# STC SA3253SW-D - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Century Flight Systems Inc, United States - Description: Installation of Mitchell automatic flight system model AK677 consisting of Piper altimatic IIIC autopilot with optional radio coupler and glide slope couplers - Applied: December 6, 1977 - Status date: March 28, 1984 - Product: Aircraft, Single-Engine - Certification basis: Part 21 - Data sheets: [TCDS A3SO](https://openairdocs.org/tcds/A3SO) - Certificate PDF: https://openairdocs.org/files/sha256/99/54/99545659315eb5db5d3f246df3672867775e3cc1fa84f802c76eb3e181730991 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/ABE8BC8EFC60DD5886257DA800659CC5.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SA3253SW-D ## ADs that name it (0) None. ## Approved models (2) - Piper Aircraft Inc. PA-32RT-300 ([TCDS A3SO](https://openairdocs.org/tcds/A3SO)) - Piper Aircraft Inc. PA-32RT-300T ([TCDS A3SO](https://openairdocs.org/tcds/A3SO)) ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA925354-0 This certificate issued to: Century Flight Systems, Inc. F.M. 1195 P. O. Box 610 Mineral Wells, TX 76067 Part 3 of the CIVII AIT Regulations: Original Product - Type bertificate Number: A350 Make: Piper Model: PA-32RI-300, PA-32RT-300T Description of Type Design Change: Installation of Mitchell Automatic Flight System Model AK677 consisting of Piper Altimatic IIIC Autopilot with Optional Radio Coupler and Glide Slope Coupler according to Bulletin No. 806, Rev. 2, dated 4-19-78 and Master Drawing List No. 87A972, Rev. B, dated 4-19-78 (14 Volt System) and/or later FAA approved revision. Limitations and Conditions: FAA/DAS Approved P11ot's Operating Handbook Supplement, P/N 685617 dated 1-5-78 rev. 1-23-78 18 required for Piper PA-32RT-300. FAA/DAS Approved Airplane Flight Manual Supplement P/N 685663-S dated 5-1-78 18 required for Piper PA-32RI-300I, or later FAA approved revision. A placard stating 'Conduct trim check prior to flight - (See POH)! ds required for owners with Pilot s Operating Handboos. A placard atatingConduct trim check prior with other previously approved modifications with airplane flight manuals. his certificate and the supporting d aust be determined DY line dalu which is the basis fir approval shall remain in effect until su rendered, suspended, revoked, or a termination date is sheruise established by the Adminialrate v sf the Federal Aviation Administration . Date of Application: 12-6-77 Jule wissued: 5-1-78; 3-28-84 Revision 2 Date of Issuance: . 1-5-78 Sale umended: FEDERAL AVIATION Don P. Watson (Signature ) * MINISTRATO Manager, Aircraft Certification Division Southwest Region (Title) 47 FAA FORM 8110-2 (10-68) TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) _ (Address of transferee) (po9175 prco sequent) (so die par as )) from (Name of grantor) (Print or sype) (Address of grantor) (Number and sireel ; (spor 812 pace pas 410) Extent of Authority (if licensing agreement): Date of Transfer: - Signature of grantor (In ink):. +11