# STC SR01274AT - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Whisper Jet, Inc., United States - Description: Installation of cabin doors and windows. - Applied: March 18, 1996 - Status date: July 1, 2002 - Product: Aircraft, Rotorcraft - Certification basis: Part 21 - Data sheets: [TCDS 1H4](https://openairdocs.org/tcds/1H4) - Certificate PDF: https://openairdocs.org/files/sha256/0b/40/0b40f0222882d0222d41f3dc28500245ed5228f25b481d4de782fedac69b75e2 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9F72AB707B6F060685256CC2006226FB.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SR01274AT ## ADs that name it (0) None. ## Approved models (1) - Sikorsky Aircraft Corporation S-55 ([TCDS 1H4](https://openairdocs.org/tcds/1H4)) ## 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 SRO1274AT This certificate issued to: Whisper Jet, Inc. 12515 Willows Road, NE Suite 200 Kirkland, WA 98034 Certifies that the change in the type design for the following product with the limitations and conditions therefer as specified hereen meets the airworthiness requirenents of Part 6 of the Civil Air Begulations. Original Product --Type Certificate Number: TH4 Make: Sikorsky Model: S-55 Description of Type Design Change: Installation of cabin doors and windows in accordance with Orlando Aviation Inc. Master Drawing List OA55-00-20000, Revision A, dated October 18, 1996, or later FAA approved revisions. Limitations and Conditions: This approval should not be extended to other rotorcraft of this model on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those other previously approved modifications will produce 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 suspended, revoked or a ternination date is otherwise estublished by the Administrator of the Federal Aviation Administration. Date of Application: March 18, 1996 Date Reissued: July 01, 2002 Dute of insunce: February 18, 1997 Date Amended: FEDERAL AVIATION Son of the Jotninistrator * Melvin D. Taylor (Signature) TOMINS TRATIO Manager Atlanta Aircraft Certification Office (Title) 47 ## Every issue (1) - July 1, 2002: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/0b/40/0b40f0222882d0222d41f3dc28500245ed5228f25b481d4de782fedac69b75e2) --- 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.