# STC SA420CE

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Barbara or Bob Williams, United States
- Description: Installation of 0-360-(  ) series engines, fixed pitch and constant speed propellers
- Applied: January 28, 1966
- Status date: October 31, 1986
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A12](https://openairdocs.org/tcds/3A12)
- Certificate PDF: https://openairdocs.org/files/sha256/4f/9d/4f9dce18349f231f31539a8cff857afbd30cdac5f012784a048f9473ecafc9c6
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9E1F40B1A7F360CB86257B5E00561A18.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA420CE

## ADs that name it (3)

- [AD 82-07-02](https://openairdocs.org/ad/82-07-02): Engine Crankcase Breather · Lycoming O-360-A1A engine and Hartzell HC-C2YK-1B/7666A-2… (Avcon Industries STC SA1324CE or 14 others). Effective Apr 8, 1982. Named in the applicability
- [AD 77-16-01](https://openairdocs.org/ad/77-16-01): Actuating Pins · McCauley Propeller Systems 2A34C, 2A36C1, 2A36C18 and 8 more. Effective Aug 9, 1977. Cited in the text
- [AD 69-15-03](https://openairdocs.org/ad/69-15-03): Muffler Assembly · Lycoming O-320-A1A, A1B, A3A, A3B or Lycoming O-320-B1A, B1B… (D'Shannon Products STC SA135CE or 8 others). Effective Aug 20, 1969. Named in the applicability

## Approved models (9)

- Cessna Aircraft Company 172 ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172A ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172B ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172C ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172D ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172E ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172F (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172G ([TCDS 3A12](https://openairdocs.org/tcds/3A12))
- Cessna Aircraft Company 172H (USAF T-41A) ([TCDS 3A12](https://openairdocs.org/tcds/3A12))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (3)

- October 31, 1986: Amended, Current. [certificate](https://openairdocs.org/files/sha256/4f/9d/4f9dce18349f231f31539a8cff857afbd30cdac5f012784a048f9473ecafc9c6)
- September 5, 1979: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/31/2b/312b7ef2f877baafbda7ddaba901d0ce78a6e0b2e5db606be07ed60fba638955)
- July 1, 1975: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/5f/14/5f1479e8fe9d01c40f49a8e060fa0d40b22313b506404e0c090ee6d9fbe64ea3)

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