STC SA01649CH-D

Part 23 of the Federal Aviation Regulations. See Type Certificate Data Sheet No. A1WI for complete certification basis.

Installation of Rockwell Collins Pro Line 21 Communication, Navigation, and Surveillance (CNS) System, dual Collins TDR-94 Transponders, and dual Collins RTU-4220 Radio Tuning Units in accordance with Duncan Aviation Master Drawing List DA0303- 13R, Revision A, dated April 29, 2003, or later FAA approved revision.

1. FAA approved Airplane Flight Manual Supplement, DA0303-17R, revision Ø, dated April 1, 2003, FAA approved May 2, 2003, or later FAA approved revision is required, and FAA approved Airworthiness Limitations, Appendix A of Instructions for Continued Airworthiness, DA0303-19R, Revision A, FAA accepted April 28, 2003, or later FAA approved revision is required.

2. A copy of this Certificate, Flight Ma nual Supplement, and Instructions for Continued Airworthiness must be maintained as part of the permanent records of the modified aircraft.

3. Compatibility of this design change with previously appr oved modifications must be determined by the installer.

4. 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.

Duncan Aviation Inc.

3701 Aviation Rd.

Lincoln, NE 68524 A1WI Make : Cessna Aircraft Company Model : 525, 525A Date of application : April 11, 2003

Date of issuance : May 2, 2003 Date reissued : August 5, 2003, September 16, 2008

Original signed by Steve Simpson

( Signature) Steven K. Simpson DAS Administrator, DAS-501013-CE Duncan Aviation, Lincoln, Nebraska

( Title)

FAA FORM 8110-2-1(10-69) PAGE 2 of 2 PAGES

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