Aircraft Fire Suppression Control Logic

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Solution Overview

Problem

The ban on Halon 1301 due to its ozone-depleting properties has led to the need for alternative fire suppression gases in aircraft that are effective at low concentrations but non-toxic, yet existing alternatives are toxic to humans at effective concentrations.

Innovation Solution

A computing system on an aircraft controls the fire suppression system based on sensors indicating whether the aircraft is on the ground, preventing activation when personnel are present and allowing activation when airborne to prevent exposure to toxic gases.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If alternative inert gases are used to replace Halon 1301, then environmental harm is reduced, but human toxicity increases at effective concentrations

Engineering Contradiction:

Improveozone depletionVSAvoidhuman toxicity

Core Design Contradiction:

Object-generated harmful factorsVSObject-affected harmful factors

Solution Approach 1:

The fire suppression system dynamically adjusts its operation based on real-time detection of personnel presence in the cargo hold. When personnel are detected, the system remains inactive or transitions to inactive state, preventing discharge. When no personnel are present, the system can activate to suppress fires. This dynamic control resolves the contradiction by adapting system behavior to environmental conditions, allowing use of alternative gases that are toxic at effective concentrations but safe when discharge is prevented during personnel presence.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates sensors that continuously monitor the cargo hold for personnel presence and provide feedback to the computing system. This feedback loop enables the system to make informed decisions about whether to activate fire suppression, ensuring that alternative inert gases are only discharged when safe to do so, thus resolving the toxicity concern while maintaining environmental benefits.

Inventive Principle:

Principle #23Feedback

2Reliability

If fire suppression system is activated when personnel are present, then fire safety is improved, but human safety deteriorates due to toxic gas exposure

Engineering Contradiction:

Improvefire suppression effectivenessVSAvoidhuman exposure to toxic gases

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary detection of personnel presence before allowing fire suppression activation. By detecting personnel in advance and preventing system activation when they are present, the system avoids the harmful effect of toxic gas exposure to humans while maintaining the capability to suppress fires effectively when the cargo hold is unoccupied.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The computing system determines aircraft surface status and personnel presence before permitting fire suppression system activation. This preliminary assessment ensures that the system only activates under safe conditions, preventing toxic gas exposure to personnel while maintaining fire safety capability when appropriate.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If fire suppression system remains inactive on surface, then human safety is improved, but fire protection capability is reduced

Engineering Contradiction:

Improvehuman safetyVSAvoidfire protection availability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The fire suppression system dynamically transitions between active and inactive states based on real-time conditions including aircraft surface status and personnel presence detection. The system is permitted to activate when airborne and no personnel are present, while remaining inactive when personnel are present or aircraft is on surface, thus balancing human safety with fire protection availability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes its operational parameters based on detected conditions. When personnel are present or aircraft is on surface, the system parameter transitions to inactive state. When airborne and personnel are absent, the system can transition to active state, allowing fire suppression. This parameter change approach resolves the contradiction by adapting system readiness to environmental safety conditions.

Inventive Principle:

Principle #35Parameter 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

This solution ensures the fire suppression system is only activated when safe to do so, minimizing human exposure to toxic gases and adhering to environmental regulations by avoiding unnecessary discharge of banned or toxic substances.

Implementation Method 1

The inert gas displaces oxygen, which in turn extinguishes any fire

Methodology Applied

Scientific EffectGas displacement: Diffusion

Data Source

PatentUS12115398B2System and method for controlling a fire suppression system of an aircraft

Publication Date: 2024.10.15 THE BOEING CO

AI summary

A method implemented on an aircraft for controlling a fire suppression system comprises receiving, by a computing system of the aircraft, an indication that the fire suppression system of the aircraft should transition to an active state. The computing system determines whether the aircraft is on a surface. Responsive to determining that the aircraft is on the surface, the computing system controls the fire suppression system to remain or transition to an inactive state.