# STC SA01994AT - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Performance Conversions Unlimited LLC, United States - Description: Installation of two Motorlet, Walter model M601E-11 engines and two Avia-Hamilton model VJ8.510 propeller systems. - Applied: August 27, 1998 - Status date: March 4, 2008 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 3, Part 21 - Data sheets: [TCDS 3A20](https://openairdocs.org/tcds/3A20) - Certificate PDF: https://openairdocs.org/files/sha256/51/e7/51e7bf65e2a9ec3466b6d92cd98b475cefe7fedd8166ac25b2bb2745b12cdc3c - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C754BD7E46AD93C986257448007E0A33.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA01994AT ## ADs that name it (0) None. ## Approved models (2) - Raytheon Aircraft Company C90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20)) - Raytheon Aircraft Company E90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20)) ## 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. Part 3 of the Civil Air Regulations. (See Type Certificate Data Sheet No. 3A20 for complete certification basis) Original Product Type Certificate Number: 3A20 Make: Hawker Beechcraft Corporation Model: C90, E90 Installation of two Walter a.s. model M601E-11 or M601E-11A engines and two AVIA Propeller Ltd. model VJ8.510 propeller systems in accordance with Performance Conversions Unlimited, L.L.C. Installation Manual, Revision I, dated September 20, 2007 and Master Drawing List, Report 6, Revision L, dated March 4, 2008, or later FAA Approved revisions. 1. Compatibility of this design change with previously approved modifications must be determined by the installer. 2. FAA Approved Performance Conversions Unlimited, L.L.C. Airplane Flight Manual Supplement modified in accordance with this STC SA01994AT or later FAA Approved revision is required. 3. Aircraft specifications are the same as listed on Type Certificate Data Sheet (TCDS) 3A20 except as listed in the FAA Approved Airplane Flight Manual Supplement for Hawker Beechcraft C90 and E90 modified in accordance with this STC. (See continuation sheet on page 3) Performance Conversions Unlimited, L.L.C. 1921 Airport Drive Green Bay, Wisconsin 56313 Date of application : August 27, 1998 Date of issuance : September 16, 1999 Date reissued : May 17, 2001, December 10, 2003 Date amended : April 23, 2002, March 4, 2008 ( Signature) Thaddeus D. Krolicki, Jr. Manager, Propulsion Branch Chicago Aircraft Certification Office ( Title) FAA FORM 8110-2-1(10-69) PAGE 3 of 3 PAGES Number SA01994AT Date Amended: March 4, 2008 LIMITATIONS AND CONDITIONS: (Continued) 4. Limits for Walter a.s. turboprop engine model M601E-11 or M601E-11A and AVIA propeller model VJ8.510 are as published in the FAA Approved Airplane Flight Manual Supplement for Beechcraft C90 and E90 model airplanes. 5 The life limit for the AVIA propeller model VJ8.510, in accordance with Type Certificate Data Sheet Number P2BO, and as referenced in the AVIA Maintenance Manual, is 6,000 flight hours. 6. Power lever positions below flight idle (Beta range) when aircraft is in flight can result in severe overspeeding and/or loss of aircraft control. 7. 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. …End… ## Every issue (1) - March 4, 2008: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/51/e7/51e7bf65e2a9ec3466b6d92cd98b475cefe7fedd8166ac25b2bb2745b12cdc3c) --- 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.