# STC ST11104SC

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: L2 Aviation
- Description: Installation of an Iridium Communications System
- Status date: June 12, 2025
- Data sheets: A20WE, A20WE
- Certificate PDF: https://openairdocs.org/files/sha256/8c/90/8c9029c048a66c594274010de4c46a5b50f8a604736a6f08adb71cd37d00d19d
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID181134896220250625151755.0001
- Page: https://openairdocs.org/stc/ST11104SC

## ADs that name it

None.

## Approved models (2)

- The Boeing Company 747-400 Series (TCDS A20WE)
- The Boeing Company 747-400F Series (TCDS A20WE)

## 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.

ST11104SC L2 Aviation 2100 E Hwy 290 Dripping Springs, TX 78620 Part 25 the Federal Aviation Regulations A20WE The Boeing Company 747-400 Series, 747-400F Series 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 a product, the holder must give the other person written evidence of that permission.

(See Continuation Sheet 3 of 4) 10/20/2011 06/12/2025 10/24/2012 for Paul Nguyen Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 4 Installation of an Iridium Communications System in accordance with L2 Consulting Services, Inc. Master Drawing List 2325-B66-MDL, Rev. B, dated October 1, 2012, or later FAA approved revision.

FAA 8110-2 ( 10/24) Page 2 of __

ST11104SC 06/12/2025 4

ST11104SC 06/12/2025 Limitations and Conditions (Continued):

1. FAA Approved Flight Manual Supplement, L2 Consulting Services, Inc. Document 2325-B66-AFM, Rev. IR, Dated October 22, 2012 or later FAA approved revision is required onboard the modified aircraft.

2. Instructions for Continued Airworthiness (ICA), L2 Consulting Services, Inc. Document 2325-B66-ICA, Rev. IR, Dated September 19, 2012 or later FAA accepted revision must be made available to the operator at the time of installation.

Note: The FAA has reviewed the applicant's assessment showing that this modification does not impact the existing electrical wiring interconnection system instructions for continued airworthiness (EWIS ICA) and found that no additional EWIS ICA tasks are required.

Certification Basis:

The Certification Basis for this installation is per Type Certificate Data Sheet A20WE, plus the following:

Regulations that meet amendment level 25-72

25.29(a), 25.307(a), 25.625(a), 25.1307(c), 25.1351(a), 25.1581

Regulations that meet amendment level 25-102

25.981(a)(3),(b)

Regulations that meet amendment level 25-105

25.1583, 25.1585

Regulations that meet amendment level 25-112

25.613(a),(b),(c) 3 4

ST11104SC 06/12/2025 Certification Basis (Continued):

Regulations that meet amendment level 25-113

25.1431(a),(b),(c),(d)

Regulations that meet amendment level 25-123

25.611, 25.869(a)(4), 25.1301(a), 25.1309(b),(c),(d),(e), 25.1357(a),(c)

Regulations that meet amendment level 26-0

26.11

-END- 4 4

## Every issue (2)

- June 12, 2025: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8c/90/8c9029c048a66c594274010de4c46a5b50f8a604736a6f08adb71cd37d00d19d)
- October 24, 2012: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/03/f8/03f8b0e621874c214bcf0bb0bc86b77bcab7c83580f13d079d02b619e1620491)

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