Aircraft Oxygen Simulator Box for In-Place LRU Testing
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Solution Overview
Problem
Conventional methods for troubleshooting aircraft oxygen systems require disconnecting the Line Replaceable Unit (LRU) from the aircraft, leading to a power cutoff that impedes accurate assessment of its functionality.
Innovation Solution
A simulator box that mimics the functionality of the LRU, allowing connection to the aircraft oxygen system via a connection port, controller, and CANBUS for communication, with selectively-activatable indicia and a terminal block for troubleshooting, enabling assessment without power cutoff.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the LRU is disconnected from the aircraft for troubleshooting, then the LRU can be tested independently, but the power supply is cut off which impedes accurate assessment of functionality
Solution Approach 1:
A simulator box is introduced as an intermediary device between the aircraft oxygen system and the LRU. The simulator box includes a connection port that interfaces with the aircraft-side connection of the transmission line, allowing the LRU to remain connected to the aircraft while enabling troubleshooting. The simulator box provides power and communication signals to the LRU through the transmission line, maintaining power supply during testing while allowing independent assessment of LRU functionality.
Solution Approach 2:
The simulator box contains a controller that mimics the functionality of the actual LRU. This copy allows the LRU to be tested without being physically disconnected from the aircraft, as the simulator box replicates the LRU's operational characteristics and power requirements. The controller in the simulator box emulates the LRU's behavior, enabling accurate assessment of LRU functionality while maintaining continuous power supply through the aircraft's transmission line.
2Measurement precision
If the LRU remains connected to the aircraft during troubleshooting, then power supply is maintained, but the LRU cannot be independently tested
Solution Approach 1:
The transmission line is segmented into two distinct connection points: an aircraft-side connection and an LRU-side connection. The simulator box interfaces with the aircraft-side connection, allowing the LRU to be logically separated from the aircraft system for testing purposes while maintaining physical connection. This segmentation enables independent testing of the LRU through the simulator box while preserving the power supply connection to the aircraft.
Solution Approach 2:
The simulator box serves as an intermediary that facilitates independent LRU testing while maintaining power supply. It includes a connection port that attaches to the aircraft-side connection of the transmission line, providing a controlled interface for troubleshooting. The simulator box's controller mimics LRU functionality and provides appropriate power and communication signals, enabling the LRU to be tested independently without disconnecting it from the aircraft.
3Reliability
If conventional troubleshooting methods are used, then the LRU can be identified and addressed, but the process is time-consuming and inefficient
Solution Approach 1:
The simulator box incorporates selectively-activatable indicia that provide visual feedback about the power and communication status between the LRU and the aircraft. This feedback mechanism allows technicians to quickly assess whether the LRU is receiving appropriate power and communication signals, enabling rapid identification of issues. The status indicia provide immediate information about system health without requiring time-consuming manual checking.
Solution Approach 2:
The simulator box contains a controller that replicates the LRU's operational characteristics and power requirements. This copy allows for rapid troubleshooting by simulating various operational states and fault conditions. The controller can be programmed to mimic different LRU behaviors, enabling technicians to quickly identify issues by observing how the simulator responds under various test conditions, significantly reducing troubleshooting time while maintaining accurate issue identification.
Data Source
AI summary
A simulator box for troubleshooting or testing an aircraft oxygen system and associated system and method are disclosed. The simulator box includes a connection port configured to be removably connectable to a transmission line of an oxygen line replaceable unit (LRU). The simulator box also includes a controller configured to mimic functionality of the oxygen LRU. The simulator box further includes a controller area network (CANBUS) configured to facilitate communication between the controller and the transmission line. Additionally, the simulator box includes a plurality of selectively-activatable indicia. Each one of the plurality of selectively-activatable indicia corresponds to one of a plurality of power characteristics. The plurality of selectively-activatable indicia are configured to generate an indicia when a corresponding one of the plurality of power characteristics is receiving a signal from the transmission line.