# STC ST09933AC - Type: Supplemental type certificate - Status: Current, Reissued - Holder: L2 Aviation, United States - Description: Expansion of parameters in the digital flight data acquisition unit (DFDAU) - Applied: May 4, 2022 - Status date: September 14, 2026 - Product: Aircraft, Large Airplane - Certification basis: Part 25 - Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE) - Certificate PDF: https://openairdocs.org/files/sha256/60/c9/60c923ebf2e03460c09e19ebfc7e0f5f2b320ce98bdafef2a73a0d8b8a31a6a5 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID165000351820260925160722.0001 - DRS record last changed: September 25, 2026 - Page: https://openairdocs.org/stc/ST09933AC ## ADs that name it (0) None. ## Approved models (2) - The Boeing Company 737-700 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE)) - The Boeing Company 737-800 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE)) ## 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. ST09933AC L2 Aviation 82 Comair Blvd Erlanger, KY 41018 Part 25 the Title 14, Code of Federal Regulations A16WE The Boeing Company 737-700, 737-800 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) 05/04/2022 11/22/2024 09/14/2026 01/06/2023 for Jason S. Deutschman Acting Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 4 Expansion of parameters in the digital flight data acquisition unit (DFDAU) in accordance with L2 Consulting Services, Inc., Master Data List 3135-B131-MDL, Revision H, dated December 22, 2022, or later FAA approved revision. ST09933AC 09/14/2026 4 ST09933AC 09/14/2026 Limitations and Conditions (Continued): Instructions for Continued Airworthiness (ICA), L2 Consulting Services, Inc. Document 3135-B131-ICA, Rev. A, dated November 28, 2022, or later FAA accepted revision must be made available to the operator at the time of installation. Certification Basis: Based on 14 CFR §21.115 and 21.101, and FAA policy for How to Establish the Certification Basis for Changed Aeronautical Products in FAA Order 8110.48, the certification basis for the Boeing 737-700/-800 series is as follows: a. The certification basis for Boeing Model 737-700/-800 Series airplanes is shown on Type Certificate Data Sheet (TCDS) A16WE for parts not changed or not affected by the change. b. The certification basis for parts changed or affected by the change since the reference date of applications, May 4, 2022, is based upon part 25 as amended by Amendment 25-77 and 14 CFR part 26. Based on 14 CFR §21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for this modification was determined to be: Regulations per Type Certificate Data Sheet A16WE (amendments 25-1 through 25-77, plus exceptions in the TCDS): 14 CFR §25.869(a)(4) [Amdt 25-72]; 25.899 [Amdt 25-123]; 25.981(a)(3) [Amdt 25-146]; 25.1301(a)(b)(c)(d) [Amdt 25-0]; 25.1309(a)(b)(d) [Amdt 25-41]; 25.1353(a)(b) [Amdt 25-42]; 25.1431(a)(c) [Amdt 25-0]; 25.1529 [Amdt 25-54]; 25.1541(a)(1)(b) [Amdt 25-0] ST09933AC 09/14/2026 Certification Basis (Continued): 14 CFR Part 26 regulations Based on 14 CFR §21.101(g), applicable provisions of 14 CFR part 26 are included in the certification basis. For any future 14 CFR part 26 amendments, the holder of this STC must demonstrate compliance with the applicable sections. As of the issuance date of this STC, compliance has been found for the following regulations 14 CFR §26.11(c)(1)(2) - amendment 26-7 -END- 4 4 ## Every issue (3) - September 14, 2026: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/60/c9/60c923ebf2e03460c09e19ebfc7e0f5f2b320ce98bdafef2a73a0d8b8a31a6a5) - November 22, 2024: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/8b/3d/8b3d259765dc26143e36b7e186e629779a4446d7038241edd77a87e416e3be06) - January 6, 2023: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/4d/ed/4ded6d1fc8c7c195a4a2127b6a20a9d3370c1a93c1e3dc8f957fb322c7c22eba) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.