# STC SA521SW - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Mitchell Industries Inc - Description: Installation of Mitchell Automatic pilot model AK157 - Status date: September 7, 1966 - Data sheets: 3A10, 3A10, 3A25, 3A25, 3A25 - Certificate PDF: https://openairdocs.org/files/sha256/81/60/816061de6389d2db2e8a8e1cb0feaf4d1a8ec3a34def4ba513de658fd66d8004 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CF688D097BAA8F2186257E75004E29AF.0001 - Page: https://openairdocs.org/stc/SA521SW ## ADs that name it None. ## Approved models (5) - Cessna Aircraft Company 310I (TCDS 3A10) - Cessna Aircraft Company 310J (TCDS 3A10) - Cessna Aircraft Company 320B (TCDS 3A25) - Cessna Aircraft Company 320C (TCDS 3A25) - Cessna Aircraft Company 320D (TCDS 3A25) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. federal Htriation Hgencg /f Supplemental 'Cgpe Certificate SA521SW MXTCHKLL ZKC. P. 0. Box 610 Mineral Wells, Texas 76067 ^^.^^ J 3A10 and 3A25 3101, 310J, 320B, 320C, 320D Installation of Mltchell Automatic Pilot Model AK157 in accordance vith Mltchell Industrie*, Inc. Bulletin Ho. 275 dated 12/15/6$, and «ub«equent FAA Approred BuUetins and/or supplenents; Mitchell Lateral Ouidance Radio Coupler, Model AK123 per Bulletin Ho. 206 dated 6/10/64; Mitchell Automatic Trl« Model AKL90 in accordance vith Bulletin HO. 30k, dated 12/15/65- 13A234-157"A" required. Mitchell Znductrlet, Inc. FAA Approved placard •^^^^cw>£fic&&Ja>ndJtwAt^yi&i&n^Jc(