# STC SA3-13

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: D'Shannon Products Ltd., United States
- Description: Install 170 hp Lycoming O-340-A1A engine and Hartzell HC-82XL-1DB/8433-12 propeller according to Doyn data listed on Engineering Releases 100 (3/22/58), 1010 (3/16/57), 1011 (8/28/57), 1012 (7/15/57), 1014 (3/30/57), 1050 (7/13/57), 1051 (& DCN 1, 12/10/57), 1052 (7/19/57), 1053 (7/19/57), 1099 (3/22/58), and Instructions (2 sheets, undated) Data required for parts manufacture:  As listed on Engineering Releases 1001 (1/18/57), 1002 (12/21/57), 1003 (5/1/57), 1004 (7/13/57), 1005 (7/12/57), 1006 (3/30/57), 1007 (4/12/57), 1008 (2/27/57), 1009 (10/23/57), 1015 (2/25/56).
- Applied: December 31, 1956
- Status date: July 14, 2011
- Product: Aircraft, Single-Engine
- Certification basis: Part 3, Part 21
- Data sheets: [TCDS A-799](https://openairdocs.org/tcds/A-799)
- Certificate PDF: https://openairdocs.org/files/sha256/0a/96/0a968e406d9198017b02d5dfa8f4cdf91288cc79f728cf8288be75b5d4955916
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/57031D6944F7E9F6862578EF0047F007.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA3-13

## ADs that name it (2)

- [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 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 (2)

- The Cessna Aircraft Company 170A ([TCDS A-799](https://openairdocs.org/tcds/A-799))
- The Cessna Aircraft Company 170B ([TCDS A-799](https://openairdocs.org/tcds/A-799))

## 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

Part 3 of the Civil Air Regulations.

Install 170 hp Lycoming O-340-A1A engine and Hartzell HC-82XL-1DB/8433-12 propeller according to Doyn data listed on Engineering Releases 100 (3/22/58), 1010 (3/16/57), 1011 (8/28/57), 1012 (7/15/57), 1014 (3/30/57), 1050 (7/13/57), 1051 (& DCN 1, 12/10/57), 1052 (7/19/57), 1053 (7/19/57), 1099 (3/22/58), and Instructions (2 sheets, undated) Data required for parts manufacture: As listed on Engineering Releases 1001 (1/18/57), 1002 (12/21/57), 1003 (5/1/57), 1004 (7/13/57), 1005 (7/12/57), 1006 (3/30/57), 1007 (4/12/57), 1008 (2/27/57), 1009 (10/23/57), 1015 (2/25/56).

FAA Approved Airplane Flight Manual Supplement dated 12/11/56 is required for Model 170A landplane and skiplane, or dated 1/23/57 for 170A or 170B landplane or skiplane; or dated 6/7/57 for Model 1708 seaplane.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

D’Shannon Products, Ltd.

1309 County Road 134 Buffalo, MN 55313 799 Make : Cessna Model : 170A, 170B Date of application :

Date of issuance : December 31, 1956

Date reissued : 1/29/57; 8/23/57; 1/25/66; 5/17/78; 5/12/11;

7/14/11

( Signature) Melvin D. Taylor Manager Atlanta Aircraft Certification Office

( Title)

## Every issue (2)

- July 14, 2011: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/0a/96/0a968e406d9198017b02d5dfa8f4cdf91288cc79f728cf8288be75b5d4955916)
- May 12, 2011: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c6/26/c626cf3e5a52e05669776e1fec0b96f29788ae5ba4aa3c3afd43d4aeace3ac76)

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