# STC SA4705SW - Type: Supplemental type certificate - Status: Current, Amended - Holder: Blackhawk Modifications Inc. - Description: Installation of Pratt & Whitney PT6A-27 or PT6A-28 engines. - Status date: January 6, 2009 - Data sheets: 3A20, 3A20, 3A20 - Certificate PDF: https://openairdocs.org/files/sha256/f7/85/f78580da2486788416ca2816f41a906c61069230817626ce4a14e16f29d6771f - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D91F51F3C2F6855986257554004CC854.0001 - Page: https://openairdocs.org/stc/SA4705SW ## ADs that name it None. ## Approved models (3) - Beechcraft Corporation 65-A90 (TCDS 3A20) - Beechcraft Corporation B90 (TCDS 3A20) - Beechcraft Corporation C90 (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. Description of Type Design Change: Installation of Pratt & Whitney PT6A-27 or PT6A-28 engines in Model C90 in accordance with Drawing 02-001, Revision B, dated June 5, 2008 or later FAA approved revision or in Model 65- A90 or B90 in accordance with Drawing 04-001, Revision B, dated June 5, 2008 or later FAA approved revision. Engines can be either type certified Pratt and Whitney PT6A-27 or PT6A-28 engines, converted PT6A-27 or PT6A-28 engines from PT6A-21 engines in accordance with Atlantic Turbines International, Inc. Limitations and Conditions: The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission. Blackhawk Modifications, Inc. 7601 Karl May Drive Waco, TX 76708 3A20 Make : Beech Model : 65-A90, B90, C90 Date of application: March 24, 1982 Date of issuance: June 29, 1982 Date amended: June 13, 1985; January 06, 2009 ( Signature) S. Frances Cox Manager, Special Certification Office Southwest Region ( Title) FAA Form 8110-2-1(10-69) Page 2 of 3 FAA Form 8110-2-1(10-69) Page 3 of 3 Number SA4705SW Date of Issuance: June 29, 1982 Date Amended: January 06, 2009 Description of Type Design Change (Continued): Inc. STC SE02290NY, or converted PT6A-27 or PT6A-28 engines from PT6A-11 engines in accordance with Atlantic Turbines International Inc. STC SE02501NY. Required instructions for Continued Airworthiness are contained in Document No. 200802-30, Revision IR, or latest FAA accepted revision. FAA Approved Airplane Flight Manual Supplement 200802C, Rev. A, dated August 29, 2008, or later FAA approved revision is required for C90. FAA Approved Airplane Flight Manual Supplement 200802AB, Rev. A, dated August 29, 2008, or later FAA approved revision is required for 65A-90 and B90. Certification Basis: The certification basis for this STC is the same as for the original certification basis for these model airplanes as defined in TCDS 3A20 except for 14 CFR 23 Paragraphs 23.1, 23.21, 23.23, 23.29, 23.33, 23.301, 23.303, 23.305, 23.307, 23.321, 23.331, 23.333, 23.337, 23.341, 23.361, 23.363, 23.371, 23.601, 23.603, 23.605, 23.609, 23.629, 23.771, 23.865, 23.901, 23.903, 23.905, 23.907, 23.925, 23.929, 23.933, 23.937, 23.939, 23.943, 23.951, 23.955, 23.961, 23.991, 23.993, 23.994, 23.995, 23.997, 23.999, 23.1011, 23.1013, 23.1015, 23.1017, 23.1019, 23.1021, 23.1023, 23.1027, 23.1041, 23.1043, 23.1045, 23.1091, 23.1093, 23.1103, 23.1105, 23.1107, 23.1111, 23.1121, 23.1123, 23.1141, 23.1143, 23.1145, 23.1149, 23.1153, 231155, 231163, 23.1165, 23.1181, 23. 1183, 23.1189, 23.1191, 231192, 23.1193, 23.1301, 23.1305, 23.1309, 23.1321, 23.1322, 23.1337, 23.1351, 23.1357, 23.1359, 23.1365, 23.1367, 23.1381, 23.1419, 23.1431, 23.1437, 23.1461, 23.1501, 23.1513, 23.1519, 23.1521, 23.1525, 23.1527, 23.1529, 23.1541, 23.1543, 23.1549, 23.1551, 23.1581, 23.1583, 23.1585, 23.1587, 23.1589 which are amended by Amendment 23-57. 14CFR 34 Paragraphs 34.1, 34.2, 34.3, 34.5, 34.6, 34.7, 34.10, 34.11 which are amended by Amendment 34-3. 14 CFR 36 Paragraphs 36.1, 36.2, 36.9, 36.501, 36.1501, 36.1581 which are amended by Amendment 36-26. ## Every issue (2) - January 6, 2009: Amended, Current. [certificate](https://openairdocs.org/files/sha256/f7/85/f78580da2486788416ca2816f41a906c61069230817626ce4a14e16f29d6771f) - December 6, 2004: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/7b/8a/7b8a7c0c2f7d92b528c5973c3921c78743c18170b65f569542c6cac4d7a6a875) --- From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.