STC SA00770SE

United States of America Department of Transportation_Federal Aviation Administration Supplemental Type Certificate Number SA00770SE

This certificate, issued to: James R. Metzger 38205 SW 70th Washougal, WA 98671

Part 3 of the Civil Air Regulations.

Original ProductType Certificate Number: 2A4 Make: Twin Commander Model: 680, 680E, 720

Description of the Type Design Change: Installation of two (2) Hartzel Model HC-B3Z20- 2A/10151(B)-8(R), or two (2) HC-93Z20-2C/10151(B)-8(R) propellers on the above model aircraft, per James Metzger’s Document JM0001, Revision A, dated January 10, 2000, or later FAA approved revision.

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 these models 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 and FAA approved Flight Manual Supplement, Revision A, dated February 18, 2000, or later FAA approved revision, 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: October 5, 1999 Date reissued:

Date of issuance January 18, 2000 Date amended: 2/18/00; 6/24/04

(Signature)

Acting Manager, Seattle Aircraft Certification Office

(Title)