STC SA10341SC

FAA Form 8110-2 (5/14) Page 1 of

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Title 3 SA10341SC Blackhawk Modifications, Inc.

7601 Karl May Drive Waco, TX 76708 Civil Air Regulations 3 Option 1: Installation of Pratt & Whitney Canada PT6A-135A engines in accordance with Blackhawk Modifications, Inc.

Drawing No. 18001-01, Rev. B, dated April 1, 2004, "Installation Instructions", or later FAA approved revision. (On Option 1, the original Hartzell three bladed propellers are retained.)

(See continuation sheet 3 of 3) Option 1: FAA approved AFMS Document No. AFMS 19001, Rev. C, dated January 26, 2015, or later FAA approved revision is required for the Beechcraft C90, C90A, or E90 airplane with Pratt & Whitney Canada PT6A-135A engines. Note that the shaft horsepower is limited to 550.

(See continuation sheet 3 of 3) Scott A. Horn Acting Manager, Airplane Certification Office Southwest Region Beechcraft Corporation C90; C90A; E90 January 30, 2015 August 06, 2004 October 07, 2004 3A20

FAA Form 8110-2 (5/14) Page 2 of

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3 SA10341SC

FAA Form 8110-2 (5/14) Page 3 of

3 Description of Type Design Change (Continued):

Option 2: Installation of Pratt & Whitney Canada PT6A-135A engines and Hartzell four bladed HC-D4N-3C/D9290(S,K) or HC- E4N-3N/D8990S(K) propellers in accordance with Blackhawk Modifications, Inc. Drawing No. 19003-01, Rev. B, dated April 1, 2004, "Installation Instructions", or later FAA approved revision. (On Option 2, the original Hartzell three bladed propellers may be retained.)

Option 2: FAA approved AFMS Document No. AFMS 19003-00, Rev. C, dated January 26, 2015, or later FAA approved revision is required for the Beechcraft C90, C90A, or E90 airplane with Pratt & Whitney Canada PT6A-135A engines. Note that the shaft horsepower is limited to 550.

Each engine mount must be removed from the airplane, cleaned, and nondestructively tested (NDT) for fatigue cracks per TP20-00-00 before reinstallation. Only airplanes with less than 500 hours total time (TT) are exempt from the NDT testing of the engine mounts. Compatibility of this design change with previously approved modifications must be determined by the installer. 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.

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