STC SA02853CH

Dayton, OH 45424

Part 4a of the Civil Air Regulations.

Original Product--Type Certificate Number : A-743

Installation of an external step on the left hand side of the fuselage in accordance with Doubletee Master Drawing List, Boeing Model A75N1 (PT17) Entry Step, Document Number TT-09-01002, Revision B dated January 31, 2010.

1) This modification has not been evaluated to check its proper operations for its intended function.

2) The installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this installation and any previously approved configuration will not introduce any adverse effect upon the airworthiness of the aircraft.

3) 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.

Make : Boeing Airplane Company Wichita Division

Model : A75L3; 75 (Army PT-13); A75 (Army PT-13A, -13B, -13C); B75 (Navy N2S-

E75 (Army PT-13D, Navy N2S-5; PT-13D/N2S-5); A75J1 (Army PT-18);

A75L300; A75N1 (Army PT-17, -17A; Navy N2S-1, -4); B75N1 (Navy N2S-3);

D75N1 (Army PT-27); IB75A; E75N1

Date of application : January 15, 2010

Date of issuance : July 2, 2010 Date reissued :

By direction of the Administrator Original Signed By:

Mary Ellen A. Schutt ( Signature) Mary Ellen A. Schutt Manager, Airframe and Administrative Branch Chicago Aircraft Certification Office

( Title)

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Number

FAA FORM 8110-2-1(10-69) PAGE 3 of 3 PAGES

Number ST00XXXCH-D Date of Issuance: XXXXXX Date Amended: XXXXXX