# STC SA00157IB

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Unity Aviation Canada Ltd., Canada
- Description: Installation of the Cabin Audio System Upgrade
- Applied: November 1, 2023
- Status date: November 28, 2023
- Product: Aircraft, Small Airplane
- Certification basis: Part 23
- Data sheets: [TCDS A9EA](https://openairdocs.org/tcds/A9EA)
- Certificate PDF: https://openairdocs.org/files/sha256/a0/a6/a0a661cc9fc2881858486033ec1210d8d2b29f95ca85061c36cb7a129f4c266d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID185852402520231129204126.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SA00157IB

## ADs that name it (0)

None.

## Approved models (1)

- Viking Air Limited DHC-6-400 ([TCDS A9EA](https://openairdocs.org/tcds/A9EA))

## 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.

IMPORT SA00157IB Unity Aviation Canada Ltd.

291023 Township Rd 270 SE Airdrie, Alberta Canada T4A 2W1 Part 23 Title 14 Code of Federal Regulations A9EA Viking Air Limited DHC-6-400

1. Installation of the Cabin Audio System Upgrade must be in accordance with Avio Design Group Inc.

(Avio dg) Modification Instruction 2355-MI-001, Revision --, dated August 18, 2023, Transport Canada Civil Aviation (TCCA) approved October 2, 2023, or later TCCA approved revision.

2. Maintenance must be in accordance with Avio dg Instructions for Continued Airworthiness 2355-CA-001, Revision --, dated August 18, 2023, or later TCCA accepted revision.

1. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

(See continuation sheet 3) November 1, 2023 November 28, 2023 November 27, 2023

Anthony E. Gallo Manager, International Validation Branch Compliance & Airworthiness Division Aircraft Certification Service 3

**IMPORT SA00157IB SA00157IB 3**

IMPORT SA00157IB Date Reissued: November 28, 2023

Description of Type Design Change (continued):

3. Definition of the Type Design Change is found in Avio dg Master Data List 2355-MD-001, Revision --, dated August 18, 2023, TCCA approved October 2, 2023, or later TCCA approved revision.

2. The installer must determine whether this design change is compatible with previously approved modifications.

3. This STC is applicable to all serial numbers for this Make-Model.

Certification Basis:

Based on title 14 Code of Federal Regulations (CFR) 21.115 and 21.101, and the FAA policy for design changes that are identified as not significant in FAA Order 8110.48, the type certification basis for the modified Viking Air Limited DHC-6-400 is as follows:

a. The type certification basis for the Viking Air Limited DHC-6-400 as shown on Type Certificate Data Sheet (TCDS) A9EA for parts not changed or not affected by the change.

b. The type certification basis for the Viking Air Limited DHC-6-400 for parts changed or affected by the change is TCDS A9EA with the following exceptions:

**14 CFR 23.29, 23.301, 23.303, 23.305, 23.307, 23.337, 23.601, 23.603, 23.605, 23.609,**

23.613 at Amendment 23-1 through Amendment 23-6.

14 CFR 23.1301, 23.1309, 23.1327, 23.1351, 23.1357, 23.1359(c), 23.1365, 23.1431,

23.1529 at Amendment 23-1 through Amendment 23-57.

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## Every issue (2)

- November 28, 2023: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/a0/a6/a0a661cc9fc2881858486033ec1210d8d2b29f95ca85061c36cb7a129f4c266d)
- November 27, 2023: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/5d/cb/5dcbcaa12e3066d146a95267bbd4fcc13391a8ac206e64daab3aac6973b98a54)

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