For those who want the condensed workflow from the chelton df 935 2 pdf install:
The Chelton DF 935-2 is often required for offshore helicopter operations under ICAO Annex 6 and for Civil Air Patrol aircraft. An incorrect installation can cause:
Before closing the aircraft skin, have a second technician verify:
Do not rely on YouTube tutorials or forum posts. The only authoritative source for installing the Chelton DF-935-2 is the official installation PDF. It contains the proprietary connector part numbers (such as MS27472T14F15P), the exact wire gauge (22 AWG twisted shielded), and the legally binding FAA/EASA approval documentation.
By using the precise search term chelton df 935 2 pdf install, you have already demonstrated the correct approach to airworthy avionics maintenance. Secure the document, follow it step by step, and your DF-935-2 will provide reliable, accurate bearings for thousands of flight hours.
Disclaimer: This article is for informational purposes and does not replace the official Chelton/Cobham Aerospace installation manual. Always consult the latest manufacturer documentation and work with a certified avionics technician. Airplane owners, refer to your specific STC paperwork before modifying any aircraft systems.
The Chelton DF 935-2 (part of the 935 Series) is a tactical Direction Finder used primarily in Search and Rescue (SAR) and Combat SAR (CSAR). chelton df 935 2 pdf install
The following information summarizes the core installation and technical requirements found in official Chelton 935 Series Datasheets and related technical manuals. 1. Physical & Mechanical Installation
Mounting Location: Typically installed on the belly of the aircraft for optimal signal reception.
Mounting Attitude: Must be installed in line with the airframe. It can be mounted in either a normal or inverted orientation. Mounting Method: Rigid mounting is required.
Anti-Rotation: The interface includes an anti-rotation feature to prevent twisting or damage during installation/removal. Connectors: Standard connector types are MS3114-16-26P , GB711 5009-1 , or GB711 5009-2. 2. Electrical Requirements
Primary Power: 16.0 to 31.5 V d.c., with a maximum current of 1.6 A.
Interface: Supports RS422 for control via a Chelton Control Display Unit (CDU) or third-party interfaces. It can also output bearing information via ARINC429. 3. Performance & Specifications Frequency Range: 30 MHz to 470 MHz. For those who want the condensed workflow from
Operational Accuracy: Better than 5° rms, though this is highly dependent on the specific installation and aircraft airframe. Dimensions: 286 x 286 x 90 mm (max). Mass: 3.8 kg. 4. Environmental Standards
Altitude: Rated up to 25,000 feet (compliant with EUROCAE ED-14C/RTCA DO-160C Section 4).
Temperature: Continuous operating range from -55°C to +70°C.
Vibration/Shock: Complies with DO-160C standards for fixed-wing (Cat L) and helicopter (Cat Y) platforms. Installation Resources
Detailed modification packages for specific aircraft (like the Airbus AS365) often include mechanical drawings, wiring diagrams, and Instructions for Continued Airworthiness provided by certified shops like MAP Aircraft Part 21.
Do you need specific wiring diagrams or the pinout configuration for the MS3114-16-26P connector? 935 Series Tactical DF Antenna | Chelton Before closing the aircraft skin, have a second
Specification. Electrical Specs Mechanical Specs Standard Specs. 30 Minimum Frequency. 470 Maximum Frequency. 16.0 to 31.5 V d.c., Chelton 935 Series Tactical DF Antenna | Chelton
Because the Chelton DF935 is an older legacy unit (often found in retrofit situations), the "installation" process is typically divided into two phases: Physical Installation and Configuration/Calibration.
Here is a feature overview and an installation guide based on standard aviation practices for this type of equipment.
Before beginning the installation, gather the following:
The "DF 935-2" is not just a standalone box; it is an integrated direction finding system consisting of:
Why is the PDF installation guide critical? Unlike a VOR or GPS, a DF system relies on precise phase matching of signals arriving at multiple antennas. A misalignment of 1 centimeter or a cable cut error can lead to bearing errors of 10 degrees or more—sending a rescuer miles off course.