Aircraft Lavatory Trash Compactor With Water-Spray Fullness Control

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Solution Overview

Problem

Aircraft lavatory trash cans fill up quickly, requiring frequent manual inspection and replacement by crew members, leading to hygiene issues and increased workload, and passengers may avoid using the trash cans due to fullness concerns.

Innovation Solution

An aircraft lavatory trash compactor system that includes a controller, sensor, and valve actuator to automatically spray water into the trash can based on trash levels, compacting water-soluble waste and indicating when the bag needs changing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual inspection and replacement of trash bags is used, then trash can fullness can be monitored, but crew workload increases and hygiene issues arise from frequent manual intervention

Engineering Contradiction:

Improvetrash can fullness monitoringVSAvoidcrew workload

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The trash can system performs self-monitoring through sensors that detect trash bag fullness and automatically notify the flight attendant panel, eliminating the need for crew members to manually inspect each trash can. The system serves itself by autonomously detecting and communicating its status.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The manual mechanical inspection process is replaced with an electronic sensing system that uses sensors, wiring, and display panels to automatically detect and communicate trash can fullness, substituting human physical inspection with an automated electronic monitoring system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If trash bags are not changed frequently, then crew workload decreases, but trash overflows causing hygiene issues

Engineering Contradiction:

Improvecrew workloadVSAvoidhygiene issues from overflow

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The system provides real-time feedback to the flight attendant panel when a trash bag reaches fullness, enabling timely replacement before overflow occurs. This feedback mechanism ensures hygiene is maintained while optimizing crew intervention timing.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The sensor detects trash bag fullness in advance before overflow occurs, allowing the crew to replace the bag proactively. This preliminary detection prevents the harmful overflow condition from occurring in the first place.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If no indication system is provided, then device complexity is reduced, but passengers cannot determine trash can status leading to unsatisfied experience

Engineering Contradiction:

Improvepassenger information availabilityVSAvoidindication system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The flight attendant panel uses color-coded indicators (such as green/yellow/red lights) to visually represent trash can fullness status, providing clear passenger and crew information through simple color changes that are easily understood without complex displays.

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The flight attendant panel acts as an intermediary between the trash can sensors and the crew/passengers, translating sensor data into understandable visual indicators. This intermediary simplifies the information transmission while maintaining system functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4269242B1Aircraft lavatory trash compactor

Publication Date: 2026.04.01 BE AEROSPACE INC

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Figure 3A~3B

AI summary

An aircraft lavatory trash compactor is disclosed herein. The aircraft lavatory trash compactor includes a water source (218, 220), a valve actuator (220) connected to the water source (218, 220), a trash can (226) disposed below the valve actuator (220) , and a controller configured to activate the valve actuator (220) to spray water into the trash can (226).