STC SE31WE

FAA Form 8110-2 (5/14) Page 1 of 2

Number: SE31WE

Part 13 of the Civil Air Regulations.

Original Product – Type Certificate Number: E-123, 5E-1 Make: Pratt & Whtiney Model: SF, -2, -3, T1B2, T1B3, B-4, B-5 and R-985 Series Description of Type Design Change:

Installation of Electro-Coatings, Inc. piston rings P/N 251822, 251824, and 251825 on Pratt and Whitney R-985 piston P/N 27056 for use with Channelcromium plated R-985 engine cylinders in accordance with Drawings 251822, 251824, and 251825 revised 6/17/69.

The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter the product, the holder must give the other person written evidence of that permission.

Date of Application: March 15, 1966 Date Reissued: 08/27/07; 07/20/15; 01/25/16; 10/31/16 Date of Issuance: October 20, 1966 Date Amended: 6/17/69; 12/20/82 Revision 2

Signature

Title James A. Grigg Acting Manager, Fort Worth Aircraft Certification Office, Southwest Region Continental Motors Inc.

2039 S. Broad St.

Mobile, AL 36615

FAA Form 8110-2 (5/14) Page 2 of 2

Transfer the ownership of Supplemental Type Certificate Number: SE31WE

To (Name and address of transferee)

From (Name and address of grantor)

FAA Form 8110-2 (5/14) Page 3 of 3