# STC SA12083IB

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: MT-Propeller Entwicklung GmbH, Germany
- Description: Installation of the Avia Propeller Ltd. model V508H/108/A propeller
- Applied: March 25, 2025
- Status date: July 23, 2025
- Product: Aircraft, Small Airplane
- Certification basis: Part 23
- Foreign approvals: EASA STC 10086020, Revision 0, dated December 9, 2024
- Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW)
- Certificate PDF: https://openairdocs.org/files/sha256/40/b3/40b3fcdfc8a3fb650aa5523a35eabce9cc065d4bc1f56428ba6c6e9e66b3c0fb
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID122678159320250723161524.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA12083IB

## ADs that name it (0)

None.

## Approved models (6)

- Air Tractor Inc. AT-402 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-402A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-402B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-502 ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-502A ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))
- Air Tractor Inc. AT-502B ([TCDS A17SW](https://openairdocs.org/tcds/A17SW))

## 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 SA12083IB MT-Propeller Entwicklung GmbH Flugplatzstrasse 1 94348 Atting Germany Part 23 Title 14 Code of Federal Regulations A17SW Air Tractor, Inc.

AT-402, AT-402A, AT-402B, AT-502, AT-502B, AT-503A

1. Installation of the Avia Propeller Ltd. model V508H/108/A propeller on the Air Tractor, Inc. AT-402, AT-402A, AT-402B, AT-502, AT-502B, and AT-503A aircraft must be in accordance with MT-Propeller Entwicklung GmbH Master Documentation List, Doc # E-4385, Revision 2, dated April 29, 2025, and Installation Instructions, Doc # E-4388, Revision 0, dated December 2, 2024 or later European Union Aviation Safety Agency (EASA) accepted revisions.

1. This Supplemental Type Certificate (STC) is applicable to all serial numbers for these Make-Models.

(See continuation sheet 3) March 25, 2025 July 23, 2025 John Yoo Manager, International Validation Branch Compliance & Airworthiness Division Aircraft Certification Service 3

**IMPORT SA12083IB 3**

IMPORT SA12083IB Date Issued: July 23, 2025

Description of Type Design Change (continued):

2. Maintenance must be in accordance with MT-Propeller Entwicklung GmbH Instructions for Continued Airworthiness, Doc. # E-4389, Revision 1, dated December 2, 2024, or later EASA accepted revisions.

3. Operations must be in accordance with MT-Propeller Entwicklung GmbH's Airplane Flight Manual Supplement and Pilots Operating Handbook Supplement, Doc # E-4387, Revision 2, dated April 29, 2025, or later EASA approved revisions.

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

3. 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.

4. The aircraft must be operated in accordance with the Limitations sections of the Airplane Flight Manual Supplement and Pilots Operating Handbook Supplement referenced in the Description section.

5. The aircraft must be maintained in accordance with the Airworthiness Limitations section of the Instructions for Continued Airworthiness referenced in the Description section.

6. Operation of the aircraft is limited for the special purpose use of agricultural spraying, dusting, and seeding and for the special purpose use of forest and wildlife conservation (fire fighting) per title 14 CFR 21.25(b)(1) and 21.25(b)(2); including the special purpose of Drug Eradication in accordance with CFR 21.25(b)(7) for the application of herbicide.

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## Every issue (1)

- July 23, 2025: Issued, Current. [certificate](https://openairdocs.org/files/sha256/40/b3/40b3fcdfc8a3fb650aa5523a35eabce9cc065d4bc1f56428ba6c6e9e66b3c0fb)

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