $29.1333. $29.1351. $29.1353. $29.1355. $29.1357. $29.1359, §29.1381, $29.1431, $29.1501, $29.1541, $29.1543, $29.1545, $29.1581 Regulations at the latest amendment 29-2 $29.1585 Regulations at the latest amendment 29-3 $29.773. $29.1323. $29.1583 Regulations at the latest amendment 29-4 ฿29.307, $29.1529 Regulations at the latest amendment 29-5 $29.607 Regulations at the latest amendment 29-24 ฿29.1303. §29.1325 END FAA Form 8110-2 (5/14) Page 3 of 3 ## Every issue (3) - September 13, 2018: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/c1/fd/c1fdae9f4189b40ac46453534dbff3876ab07b8c386230c5796190564fa512e8) - July 20, 2011: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/32/e2/32e2e9672f2145be1447c13e2a1dbcb25a899ecadc050a98ffe4ee4c61151e07) - July 18, 2008: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/84/99/8499a89ebbb484db4872567c127cbef93a63c2b6929fbef36c384c0c06a7ee4b) --- 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.