# STC SA12187AK

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Momentum Aeronautics Holdings, LLC, United States
- Description: Installation of Momentum Aeronautics Holdings LLC. Model 11600 Amphibious Floats
- Applied: May 14, 2025
- Status date: October 29, 2025
- Product: Aircraft, Small Airplane
- Certification basis: Part 23
- Data sheets: [TCDS A19SW](https://openairdocs.org/tcds/A19SW)
- Certificate PDF: https://openairdocs.org/files/sha256/f8/f4/f8f49666363a8f9e1ed08b7d720578606df852c7db7f5f9e459daba8b689decf
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID190359175420260401210335.0001
- DRS record last changed: April 1, 2026
- Page: https://openairdocs.org/stc/SA12187AK

## ADs that name it (0)

None.

## Approved models (1)

- Air Tractor Inc. AT-802A ([TCDS A19SW](https://openairdocs.org/tcds/A19SW))

## 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.

**14 CFR 21.120)**

FAA Form 8110-2 (10/24) SUPERSEDES PREVIOUS EDITION PAGE 1 OF 3

Number: SA12187AK This certificate issued to:

Installation of Momentum Aeronautics Holdings LLC. Model 11600 Amphibious Floats in accordance with Master Data List 32-600-40-10, Rev. A, dated October 20, 2025, or later FAA approved revision.

1) Compatibility with this design change with previously approved modifications must be determined by the installer.

2) In accordance with 14 CFR 21.25(b)(2) the aircraft must be configured for the special purpose use of forest and wildlife conservation.

3) Aircraft must be equipped with a Pratt & Whitney, Canada PT6A-67F engine.

Momentum Aeronautics Holdings, LLC 500 L Street, Suite 200 Anchorage, AK 99501

Type Certificate Number: A19SW

Make: Air Tractor Inc.

Model: AT-802A

Date of application: May 14, 2025

Date of issuance: October 29, 2025 Date reissued:

for Gregory S. DiLibero Title: Manager, West Certification Branch

Part 23 of the Federal Aviation Regulations.

**14 CFR 21.120)**

FAA Form 8110-2 (10/24) SUPERSEDES PREVIOUS EDITION PAGE 2 OF 3

Number: SA12187AK

Transfer Endorsement Transfer the ownership of Supplemental Type Certificate Number: SA12187AK

**14 CFR 21.120)**

FAA Form 8110-2 (10/24) SUPERSEDES PREVIOUS EDITION PAGE 3 OF 3

SA12187AK

Limitations and Conditions: (Continued)

4) FAA approved Airplane Flight Manual Supplement (AFMS) Doc. No 32-631-25-01, Revision IR, dated October 20, 2025, or later FAA approved revisions, is a required part of this installation.

5) The modified aircraft must be maintained in accordance with the Maintenance Manual and Instructions for Continued Airworthiness, Doc. No. 32-600-24-01, Revision A, dated June 23, 2025, or later accepted revision.

6) Equivalent Level of Safety Findings have been made for the following regulation:

14 CFR 23.49(b)(1)

(documented in ELOS Memorandum ADC-0106-F-1)

Certification Basis:

1) Identical to the certification basis on TCDS A19SW with the following later amendments:

a. § 23.201 and § 23.203 (Amendment 23-62)

b. § 23.207 (Amendment 23-50)

c. § 23.521, § 23.523, § 23.525, § 23.527, § 23.529, § 23.533, and § 23.613 (Amendment 23-45)

2) In accordance with 14 CFR 21.93(b)(3)(ii), the AT-802A that dispenses firefighting materials is exempt from part 36 noise requirements, therefore noise requirements are not included in the certification basis for this STC.

- END -

## Every issue (1)

- October 29, 2025: Issued, Current. [certificate](https://openairdocs.org/files/sha256/f8/f4/f8f49666363a8f9e1ed08b7d720578606df852c7db7f5f9e459daba8b689decf)

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