STC SA4154NM

Number SA4154NM

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

Part 23 of the Federal Aviation Regulations.

Original Product⎯Type Certificate Number: 1A6 Make: Beech Model: 99 series

Description of the Type Design Change: Modification of Beech Model 99 series airplanes in accordance with Air Transport Industries Master Drawing List 7601, Revision Level IR, dated April 8, 1999, or later Federal Aviation Administration (FAA) approved revisions. This modification replaces the original equipment doors with one of three configurations of Air Transport Industries doors.

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

This approval should not be extended to aircraft on which other previously approved modifications are incorporated unless it is determined 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, FAA approved Air Transport Industries Drawing 7601, Revision Level D, dated March 3, 1999, or later FAA approved revisions, and FAA approved Air Transport Industries document II7601, Document II7601-2, or Document II7601-3, as appropriate to the cargo door configuration installed 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 15, 1987 Date reissued: 7/14/2006; 12/4/2008 Date of issuance: December 23, 1987 Date amended: 6/10/1999; 7/14/2006

(Signature)

Acting Manager, Seattle Aircraft Certification Office (Title)