STC SA3441WE

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

Part 4b of the Civil Air Regulations.

Original Product Type Certificate Number 4A21 Make : Boeing Model : 707-138B and 707-123B Description of Type Design Change: Installation of an airstair in accord ance with FAA sealed Winters Aircraft Engineering Company Drawing List Number 1423-1000, Revision Z or later FAA approved revision.

Limitations and Conditions: The approval of this change in type design applies basically to the above listed models 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 interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft. This determination should include consideration of significant changes in weight in the fuselage. 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 : June 14, 1977

Date of issuance : June 30, 1977

Date reissued : January 26, 1978; November 25, 1988;

July 16, 1997; January 5, 2000; December 3, 2001; April 28, 2008

Date amended : June 19, 1978; March 15, 1979

( 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