STC SA4097WE

This Certificate issued to AIRWELD, INCORPORATED 8167 Belvedere Avenue, Suite D Sacramento, California 95826

Part 4b* of the Civil Air Regulations.

*(Certification basis is set forth in Type Certificate Data Sheet 4A26.)

Original Product Type Certificate Number 4A26 Make : Boeing Model : 707-300, 707-300B, and 707-300C Series Description of Type Design Change: Installation of forward and/or aft entrance airstair in accordance with FAA approved World Auxiliary Power Company Drawing Li st Number 1423-3000, Revision “AE” or Winters Aircraft Engineering Drawing List Number 1423-3000, Revision “D” or later FAA approved revision. Winters Aircraft Airstair-3 Weight and Balance Document Number 932, Revision N/C, (forward installation only);

Revision A, (forward and/or aft installation), or later FAA approved revision is required.

Limitations and Conditions: This installation should not be incorporated in any aircraft unless it is determined by the installer that the interrelationship between this cha nge and any previously appr oved configuration will not introduce any adverse effect upon the airworthiness of the aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the hol der shall give the other person written evidence of that permission.

Date of application : November 2, 1979

Date of issuance : February 5, 1980

Date reissued : February 23, 1989; July 16, 1997; January 5, 2000; December 3, 2001; April 28, 2008

Date amended : December 20, 1984; July 9, 1990

( Signature) Mansour Rafat Manager, Cabin Safety/Mechanical & Environmental Safety Branch Los Angeles Aircraft Certification Office ( Title)

Transfer the ownership of Supplemental Type Certificate Number

to (Name of transferee)

(Address of transferee) (Number and street)

(City, State, and ZIP Code)

from (Name of grantor) (Print or type)

(Address of grantor) (Number and street)

(City, State, and ZIP Code)

Signature of grantor (In ink):

U.S. GPO 1987-763-289