# STC SA420CH

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Champion Aerospace LLC, United States
- Description: Install the Champion Limited Authority Spark Advance Regulator (LASARTM) ignition system
- Applied: May 5, 1995
- Status date: February 10, 2009
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/b7/6c/b76c8d1679e9fd7db27e1d8319edb1973b85f00e05960313a5d459a6c3dab7e9
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F2231237026F114086257597007674EB.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA420CH

## ADs that name it (0)

None.

## Approved models (6)

- Cessna Aircraft Company 172I ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172K ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172L ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172M ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172N ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172P ([TCDS 3A12](https://openairdocs.org/tcds/3A12))

## 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.

Part 3 of the Civil Air Regulations.

(See Type Certificate Data Sheet 3A12 for the complete certification basis).

Original Product--Type Certificate Number: 3A12 Make: Cessna

Model : 172I, 172K, 172L, 172M, 172N*, 172P, * Penn Yan STC SA1356GL Description of Type Design Change:

Install the Champion Limited Authority Spark Advance Regulator (LASARTM) ignition system in accordance with STC SE419CH and Unison Service Letter SL2-95, Revision D, dated March 29, 1996, or later FAA approved revisions.

1. Compatibility of this design change with previously approved modifications must be determined by the installer.

2. LASARTM ignition system may result in higher cylinder head temperature (CHT). Follow the mixture leaning procedures contained in the original Flight Manual to maintain CHT below the maximum limit..

3. Unison Flight Manual Supplement FMS 1-95, dated 10/4/95 or later FAA approved revision is required for this installation.

4. A copy of this certificate must be maintained as part of the permanent records for the modified aircraft.

5. Check weight and balance calculations.

6. 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.

Champion Aerospace LLC 1230 Old Norris Road Liberty, SC 29657

Date reissued : February 14, 1996, April 9, 1996, February 10, 2009 Date amended : April 9, 1996

Original Signed By: Thaddeus D. Krolicki, Jr

( Signature) Thaddeus D. Krolicki, Jr.

Manager, Propulsion Branch Chicago Aircraft Certification Office

( Title)

Date of application : May 5, 1995

Date of issuance : October 18, 1995

## Every issue (1)

- February 10, 2009: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b7/6c/b76c8d1679e9fd7db27e1d8319edb1973b85f00e05960313a5d459a6c3dab7e9)

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