Floatable Control Buoy for Remote Life Raft Activation
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Solution Overview
Problem
Current life raft systems for aircraft, particularly rotary wing aircraft, pose challenges in safely and reliably activating the life raft after ditching, as occupants must navigate unsteady aircraft and water conditions to reach manual release handles, risking injury and difficulty in deploying the raft.
Innovation Solution
A life raft system featuring a floatable control buoy that can be activated remotely, allowing occupants to inflate the life raft from a safe distance, independent of the aircraft, using an electrical switch and deployable connection line, which is automatically triggered by water immersion sensors, enhancing safety and survivability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If occupants manually reach and operate the external release handle to deploy the life raft, then the life raft can be deployed, but occupants risk injury from unsteady aircraft movements and wave conditions
Solution Approach 1:
The system separates the life raft deployment function from the aircraft structure by using a floatable control buoy that operates independently in the water. The buoy contains the activation mechanism and is positioned away from the aircraft, allowing occupants to deploy the life raft without approaching the hazardous aircraft area.
Solution Approach 2:
The floatable control buoy serves as an intermediary device between the occupants and the life raft inflation system. It receives activation signals from occupants in the water and triggers the inflation device remotely, eliminating the need for direct contact with the aircraft or manual handling of the life raft.
2Ease of operation
If occupants approach the aircraft to reach the external release handle, then they can activate the life raft, but their mobility is limited by dry suits and life preservers
Solution Approach 1:
The system transitions from a three-dimensional approach where occupants must physically reach the aircraft structure to a two-dimensional surface operation where the floatable control buoy floats on the water surface. Occupants can activate the life raft from any position around the buoy without needing to climb or reach upward toward the aircraft.
3Reliability
If the life raft is deployed close to the aircraft, then it provides immediate flotation, but it may hit and injure swimming occupants during deployment
Solution Approach 1:
The floatable control buoy is activated and positioned in the water before the life raft inflation begins. This preliminary positioning allows occupants to move to a safe distance from the deployment zone while the life raft inflates, eliminating the risk of being struck by the deploying raft while maintaining immediate flotation availability.
4Ease of operation
If the external release handle is installed on the lower fuselage, then it can release the life raft, but it may be located over or under the water surface making it difficult to reach
Solution Approach 1:
The floatable control buoy utilizes buoyancy force to counteract gravity and remain positioned on the water surface rather than sinking. This ensures the activation mechanism remains constantly accessible to occupants in the water regardless of wave conditions, eliminating the problem of the handle being submerged or unreachable.
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 system significantly increases safety and survivability by allowing remote activation of the life raft, reducing the risk of injury from the aircraft and enabling deployment without approaching the capsized aircraft, thus improving overall safety and mobility for occupants in emergency situations.
Implementation Method 1
The control unit comprises a floatable control buoy with an activation member that is operable for activating the inflation device. The floatable control buoy is provided for operation at a predetermined distance remote from an associated aircraft in an emergency mode.
Implementation Method 2
an inflation device for inflating the inflatable life raft in an emergency mode
Data Source
AI summary
A life raft system for an aircraft, comprising a storage container; an inflatable life raft that is stored in the storage container in normal operation mode, an inflation device for inflating the inflatable life raft in an emergency mode, and a control unit for activating the inflation device in the emergency mode; wherein the control unit comprises a floatable control buoy with an activation member that is operable for activating the inflation device, wherein the floatable control buoy is provided for operation at a predetermined distance remote from an associated aircraft in an emergency mode.