STC SA7812SW-D

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA7812SW-D This certificate issued to: S-TEC Corporation One S-TEC Way Mineral Wells Municipal Airport Mineral Wells, TX 76067-9236 Certifies that the change in the type design for the following freduct with the limitations and conditions therefor as specified hercen meets the ninothiness requiements of Part 3 of the kirit din Regulutions.

Original Product Type Certificate A unter: A20SO Make: Piper Model: PA-31, PA-31-300, PA-31-325, and PA-31-350 Description of Type Design Change:

Installation of S-TEC Yaw Damper System, Model ST-468, according to Bulletin No. 568, Revision 3, dated 1-07-99 and Master Drawing List No. 92558, Revision C, dated 1-07-99 or later FAA Approved revisions of the above data (28 Volt System).

Also eligible on models PA-31 and PA-31-300 when modified per STC SA970SO (350 H.P.

Colemill conversion).

Also eligible on model PA-31-325 when modified per STC SA00048SE (vortex generator system).

Also eligible on model PA-31-350 when modified per STC SA1151SO (Colemill Panther II conversion) and/or any of the following SICS: STC SA5796NW, STC SA00192SE, STC SA00039SE, STC SA00126SE (vortex generators and gross weight increase).

(See Continuation Sheet, Page 2, a part of this STC.)

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: 2-19-92 Date Reissued:

Date of Issuance: 3-09-92 Date Amended: 5-09-97, 11-09-98, 1-12-99 Revision 3 By Direction of the Administrator EDERAL AVIATION Milal le (Signature) TOMINSTRATO Michael Keirnan DAS Staff Coordinator, DAS 5 SW (Title)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA7812SW-D, Revision 3 Limitations and Conditions: (con't.)

4. FAA/DAS Approved Airplane Flight Manual Supplement, P/N 89963, dated 3-09-92 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 89963, Revision 1, dated 5-09-97 is required for Piper Models PA-31 and PA-31-300 And The Above Models When Modified Per STC SA970SO (350 H.P. Colemill Conversion) and Model PA-31-325 And The Above Model When Modified Per STC SA00048SE (Vortex Generator System) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 89963, Revision 2, dated 11-09-98 is required for Piper models PA-31 and PA-31-300 and the above models when modified per STC SA970SO (350 H.P. Colemill conversion) and model PA-31-325 and the above model when modified per STC SA00048SE (vortex generator system) and model PA-31-350 and the above model when modified per STC SA1151SO (Colemill Panther I| conversion) or later FAA Approved revisions of the above supplement.

FAA/DAS Approved Pilot's Operating Handbook and/or Airplane Flight Manual Supplement, P/N 89963, Revision 3, dated 1-12-99 is required for Piper models PA-31 and PA-31-300 and the above models when modified per STC SA970SO (350 H.P. Colemill conversion) and Piper model PA-31-325 and the above model when modified per STC SA00048SE (vortex generator system) and Piper model PA-31-350 and the above model when modified per STC SA1151SO (Colemill Panther II conversion) and/or any of the following STCS: SIC SA5796NW, STC SA00192SE, STC SA00039SE, STC SA00126SE (vortex generators and gross weight increase) or later FAA Approved revisions of the above supplement.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

FAA Form 8110-2-1(10-69) Page 2 of 2

TRANSFER ENDORSEMENT 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) (Numher and streel) (Calr. Stale, and All code ) Extent of Authority (if licensing agreement):

Date of Transfer: - Signature of grantor (In ink):.