# STC SA12521LA

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Courtney Aviation, LLC, United States
- Holder's repair stations: [7INR751B](https://openairdocs.org/faa-repair-station/7INR751B/courtney-aviation-llc.md) Columbia, CA (OpenAirDocs)
- Description: Demonstration of aircraft critical equipment and antenna systems' tolerance of radio frequency
interference (RFI) from intentional or spurious transmissions from certain Portable Electronic
Devices (PEDs)
- Applied: February 15, 2025
- Product: Aircraft, Small Airplane
- Certification basis: Part 23
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/07/a7/07a717d2c08453537d339a62b7fe83cb4fa580c1d444af9ff27796754606285e
- Approved model list and other attachments: [SA12521LA_AML.pdf](https://openairdocs.org/files/sha256/9d/75/9d7588baa69eb45be6e81d3e15c7deaae77612bbb139f3fbfda095912e370377)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID125369089220261105154411.0001
- DRS record last changed: November 5, 2026
- Page: https://openairdocs.org/stc/SA12521LA

## ADs that name it (0)

None.

## Approved models (4)

- Twin Commander Aircraft LLC 690A ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 690B ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 690C ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft LLC 690D ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## 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.

SA12521LA Courtney Aviation, LLC 10000 Technology Drive Columbia, Ca. 95310 Part 23 Title 14 CFR see FAA approved AML see FAA approved AML see FAA approved AML The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

See Continuation Sheet 3 02/15/2025 11/04/2026 for Manager, West Certification Branch 3 Demonstration of aircraft critical equipment and antenna systems' tolerance of radio frequency interference (RFI) from intentional or spurious transmissions from certain Portable Electronic Devices (PEDs) in accordance with the FAA Approved Compliance Summary Report listed in the AML. See Continuation Sheet 3

SA12521LA 11/04/2026 3

**SA12521LA 11/04/2026 CONTINUATION SHEET 3**

Operated in accordance with FAA Approved Airplane Flight Manual Supplement (AFMS) listed in the AML. Maintained in accordance with FAA Accepted Instructions for Continued Airworthiness (ICA) listed in the AML.

This STC does not constitute installation approval of a wireless radio frequency system using wireless data technologies. It only provides data that may partially support its installation or activation.

Certification Basis:

14 CFR 23.2500(a)(2), Amdt 23-64 14 CFR 23.2510, Amdt 23-64 14 CFR 23.1529, Amdt 23-64 14 CFR 23.2620(a)(5), Amdt 23-64 14 CFR 23.2010(a), Amdt 23-64 3 3 Add Page

### SA12521LA_AML.pdf

FEDERAL AVIATION ADMINISTRATION (FAA) APPROVED MODEL LIST (AML) SA12521LA Demonstration of aircraft equipment and antenna tolerance to PED radio frequency interference .

ISSUE DATE: November 4, 2026

Page 1 of 1

**ITEM AIRCRAFT MAKE**

**AIRCRAFT MODEL**

**ORIGINAL TC NUMBER**

**CERTIFICATION**

**BASIS FOR**

ALTERATION FAA Approved Compliance Summary Report Instructions for Continued Airworthiness

**FAA APPROVED AIRCRAFT FLIGHT**

MANUAL SUPPLEMENT Initial Approval / Amendment Date Drawing Number Revision* Drawing Number Revision* Drawing Number Revision*

1. Twin Commander 690A/B/C/ D 2A4

14 CFR Part 23 with Amendment 23-64 CA.PEDCSR2025A Rev A, dated 10/06/2026 CA.PEDICA2025A

Rev A, dated 10/2/2026

CA.PEDAFMS2025A Rev -, dated 09/15/2026 Initial Approval 11/04/2026

2.

*Or later FAA Approved Revision

FAA Approved:

for Manager, West Certification Branch AMENDED:

ISSUED: November 04, 2026

## Every issue (1)

- Undated: Issued, Current. [certificate](https://openairdocs.org/files/sha256/07/a7/07a717d2c08453537d339a62b7fe83cb4fa580c1d444af9ff27796754606285e), [SA12521LA_AML.pdf](https://openairdocs.org/files/sha256/9d/75/9d7588baa69eb45be6e81d3e15c7deaae77612bbb139f3fbfda095912e370377)

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