# STC SA5826NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Horizon Instruments Inc, United States
- Description: Installation of an engine electronic tachometer, Model P-1000.
- Applied: April 8, 1991
- Status date: November 18, 2005
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21, Part 23
- Data sheets: [TCDS 3A17](https://openairdocs.org/tcds/3A17)
- Certificate PDF: https://openairdocs.org/files/sha256/07/c2/07c27ea9036d8679f0af09cd17e46176e423ee0d568662828efb849229f3194a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D76F633C59C6F1BB862570C9006F5A90.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA5826NM

## ADs that name it (0)

None.

## Approved models (7)

- The Cessna Aircraft Company 172RG ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company 175 ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company 175A ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company 175B ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company 175C ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company P172D ([TCDS 3A17](https://openairdocs.org/tcds/3A17))
- The Cessna Aircraft Company R172K ([TCDS 3A17](https://openairdocs.org/tcds/3A17))

## 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.

This Certificate issued to Horizon Instruments, Inc.

600 S. Jefferson St., Unit C Placentia, CA 92870 Part 3 of the Civil Air Regulations, including Title 14 CFR part 23, Amendment 23-41 Original Product Type Certificate Number :

3A17 Cessna P172D, R172K, 172RG, 175, 175A, 175B, 175C Description of Type Design Change: Installation of an Engine Electronic Tachometer, Horizon Model P-1000, P/N P100056- (Applicability Table on continuation sheet) in Cessna 172 series aircraft, in accordance with Horizon Instruments, Inc. Master Drawing List No. P100056, Rev. N/C, dated March 12, 1992, or later FAA approved revision.

Horizon Airplane Flight Manual Supplement No. 1, Rev. N/C, August 12, 1992, 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 in stallation and any previously approved configuration will not introduce any adverse effect upon the airwor thiness of the aircraft. The approval of this modification applies to the above-noted airplane m odel series only. A copy of this STC m ust be included in the permanent records of the m odified aircraft. If the holder agrees to perm it 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 : April 8, 1991

Date of issuance : August 28, 1992

Date reissued : January 14, 2002 November 18, 2005

( Signature) Manager, Propulsion Branch Los Angeles Aircraft Certification Office

Page 2 of 2 Number SA5826NM

Applicability Table

Aircraft Model Year Horizon Tachometer Part Number

P172D 1963 P100056-149 R172K 1977 - 1981 P100056-164 172RG 1980 - 1985 P100056-176 175 1958 - 1959 P100056-186 175A 1960 P100056-186 175B 1961 P100056-186 172C 1962 P100056-186

- END -

## Every issue (1)

- November 18, 2005: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/07/c2/07c27ea9036d8679f0af09cd17e46176e423ee0d568662828efb849229f3194a)

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