# STC SE2364NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Snohomish Flying Svc Inc, United States
- Description: Modification to lower horsepower rating from 118 H.P. at 2800 RPM to 115 H.P. at 2800 RPM for takeoff and 115 H.P. at 2700 RPM to 108 H.P. at 2600 RPM for maximum continuous.
- Applied: December 27, 1983
- Status date: June 13, 1984
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS E-223](https://openairdocs.org/tcds/E-223)
- Certificate PDF: https://openairdocs.org/files/sha256/21/11/2111e4aac7adb574dc111b1ec276be17cd36a1ab6c6b49bf82dd1c733001f348
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/68BF6741443CA6EE85256CC2005A74BB.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE2364NM

## ADs that name it (0)

None.

## Approved models (1)

- Textron Lycoming AVCO Corporation O-235-L2C ([TCDS E-223](https://openairdocs.org/tcds/E-223))

## 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: SE236ANM This certificate issued to: SNOHOMISH FLYING SERVICE, INC.

Part 13 of the Civil Air Regulations dated June 15, 1956 as amended by 13-1, 13-2, and 13-3.

Original Product - Type bertificate Number: E-223-16 Make: Lycoming Model: 0-235-L2C Description of Type Design Change: Modification of a Iycaning 0-235-12C engine to lower the horsepower rating from 118 H.P. @ 2800 RPM to 115 H.P. @ 2800 RPM for takeoff, and 115 H.P. @ 2700 RPM to 108 H.P. @ 2600 RPM for maximm continuous in accordance with Snohomish Flying Service, Inc. Installation Instruction Drawing No. DH 84001-1, dated April 9, 1984, or later FAA approved revisions.

NOTE: The modified engine shall be designated as 0-235-L2C-M.

Limitations and Conditions: Approval of this change in type design applies basically to the above model engine only. This approval should not be extended to other engines of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any of those other previously approved moditications, including changes in type design, will introduce no adverse effect upon the airworthiness of that engine. A copy of this Certificate and Addendum No. SE2364NM shall be maintained as part of the permanent records for the modified engine.

Date of Application: December 27, 1983 Date Reissued:

Date of Issuance: June 13, 1984 Date Amended:

FEDERAL AVIATION By Direction of the Administrator Acting Manager, Seattle Aflat Certification CHINIST RATION Office (Title)

47.

**FAA FORM B110-2 (10-68)**

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SE2364NM June 13, 1984 Supplemental Type Certificate ADDENDUM NO. SE2364NM The conditions and limitations of Type Certificate Data Sheet E-223-16 apply, except where superseded by the following:

Supplemental Type Certificate Data Sheet, which is part of SIC SE2364NM prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Supplemental Type Certificate HOLDER: Snohomish Flying Service, Inc.

Engine: Lycaming Fuel: 80/87 minimum grade aviation gasoline Engine Limits: 115 H.P. @ 2800 RPM for takeoff (5 minutes) and 108 H.P. @ 2600 RPM for maximum continuous Compression Ratio: 6.75:1 Ignition Timing, °BTC 25° Placards: Placards and Operating Limitations on Type Certificate Data Sheet E-223-16 apply, except as noted herein:

a. Original Engine Data Plate:

Add "SEE SUPP. DATA PLATE" on lower line of the plate. Change Spark Advance from 20° to 25° by crossing out 20° and stamping in 25°.

**FAA FORM 8110-2-1 (10-69) PAGE 3 OF 4 PAGES C FAA AC 73-2651**

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SE236ANNS Limitations and Conditions: (continued): June 13, 1984

b. Supplemental Engine Data Plate:

Install a Supplemental Data Plate on the right hand side of oil sump to read as follows:

**SNOHOMISH FLYING SERVICE, INC.**

SUPPLEMENTAL DATA PLATE STC SE2364NM Lycaming 0-235-12C-M Takeoit: (5Min.) 115 H.P. @ 2800 RPM Normal Rated: 108 H.P. @ 2600 RPM Spark Advance: 25° BTDC Fuel: Min. Grade Aviation Gasoline 80/87 END

**FAA FORM 8110-2-1 (10-69) PAGE 4 OF 4 PAGES C FAA AC 73-2651**

## Every issue (1)

- June 13, 1984: Issued, Current. [certificate](https://openairdocs.org/files/sha256/21/11/2111e4aac7adb574dc111b1ec276be17cd36a1ab6c6b49bf82dd1c733001f348)

---
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.