# STC ST12412CH - Type: Supplemental type certificate - Status: Current, Reissued - Holder: IFL Group Inc., United States - Description: Installation of the Dual FreeFlight Systems RA-6500 Radio Altimeter - Applied: October 1, 2025 - Status date: July 9, 2026 - Product: Aircraft, Large Airplane - Certification basis: Part 25 - Data sheets: [TCDS A3WE](https://openairdocs.org/tcds/A3WE) - Certificate PDF: https://openairdocs.org/files/sha256/b4/a7/b4a7288d911cafef382d076619b1076ec6480e9ee367c680f7eee30075ac4b9a - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID198607516020260803165734.0001 - DRS record last changed: August 3, 2026 - Page: https://openairdocs.org/stc/ST12412CH ## ADs that name it (0) None. ## Approved models (6) - The Boeing Company 727 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-100 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-100C Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-200 Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727-200F Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) - The Boeing Company 727C Series ([TCDS A3WE](https://openairdocs.org/tcds/A3WE)) ## 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. ST12412CH IFL Group Inc. 6860 South Service Drive Waterford, MI 48327 Part 25 Title 14 Code of Federal Regulations A3WE The Boeing Company See Continuation sheet 3 of 3 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 must give the other person written evidence of that permission. October 1, 2025 July 9, 2026 June 23, 2026 Jason S. Deutschman Acting Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Services 3 Installation of the Dual FreeFlight Systems RA-6500 Radio Altimeter system in accordance with Dan Buzz & Associates LLC, Master Data List Document No. DB2510001 Revision C, dated June 11, 2026, or later FAA approved revision. (See Continuation sheet 3 of 3 for complete Description of Type Design Change) for: ST12412CH 07/09/2026 3 ST12412CH 07/09/2026 Model (Continued): 727 Series, 727-100 Series, 727C Series, 727-100C Series, 727-200 Series, 727-200F Series Description of Type Design Change (Continued): The aircraft must be maintained in accordance with Instructions for Continued Airworthiness, document number DB2510004 Revision IR, dated December 5, 2025, or later FAA accepted revision. FAA Approved Airplane Flight Manual Supplement DB2510003, Revision IR, approved June 16, 2026, for FreeFlight Systems RA-6500 Radio Altimeter, or later FAA approved revision is required on board the modified aircraft. 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 Company 727 Series, 727-100 Series, 727C Series, 727-100C Series, 727-200 Series, 727-200F Series aircraft is as follows: a. The type certification basis for The Boeing Company 727 Series, 727-100 Series, 727C Series, 727-100C Series, 727-200 Series, 727-200F Series aircraft is shown on TCDS A3WE for parts not changed or not affected by this change. b. The certification basis for the parts changed or affected by this change since the reference date of application, October 1, 2025, is based on TCDS A3WE and the following: 14 CFR Part 25/26 Regulations at the amendment level: 14 CFR §§ 25.301(a) [25-00], 25.303[25-00], 25.305(a) [25-00], 25.307(a) [25-00], 25.561(c) [25-00], 25.601 [25-00], 25.603(a)(b) [25-00], 25.609(a) [25-00], 25.611 [25-00], 25.613(a)(d) [25-00], 25.1301 [25-00], 25.1309(a)(b)(e)[25-00], 25.1351 (a)(1) [25-00], 25.1353(a) [25-00], 25.1357(a)(c) [25-00], 25.1431 (a)(c) [25-00] , 25.1501 [25-00], 25.1529 [25-54], 25.1581 [25-00], 25.1583(e) [25-00], 26.11(c)(1)(2) [26-7] ---------------------------------------------------- END ------------------------------------------------------- 3 3 Add Page ## Every issue (2) - July 9, 2026: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b4/a7/b4a7288d911cafef382d076619b1076ec6480e9ee367c680f7eee30075ac4b9a) - June 23, 2026: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/9e/f7/9ef7309781718f968810c844e0029c61e9d0c116e97b3d7d848d9c50e7a0a28d) --- 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.