# STC SE3553NM

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Johnston Aircraft Svc, Inc, United States
- Description: Modification of crankshaft damper configuration
- Applied: November 25, 1986
- Status date: December 10, 1986
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1E4](https://openairdocs.org/tcds/1E4)
- Certificate PDF: https://openairdocs.org/files/sha256/4a/bb/4abbd46c44eae1c708103e0b76c79f616f833313f5315ebfed400b27c4833584
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6E71C509C86D989E85256CC2005A752E.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE3553NM

## ADs that name it (0)

None.

## Approved models (1)

- Lycoming Engines IO-540-C1B5 ([TCDS 1E4](https://openairdocs.org/tcds/1E4))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

810 3 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SE3553NM This certificate issued to: Johnston Aircraft Service, Inc.

'Part 13 & the Civil Air Piyululious! effective June 15, 1956, as amended by 13-1, 13-2 and 13-3.

Original Product -Iype bartificate Lumber. 1E4

• Matie Lycoming

• Mertel IO-540-C1B5 December 10, 1986 or later FAA approved revision. "corne with FAN Saled on soon.

the basic engine of the specified model that is otherwise unmodified. Limitations and Conditions: The approval of this change in type design applies to approval should not be extended to other specific 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 modifications will introduce no adverse effect upon the airworthiness of that engine.

Date of Application: November 25, 1986 Lute reiasued:

Tute sfissuance: December 10, 1986 Late unended:

FEDERAL AVIATIO By divotion of the Aldering Creter Sawin t Kammelett POMINISTRANOT *AR Manager, Western Aircraft Certification Office (Title) 47

## Every issue (1)

- December 10, 1986: Issued, Current. [certificate](https://openairdocs.org/files/sha256/4a/bb/4abbd46c44eae1c708103e0b76c79f616f833313f5315ebfed400b27c4833584)

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