# STC SA6023NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Horizon Instruments Inc, United States - Description: Installation of an electronic digital engine tachometer, Model P-1000. - Applied: January 28, 1993 - Status date: January 14, 2002 - Product: Aircraft, Single-Engine - Certification basis: Part 21, Part 23 - Data sheets: [TCDS A13CE](https://openairdocs.org/tcds/A13CE) - Certificate PDF: https://openairdocs.org/files/sha256/d4/b8/d4b81aa2207f746b0fe5de0b0e735e510103706970e71e543f15d0cdebc3a61c - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/129F709FCBFE036685256CC200569DEB.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA6023NM ## ADs that name it (0) None. ## Approved models (3) - The Cessna Aircraft Company 177 ([TCDS A13CE](https://openairdocs.org/tcds/A13CE)) - The Cessna Aircraft Company 177A ([TCDS A13CE](https://openairdocs.org/tcds/A13CE)) - The Cessna Aircraft Company 177B ([TCDS A13CE](https://openairdocs.org/tcds/A13CE)) ## 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: SA6023NM This certificate issued to: Horizon Instruments, Inc. 600 S. Jefferson St., Unit C Placentia, CA 92870 Certifies that the change in the type design for the following product with the limitations and conditions therefor as specified hereon meet's the airworthiness requirement's of Part 23 of the Federal Aviation Regulalions. Including FAR 23, Amendment 23-1, 23-2, and 23-3 Original Product Type Certificate Number: A13CE Make: Cessna Model: 177, 177A, 177B Description of Type Design Change: Installation of an Engine Electronic Digital Tachometer, Horizon Model P-1000, P/N P100058- (Applicability Table on continuation sheet) in Cessna model 177 aircraft, in accordance with Horizon Master Drawing List No. P100058, Rev. N/C, dated January 15, 1993, and/or later FAA approved revision. Horizon Airplane Flight Manual Supplement No. 1, Rev. N/C, May 7, 1993, or later approved revision is required. Limitations and Conditions: The installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this installation and any previously approved configuration will not introduce any adverse effect upon the airworthiness of the aircraft. The approval of this modification applies to the above noted airplane model series only. A copy of this STC must be included in the permanent records of the modified aircraft. 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. May 18, 1993 Date Amended: FEDERAL AVIATION (Signature) TOMINISTRATO Manager, Technical & Administrative Support Staff Los Angeles Aircraft Certification Office (Title) 47 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA6023NM Applicability Table Aircraft Model Serial Numbers Tachometer Part Number 177 All P100058-188- 177A All P100058-188- 177B 17701371-17701701, 17701704 P100058-166- Excl. 17701659 -1 7701665 17701959 - 17701965 P100058-168- 17701702, 17701703 17701705 - 17701773 P100058-166- 17701774 - 17702123 P100058-866- 17702124 - UP P100058-871- - END - ## Every issue (1) - January 14, 2002: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/d4/b8/d4b81aa2207f746b0fe5de0b0e735e510103706970e71e543f15d0cdebc3a61c) --- 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.