STC SA5167NM

Number SA5167NM

This certificate, issued to: D’Shannon Products, Ltd.

1309 County Road 134 Buffalo, MN 55313

Part 3 of the Civil Air Regulations.

Original Product Type Certificate Number: A7CE Make: Cessna Model: 414A*, 421B

Description of the Type Design Change:

Installation of vortex generators on the wings and vertical stabilizer and strakes on outboard side of engine nacelles, in accordance with V/G Systems, Inc. Drawing List, Report No. DL-120, dated March 1, 1991, or later FAA Approved revision.

* For the 414A, this installation is compatible with Robertson STOL system.

Approval of this change in type design applies to the above model aircraft only. This approval should not be extended to other aircraft on which other previously approved modifications are incorporated unless it is determined by the installer that the relationship between this change and any of those other previously approved modifications, including changes in type design, will introduce no adverse effect upon the airworthiness of that aircraft. A copy of this Certificate must be maintained as part of the permanent records for the modified aircraft. The Approved Flight Manual Supplement, dated October 24, 1991, or later approved revision for the 421B model aircraft, or AFMS, dated November 21, 1991, or later approved revision for the 414A* model aircraft must be maintained as part of the permanent record for the modified aircraft only when the aircraft is operated in accordance with revised flight limitations.

Date of application: January 18, 1991 Date reissued: November 22, 2011, June 14, 2012

Date of issuance: June 12, 1991 Date amended: October 24, 1991, December 2, 1991, Febru ary 7, 1992

Timothy Smyth

(Signature) Timothy Smyth Manager, Propulsion Branch Chicago Aircraft Certification Office

(Title)