Aircraft On-board Maintenance Ethernet Network Segmentation
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Solution Overview
Problem
The bandwidth limitations of existing digital networks, such as ARINC 429, in aircraft systems restrict the transmission of raw data necessary for efficient maintenance, hindering the identification and analysis of equipment malfunctions.
Innovation Solution
An additional Ethernet-based data transmission network is introduced to connect equipment to a processing unit, allowing for real-time data exchange and analysis of malfunctions, using common public software and hardware to simplify development and avoid flight certification constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ARINC 429 digital network is used for transmitting operational data, then flight certification and operational reliability are ensured, but the bandwidth is limited and insufficient for transmitting all raw data from equipment for maintenance analysis
Solution Approach 1:
The patent divides the data transmission system into two separate networks: a first network (ARINC 429) for operational data compliant with flight certification, and a second network (Ethernet-based) for maintenance data transmission. This segmentation allows each network to be optimized for its specific purpose without compromising the other, resolving the contradiction between certification compliance and data transmission capacity.
Solution Approach 2:
The patent introduces a firewall device as an intermediary component between the two networks. The firewall selectively permits or blocks data transmission between the first operational network and the second maintenance network, ensuring that operational data remains certified-compliant while allowing maintenance analysis to access necessary raw data through controlled channels.
2Productivity
If a second Ethernet-based network is introduced for maintenance data transmission, then data transmission capacity and maintenance efficiency are improved, but network complexity increases
Solution Approach 1:
The patent employs Ethernet technology for the second network, which is a universal standard widely used in industrial and consumer applications. This allows the maintenance network to leverage existing hardware, software, and expertise from the broader Ethernet ecosystem, reducing the complexity burden despite adding a new network layer. The firewall device also serves multiple functions including data filtering, security protection, and network isolation.
Solution Approach 2:
The patent creates a parallel maintenance network that mirrors the operational network structure but uses different technology (Ethernet instead of ARINC 429). This copying approach allows the maintenance system to benefit from the same architectural patterns and data flow models while using more capable hardware, thereby improving productivity without proportionally increasing complexity.
3Reliability
If firewalls and data filtering are implemented to prevent data transfer risks, then security and data protection are improved, but data transmission control complexity increases
Solution Approach 1:
The firewall device operates autonomously to make decisions about data transmission based on pre-configured rules and protocols. It automatically filters, permits, or blocks data packets without requiring continuous manual intervention or complex control logic from the main system. This self-service capability provides strong security while keeping the overall system control relatively simple.
Data Source
AI summary
An on-board maintenance system for an aircraft, said aircraft comprising pieces of equipment connected together through a first on-board data transmission network for exchanging operational data intended for piloting the aircraft, said maintenance system including a processing unit and being characterized in that it comprises a second data transmission network, distinct from the first network, for exchanging data intended for maintenance of the equipment of the aircraft, said second network connecting at least some of said pieces of equipment to the processing unit; said processing unit are being adapted for receiving in real time, a data provided by the pieces of equipment on the second network and processing them with view to determining the cause of equipment malfunctions according to at least said received data.