STC SA710SW

Number SA710SW

This certificate, issued to Twin Commander Aircraft LLC 1176 Telecom Drive Creedmoor, NC 27522

Part 3 of the Civil Air Regulations and Special Conditions outlined in Federal Aviation Administration (FAA) letters dated March 10, 1966 and May 10, 1966.

Original ProductType Certificate Number: 2A4 Make: Twin Commander Aircraft LLC Model: 680T

Description of the Type Design Change: Installation of United Aircraft of Canada Limited PT6A-20 engines in accordance with Swearingen Aircraft Drawing List No. 3001-DL, dated October 31, 1966, as revised on November 3, 1966.

Limitations and Conditions: Approval of this change in type design applies to the above model aircraft only.

This approval should not be extended to other aircraft of this model unless the installer determines that the relationship between this change and any other previously incorporated approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. FAA-approved Airplane Flight Manual (AFM) dated October 31, 1966, revised November 7, 1966, required. Each aircraft modified under this supplemental type certificate (STC) must have one copy of STC Data Sheet SA710SW, and Swearingen Rigging Instructions Report No. 3001-R8, as revised through November 3, 1966, placed in the aircraft with the aircraft records.

A copy of this certificate must be maintained as part of the permanent records for the modified aircraft.

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.

Date of application: February 16, 1966 Date reissued: 2/14/90; 5/26/04; 6/15/04; 11/12/09; 7/24/14 Date of issuance: October 31, 1966 Date amended: May 26, 2004; June 15, 2004

(Signature)

Manager, Seattle Aircraft Certification Office (Title)