STC SA5728NM

Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number $1.5728NM This certificate issued to: PneuDraulics, Inc.

8575 Helms Avenue Rancho Cucamonga, California 91730 Part 25 of the Federal. Anintion Porgulutivas.

Original Product -Type Certificate Number: A16WE Make: Boeing Model: 737 Description of Type Design Change: Replacement of forward and/or aft lavatory drain valves with PneuDraulics, Inc. Model 9527 Lavatory Drain Valve, defined by PneuDraulics Drawing List DL-9527- 737, dated January 22, 1992, or Revision A, dated March 30, 1992, or Revision B dated September 7, 1993, or Revision C, dated April 18, 1995, or later FAA-approved revisions, and installed in accordance with PneuDraulics, Inc. Maintenance Manual Supplement Section 9527-38-32-81, dated January 10, 1992.

Similation and Genditions: The Approval of this change applies to all Boeing Model 737 airplanes and shall not be extended to other models of this airplane on which other previously approved modifications have been incorporated, unless it is determined that the interrelationship between this change and any of those previously approved modifications will introduce no adverse effect upon the airworthiness of the airplane. A copy of this Certificate shall be maintained as a part of the permanent records for this modified aircraft.

Date of Application: February 5, 1992 Date Reissued:

Into of issuurce: July 8, 1993 Date Amended: June 29, 1995;

*EDERAL By Direction of the Administrator Poral I tile (Signature) Acting Manager, Seattle Aircraft Certification Office.

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