# STC SA1421SO - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Mike Jones Aircraft Sales Inc., United States - Description: Installation of 40:1 gear ratio wing flap transmissions and related changes in accordance with Colemill Enterprises, Inc., Installation Instructions dated February 16, 1983, or later FAA approved revision. This modification provides and equivalent means of compliance with paragraphs (a)1, (a)2, and (a)4 of AD 82-27-13 and restores the 40 (full) flap travel. - Applied: February 16, 1983 - Status date: February 10, 2011 - Product: Aircraft, Small Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS A20SO](https://openairdocs.org/tcds/A20SO), [TCDS A8EA](https://openairdocs.org/tcds/A8EA) - Certificate PDF: https://openairdocs.org/files/sha256/00/a0/00a0cb220ccd2785d22fa3544fdea34e4f83231f8ec5388d0cb431f9180ea99e - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9E7283962369B36F8625784E007713F3.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA1421SO ## ADs that name it (0) None. ## Approved models (5) - Piper Aircraft Inc. PA-31 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO)) - Piper Aircraft Inc. PA-31-300 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO)) - Piper Aircraft Inc. PA-31-325 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO)) - Piper Aircraft Inc. PA-31-350 ([TCDS A20SO](https://openairdocs.org/tcds/A20SO)) - Piper Aircraft Inc. PA-31P ([TCDS A8EA](https://openairdocs.org/tcds/A8EA)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number SAI4210 This certificate issued to: Mike Jones Aircraft Sales, Inc. 1932 Memorial BIvd Murfreesboro, TN 37129 Certifies that the change in the type design for the following product with the linitutions and conditions therefere as specified hereen meets the airverthiness requirement's of Part 3 of the Civil Air Regulations. Original Product - TypeLertificate Number: AZOSO, ASEA Make: Piper Model: See attached continuation sheet Description of Type Design Change: Installation of 40:1 gear ratio wing flap transmissions and related changes in accordance with Colemill Enterprises, Inc., Installation Instructions dated February 16, 1983, or later FAA approved revision. This modification provides and equivalent means of compliance with paragraphs (a)1, (a)2, and (a)4 of AD 82-27-13 and restores the 40° (full) flap travel. 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 of those other previously approved modifications will introduce no adverse effect on the airworthiness of that airplane. An FAA Approved Airplane Flight Manual Supplement, dated March 14, 1983, and applicable to the aircraft model and serial number is required with each installation. suspended, revsked or a terination date is otherwise established by the Advinistrater of the Federal Aviation • Arministration Date of Application: February 16, 1983 Date Reissued: February 10, 2011 Late of ismance: March 14, 1983 Date Amended: FEDERAL AVIATION By direction of luvinistraly Melvin D. Taylor Signgture) TOMINISTRATO Manager Atlanta Aircraft Certification Office (Title) 47 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number SAI42150 Date of Issuance: March 14, 1983 Model, Continued: PA-31 (S/NS 31-2 thru 31-7812129), PA-31-300 (S/Ns 31-2 thru 31-511), PA-31-325 (S/Ns 31-7300932 thru 31-7812129), PA-31-350 (S/Ns 31-5001 thru 31-7852171), and PA-31P (S/Ns 31P-1 thru 31P-7730012), airplanes. •--END ## Every issue (1) - February 10, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/00/a0/00a0cb220ccd2785d22fa3544fdea34e4f83231f8ec5388d0cb431f9180ea99e) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.