# STC ST04574AT - Type: Supplemental type certificate - Status: Current, Issued - Holder: Avionics Support Group Inc. - Description: Installation of the Avionics Support Group Constant Friction Mount (cfMount) and Cradle - Status date: November 20, 2023 - Data sheets: T00021SE, T00021SE, T00021SE - Certificate PDF: https://openairdocs.org/files/sha256/49/eb/49eb8a27dca6609222bc0815ae31c7a7e0369db5496687167be7f9e659fa4033 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID193341328820231128164348.0001 - Page: https://openairdocs.org/stc/ST04574AT ## ADs that name it None. ## Approved models (3) - The Boeing Company 787-10 (TCDS T00021SE) - The Boeing Company 787-8 (TCDS T00021SE) - The Boeing Company 787-9 (TCDS T00021SE) ## 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. Title: (for) Christina M. Underwood Manager, East Certificate Branch Compliance and Airworthiness Division Aircraft Certification Service ST04574AT Avionics Support Group, Inc. 13155 SW 132 Avenue Miami, FL 33186 25 the Federal Aviation Regulations T00021SE The Boeing Company 787-8, 787-9 & 787-10 Series Installation of the Avionics Support Group Constant Friction Mount (cfMount) and Cradle in accordance with Master Data List (MDL) 219274-MDL, Rev IR, dated March 14, 2022, or later FAA approved revision. (See Continuation Sheet 3 of 4) March 4, 2022 November 20, 2023 4 ST04574AT 4 ST04574AT Limitations and Conditions - cont.: 1. The installer must determine whether this design change is compatible with previously approved modifications. 2. 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. 3. Instructions for Continued Airworthiness (ICA) document 219274-ICA Rev IR, dated March 14, 2022 or later FAA Approved revision must be made available to the operator at the time of installation. ST04574AT Certification Basis: 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 the Boeing 787-8/-9/-10 series aircraft is as follows: a. The type certification basis for Boeing 787-8/-9/-10 airplane is shown on TCDS T00021SE 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 application, March 4, 2022, is based upon part 25 as amended by Amendment 25-143. 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 at the latest amendment 25-0 through 25-143 § 25.29 § 25.301 § 25.303 § 25.305 § 25.307 § 25.561 § 25.601 § 25.603 § 25.605 § 25.609 § 25.611 § 25.613 § 25.773 § 25.789 § 25.853 § 25.1301 § 25.1309 § 25.1529 § 25.1541 Regulations at an intermediate amendment None Regulations at the amendment level in TCDS T00021SE None --------------------------END--------------------------- 4 4 ## Every issue (1) - November 20, 2023: Issued, Current. [certificate](https://openairdocs.org/files/sha256/49/eb/49eb8a27dca6609222bc0815ae31c7a7e0369db5496687167be7f9e659fa4033) --- From OpenAirDocs.org, an independent open copy of FAA data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.