STC SA2831WE-D

This Certificate issued to United Air Lines, Inc.

600 Jefferson Street Houston, Texas 77002

Part 4b of the Civil Air Regulations.

Original Product Type Certificate Number : 4A28, Rev. A Make: Boeing Model: 720-022 Description of Type Design Change : Couple EDO Loran System to ADF Sense Antenna instead of Fin Cap (No Fin Cap on UAL B720) in accordance with COA-4-1724 M aster Drawing List, ER 2, or later FAA approved revisions. Airplane to be test flown.

Limitations and Conditions : This approval of this change in type design applies basically to Boeing 720-022 only. This approval should not be exte nded to other aircraft of this mode l 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 modificati ons will introduce no adverse effect upon the airworthiness of the aircraft. A copy of this STC must be included in the permanent records of th e 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 : March 6, 1975

Date of issuance : March 16, 1975

Date reissued : November 30, 2011

( Signature) Haifa Haj-Eid Supervisor, Technical & Administrative Support Staff 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 1987-763-28