No installation is complete until the system passes the built-in test (BIT) and a field calibration. The Chelton DF 935-2 PDF devotes an entire chapter to this.
Note: The following is a generalized installation guide based on standard practices for the DF 935 series. Always consult the specific official Chelton Service Bulletin or Installation Manual (IM) for your specific serial number before proceeding. chelton df 935 2 pdf install
The model variant "DF-935-2" signifies a two-channel receiver architecture. Unlike single-channel units that scan sequentially (missing potential signals between sweeps), the dual-channel design allows for: No installation is complete until the system passes
You cannot find this manual on generic free PDF websites. For airworthiness reasons, Chelton/Cobham restricts the full installation manual. Here is your official pathway: chelton df 935 2 pdf install
Authentication requirement: Cobham typically requires you to log in with an authorized dealer or repair station account. If you are a private owner, ask your avionics shop to download the PDF on your behalf. Installing a DF 935-2 is not a DIY homeowner-grade project; it requires an FAA Form 337 or EASA Major Repair/Modification approval.