STC SA3097WE

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA3097WE This certificate issued to: Northwest Airlines, InC.

2700 Lone Oak Parkway Eagan, MN 55124 Part 4b sf the CiVIl Air Regulations: (dated December 31, 1953 (See T.C. Data Sheet AGWE) Original Product - Type Certificate Number: AGWE Make: McDonnell Douglas Model: DC-9 Series 10 and DC-9 Series 30 Description of Type Design Change:

Installation of Collins Radio Company Model FPC-75 Ground Proximity Warning System in accordance with FAA Sealed Hughes Airwest Master Drawing List No. RW3450004, Revision F dated February 26, 1976, or later FAA sealed revision.

Hughes Airwest FAA Approved Airplane Flight Manual Supplement No. 1 dated April 6, 1976, or later approved revisions to Douglas Airplane Flight Manual Documents LB-32999, DAC-33530 and DAC-67033, is required as part of this installation.

Limitations and Conditions: The approval of this change in type design applies basically to the McDonnell Douglas Model DC-9 Series 10 and DC-9 Series 30. 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 distribution such as an increase in the fixed disposable weight in the

Date of Application: April 3, 1975 Date Reissued: October 13, 1982, November 14, 1986 Date of Issuance: October 22, 1975 Date Amended: April 6, 1976 FEDERAL AVIATION imiriralar * W. F. Horn (Signature) TO OE Manager, Chicago Aircraft Certification Office, ACE-115C, Central Region, FAA (Title)