# STC SA456NW

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Kenmore Air Harbor LLC, United States
- Description: Installation of auxiliary vertical seaplane fins
- Applied: May 27, 1977
- Status date: March 28, 2024
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS A-806](https://openairdocs.org/tcds/A-806)
- Certificate PDF: https://openairdocs.org/files/sha256/e9/e6/e9e6d88a466c0724f5019c6794c52e0bb3b5fdef4854680c6952985f61b3bd8c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID166804169620240403132855.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA456NW

## ADs that name it (0)

None.

## Approved models (1)

- Viking Air Limited DHC-2 Mk.I ([TCDS A-806](https://openairdocs.org/tcds/A-806))

## 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.

SA456NW Kenmore Air Harbor, LLC 6321 NE 175th Street Kenmore, WA 98028 Part 10 the Civil Air Regulations A-806 Viking Air Limited DHC-2 Mk I Auxilliary vertical seaplane fins installed and maintained in accordance with Kenmore Air Harbor, LLC Installation Instructions document K8819, Revision A, or later FAA-approved revision.

Note 1: These fins are mounted as end plates to the outboard end ribs of the horizontal stabilizers and replace the standard de Havilland ventral fin.

Note 2: These fins do not need to be removed if the airplane is converted to a landplane.

Note 3: The certification basis of the model DHC-2 is equivalent to Part 3 of the Civil Air Regulations, dated November 13, 1945.

Approval of this change in type design applies to the above aircraft model only. This approval should not be extended to aircraft on which other previous alterations are incorporated unless it is determined that the relationship between this alteration and any other alterations will not introduce any adverse effect upon the airworthiness of the aircraft. This approval is extended to the above aircraft with EDO model 679-4930 floats installed in accordance with STC SA1913WE. A copy of this certificate shall be maintained as part of the permanent records for the modified aircraft.

If the holder agrees to permit aother person to use this certificate to alter a product, the holder shall provide the other person written evidence of that permission.

May 27, 1977 April 5, 2019 June 2, 1977 March 4, 1980, March 28, 2024 for Manager, West Certification Branch

SA456NW

## Every issue (3)

- March 28, 2024: Amended, Current. [certificate](https://openairdocs.org/files/sha256/e9/e6/e9e6d88a466c0724f5019c6794c52e0bb3b5fdef4854680c6952985f61b3bd8c)
- April 5, 2019: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/85/6b/856bfe0b579a5e8294daf21f80c12fa7f17c828a7e98a9ed690e58ee88580b2f)
- March 4, 1980: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/a6/8f/a68fc82429d3d718b6da5f127d37816cd82c573c6b88245d690d98d79426889b)

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