FDR Synchronization and Timing Module Subassembly
A multi-component assembly of crystal oscillators, GPS sync boards, and timing controllers for precise timestamping in flight data recorders. It is covered by HTS 8543.90.35.00 due to its fastened parts designed exclusively for FDR time synchronization.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If general electrical subassemblies
Non-specialized electrical assemblies default to other 'parts thereof' in 8543.90.
If for geopositioning systems outside FDR
Timing modules for surveying or navigation instruments classify under heading 9015.
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Import Tips & Compliance
• Include atomic clock equivalence certifications if applicable; check for EAR99 classification; provide assembly diagrams for customs review
Related Products under HTS 8543.90.35.00
Flight Data Recorder Processor Assembly
This subassembly integrates the central processing unit, memory modules, and signal conditioning circuits for a flight data recorder (FDR). It falls under HTS 8543.90.35.00 as it consists of two or more parts fastened together specifically for FDR use, enabling real-time data acquisition from aircraft sensors.
FDR Data Acquisition Unit Subassembly
A joined assembly of analog-to-digital converters, multiplexers, and interface boards designed for flight data recorders to capture parameters like altitude and speed. Classified under 8543.90.35.00 due to its multi-part construction tailored for FDR functionality in aircraft black boxes.
Flight Data Recorder Crash-Survivable Memory Module Assembly
This ruggedized subassembly combines solid-state memory chips, protective enclosures, and mounting hardware for FDRs to retain data post-crash. It qualifies for HTS 8543.90.35.00 as a fastened multi-part unit dedicated to flight data recording in high-impact environments.
FDR Interface and Power Supply Subassembly
An integrated unit of power regulators, ARINC 429 interfaces, and connectors joined for flight data recorders to ensure stable operation from aircraft power buses. Falls under 8543.90.35.00 for its specific multi-part design for FDR systems.
Flight Data Recorder Sensor Input Board Assembly
Subassembly featuring signal amplifiers, filters, and input terminals fastened together for processing aircraft sensor data in FDRs. Classified in HTS 8543.90.35.00 as it meets the criteria for joined parts dedicated to flight data recorder assemblies.
Flight Data Recorder Enclosure and Mounting Assembly
Joined crash-proof housing, shock mounts, and retention brackets forming a protective subassembly for FDR internal components. Qualifies under 8543.90.35.00 as parts fastened for flight data recorder integration in aircraft.