Aircraft Window Moisture Mitigation via Indicator Desiccant

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Solution Overview

Problem

Laminate-type airplane windshields are prone to moisture ingress, leading to failure over time, and existing sealant solutions fail without providing reliable visual indicators for maintenance, resulting in subjective and inconsistent maintenance intervals.

Innovation Solution

Integration of a moisture-absorbing material into the sealant, combined with an indicator desiccant that provides a visual indication of moisture absorption, such as a color change, to eliminate subjective inspections and enable predictable maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sealant is used to mitigate moisture ingression, then moisture protection is improved, but the sealant fails over time and requires subjective maintenance judgment

Engineering Contradiction:

Improvemoisture protectionVSAvoidsealant service life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies preliminary action by incorporating an indicator desiccant that proactively changes color before the sealant fails, providing advance warning of moisture ingress. This allows maintenance to be performed before complete sealant failure occurs, extending the effective service life and improving reliability of the moisture protection system.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by using a color-changing indicator desiccant that provides visual feedback about the sealant's moisture-blocking performance. The indicator transitions from blue to pink as moisture levels increase, enabling objective monitoring of sealant condition and eliminating subjective maintenance judgment.

Inventive Principle:

Principle #23Feedback

2Ease of operation

If subjective inspection methods are used to assess seal bond quality, then maintenance decisions can be made, but errors in human judgment occur leading to window failures

Engineering Contradiction:

Improvemaintenance assessmentVSAvoidmaintenance accuracy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces the mechanical/subjective human inspection system with a chemical/optical indicator system. The indicator desiccant uses a color change mechanism (blue to pink) that provides objective, unambiguous visual feedback about moisture ingress, eliminating human judgment errors and improving maintenance accuracy while remaining easy to observe.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent directly applies color changes as an indication mechanism. The indicator desiccant contains moisture-absorbing material that changes color from blue to pink when it absorbs moisture, providing a clear, objective visual signal that eliminates subjective inspection and improves maintenance decision accuracy.

Inventive Principle:

Principle #32Color changes

3Device complexity

If traditional sealant without indicator is used, then the structure is simpler, but maintenance intervals are subjective and inconsistent

Engineering Contradiction:

Improvesealant structureVSAvoidmaintenance timing consistency

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The patent uses color changes in the indicator desiccant to provide objective maintenance timing cues. The clear transition from blue to pink creates a universally recognizable signal that eliminates subjective interpretation, ensuring consistent maintenance intervals across different operators and locations while adding minimal complexity to the sealant structure.

Inventive Principle:

Principle #32Color changes

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 solution improves windshield reliability and product life by mitigating moisture ingress and allowing for timely and consistent maintenance, reducing sealant consumption and the risk of window failures.

Implementation Method 1

The indicator desiccant is to absorb penetrating fluid over time and provide a visual indication of an amount of fluid absorbed

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

an indicator desiccant that provides a visual indication of moisture absorption

Methodology Applied

Scientific EffectDesiccant Material: Desiccant Material

Data Source

PatentUS20240400186A1Aircraft window moisture mitigation

Publication Date: 2024.12.05 THE BOEING CO

AI summary

Systems, apparatuses, and methods provide for a window including a window main body, a moisture sealant rim, and an indicator desiccant. The window main body including an interior portion. The moisture sealant rim is coupled to an outer edge area of the window main body to limit moisture penetration into the interior portion. The indicator desiccant is coupled to the moisture sealant rim and located between the moisture sealant rim and the interior portion of the window main body. The indicator desiccant is to absorb penetrating fluid over time and provide a visual indication of an amount of fluid absorbed.