Wireless Maintenance Display for Localized LRU Diagnosis

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Solution Overview

Problem

Existing cargo handling systems for aircraft lack efficient and localized maintenance capabilities, particularly for line replaceable units (LRUs) such as power drive units (PDUs) and control panels, which can be distant from centralized maintenance display units.

Innovation Solution

A wireless mobile maintenance display unit (WMMDU) is introduced, equipped with RFID readers for operator and LRU identification, audio/video recording capabilities, and communication modules for real-time data exchange with system controllers or vendors, enabling operators to perform localized inspections and maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If a centralized maintenance display unit is used, then maintenance information can be displayed, but the distance to line replaceable units increases making localized maintenance difficult

Engineering Contradiction:

Improvemaintenance information accessibilityVSAvoiddistance to LRU

Core Design Contradiction:

Loss of informationVSLength of stationary object

Solution Approach 1:

The centralized maintenance display unit is divided into multiple portable wireless maintenance display units that can be distributed throughout the cargo handling system. Each wireless unit can independently communicate with line replaceable units via wireless transceivers, eliminating the need for a single centralized location and enabling localized maintenance at any position in the system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Wireless transceivers act as intermediaries between the portable maintenance display units and the line replaceable units. These transceivers enable communication and data exchange without physical connection, allowing the maintenance unit to access diagnostic information from LRUs at a distance while maintaining real-time connectivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If multiple personnel are required for maintenance tasks, then safety and monitoring are improved, but maintenance time and operational complexity increase

Engineering Contradiction:

Improvemaintenance safetyVSAvoidmaintenance time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The portable wireless maintenance display unit provides self-service capabilities by integrating multiple functions (display, communication, diagnostics, and control) into a single portable device. This allows a single operator to perform maintenance tasks independently without requiring multiple personnel for coordination and monitoring, thereby reducing maintenance time while maintaining safety through comprehensive onboard functionality.

Inventive Principle:

Principle #25Self-service

3Ease of operation

If operators must physically approach LRUs for maintenance, then direct control is improved, but safety risks from moving parts increase

Engineering Contradiction:

Improvedirect control capabilityVSAvoidsafety risks from moving parts

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The wireless transceiver system acts as an intermediary that enables operators to control and monitor line replaceable units from a safe distance. The portable maintenance display unit communicates with LRU controllers wirelessly, allowing operators to perform diagnostics and control functions without physically approaching moving parts, thus eliminating safety risks while maintaining full operational control.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If centralized maintenance monitoring is used, then system-wide oversight is achieved, but response time to localized issues increases

Engineering Contradiction:

Improvesystem monitoring capabilityVSAvoidresponse time to LRU issues

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The centralized monitoring system is segmented into multiple independent portable wireless maintenance display units that can be positioned near different line replaceable units simultaneously. Each unit maintains real-time communication with its associated LRU, enabling immediate detection and response to localized issues while collectively providing system-wide coverage through the distributed network of units.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The WMMDU facilitates immediate identification and diagnosis of LRU issues, reduces maintenance time by allowing a single operator to perform tasks that previously required multiple personnel, and enhances safety by enabling operators to monitor and control LRUs from a safe distance.

Implementation Method 1

the first reader includes at least one of a first radio frequency identification device or a near-field communication device configured to read the identification data unique to the operator

Methodology Applied

Scientific EffectRadio frequency identification: Electromagnetic Induction

Data Source

PatentEP4194335B1Wireless mobile maintenance display unit and system for cargo handling system

Publication Date: 2025.02.12 GOODRICH CORP

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AI summary

A cargo handling system is disclosed. In various embodiments, the system includes a wireless mobile maintenance display unit (360, 460); a line replaceable unit; a data device configured to provide an operational status data concerning the line replaceable unit to the wireless mobile maintenance display unit; a first server configured to store a catalog of parts for repairing the line replaceable unit; and a system controller configured to communicate with a source of replacement parts for the line replaceable unit.