STC SA01801AT: For the Cessna 172 airplane models incorporating Lycoming… on Cessna 172 and 33 more

For the Cessna 172 airplane models incorporating Lycoming O-320 engines: Modification of the standard exhaust system as documented in Laminar Flow Systems Installation Instructions Document, "Laminar Flow System Extractor Exhaust System" Revision A, dated, November 20, 1998 and Technical Drawing List, Book No. PFS-B-800, dated, November 16, 1998 or per Power Flow Systems, Inc. Installation Instructions Document PFS-0058-00, Rev. A, dated October 5, 2001 and Master Drawing List, Report No. PFS-0032-00, Rev. IR, dated August 10, 2000, or later FAA approved revisions. For the Cessna 172 airplane models incorporating Lycoming O-320 ,O-360 0r IO-360 engines: Modify the standard exhaust system as document in Power Flow Systems, Inc. Installation Instructions Document PFS-13250-00, Rev B, dated, December 9, 2002 and Master Drawing list PFS-13240-00, Rev, IR, dated October 3, 2002.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA01801AT

This certificate issued to: Power Flow Systems, Inc.

795 Fentress Blvd, Ste A & B Daytona Beach, FL 32114

3, 36 of Civil Air and CFR 14 .

Original Product Type Certificate Number: 3A12 A4EU 3A17 Make: Cessna; Cessna-Reims Aviation

Model: 172, A-H; 172 I; 172 K-N, P; (Cont.)

For the Cessna 172 airplane models incorporating Lycoming 0-320 engines: Modification of the standard exhaust system as documented in Laminar Flow Systems Installation Instructions Document, "Laminar Flow System Extractor Exhaust System" Revision A, dated, November 20, 1998 and Technical Drawing List, Book No. PFS-B-800, dated, November 16, 1998 or per Power Flow Systems, Inc. Installation Instructions Document PFS-0058-00, Rev. A, dated October 5, 2001. (See continuation sheet 3)

This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated, unless it is determined by the installer that the interrelationship between this change and any other previously approved modifications will produce no adverse effect upon the airworthiness (See continuation sheet 3)

Date of Application: May 30, 1997 Date Reissued: June 22, 2000; October 16, 2003

Date of Issuance: January 7, 1999

Date Amended: July 24, 2003; August 22, 2003; (Cont.)

(for) Christina M. Underwood Manager, East Certification Branch

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA01801AT

(Continuation Sheet) Number: SA01801AT Model (cont.):

172Q, 172R, 172S; F172D thru F172H; F172K-N, F172P; 175, 175A, 175B, 175C

Description of Type Design Change (cont.):

Installation Instructions Document PFS-0058-00, Rev. A, dated October 5, 2001.

For the Cessna 172 and 175 airplane models incorporating Lycoming 0-320 ,0-360 or 10-360 engines: Modify the standard exhaust system as document in Power Flow Systems, Inc. Installation Instructions Document PFS-13250-00, Rev B, dated, December 9, 2002.

Limitations and Conditions (cont):

of that airplane. 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 Amended(cont.):

September 14, 2004; May 20, 2025