STC SA3321NM

Number SA3321NM

This certificate, issued to Gottlieb Corporation dba Air Transport Industries P. O. Box 5203 Everett, WA 98206

Part 3 of the Civil Air Regulations.

Original Product⎯Type Certificate Number: A9EA Make: DeHavilland Model: DHC-6 Series

Description of the Type Design Change: Installation of a cabin compartment combination airstair and cargo door in accordance with FAA-approved Air Transport Industries Master Drawing List No. ATI 7600-DL, Revision A or later FAA-approved revision.

Limitations and Conditions: Approval of this change in type design applies basically to the above model aircraft only. It may be used with the above models with extended wing and fuselage modified in accordance with STC SA819SW. This approval should not be extended to other aircraft of this model on which any other previously approved modifications are incorporated unless it is determined that the interrelationship 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 shall be maintained with the aircrafts permanent records.

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: August 30, 1985 Date reissued: July 14, 2006, December 4, 2008 Date of issuance: February 4, 1986 Date amended: July 14, 2006

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)