Cockpit Door Pressure Sensor for Rapid Decompression
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Solution Overview
Problem
Conventional cockpit door security systems are inadequate for pressurized aircraft cabins, as they can jam during rapid decompression and may trigger false openings due to two-sided pressure measurement systems, which can lead to catastrophic failures and unauthorized access.
Innovation Solution
A one-sided differential pressure sensor with a first pressure port connected directly to the cockpit and a second pressure port connected to a reservoir through a capillary tube with a greater flow restriction, allowing for instantaneous pressure drop detection and direct wiring or signal transmission to enable the cockpit door to open during decompression without measuring pressure across the bulkhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-sided pressure sensor system is used to detect pressure across the bulkhead, then pressure loss can be detected, but false trips can be initiated by individuals on the passenger side, allowing unauthorized cockpit door opening
Solution Approach 1:
The patent extracts the pressure sensing function from a two-sided configuration and implements it on a one-sided basis. The pressure sensor is positioned entirely within the cockpit, with only the pressure port exposed to cockpit pressure. This eliminates the bulkhead penetration and the vulnerability to false trips from the passenger side, while maintaining the ability to detect pressure changes that indicate decompression events.
Solution Approach 2:
The patent introduces a bulkhead penetration seal as an intermediary element that allows the pressure sensor to sense cockpit pressure without creating a direct communication path between the cockpit and passenger cabin. The seal maintains pressure isolation while enabling the sensor to detect decompression events through pressure changes in the cockpit environment.
2Reliability
If conventional latches are used in the cockpit door, then secure locking is achieved, but the latches can jam during rapid decompression, preventing door opening
Solution Approach 1:
The patent implements a feedback mechanism where the pressure sensor continuously monitors cockpit pressure and automatically triggers latch release when decompression is detected. This feedback loop ensures that the door can be opened automatically during rapid decompression events without requiring manual intervention, preventing latch jamming while maintaining secure locking during normal operations.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the pressure sensor and establishing the automatic trigger mechanism before a decompression event occurs. The system is prepared in advance to detect pressure changes and initiate latch release, ensuring that the door can be opened immediately when needed without mechanical jamming or delay.
3Measurement precision
If pressure sensors are positioned to measure across the bulkhead, then pressure differential can be detected, but the system becomes more complex with additional components and noise sensitivity
Solution Approach 1:
The patent extracts the pressure sensing function from a complex two-sided configuration and implements it using a single pressure sensor positioned entirely within the cockpit. This simplification eliminates the need for bulkhead penetration, seals, and additional components, reducing system complexity and noise sensitivity while maintaining the ability to detect pressure changes associated with decompression events.
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 allows for rapid and reliable opening of the cockpit door during decompression events, preventing catastrophic failures and false triggers, while maintaining secure locking during normal conditions, and is designed to be small, inexpensive, and less noise-sensitive with fewer internal components.
Implementation Method 1
a second pressure port connected to a reservoir through a capillary tube with a greater flow restriction
Data Source
AI summary
The invention is directed to a pressure sensor device for sensing decompression in a compartment, such as an aircraft cockpit, and causing a compartment door to be free to open substantially simultaneously in response to the decompression. The pressure sensor comprises a first pressure port and a second pressure port where both pressure ports are open to the compartment, and the second pressure port has a greater flow restriction than the first pressure port, When the pressure sensor is actuated by a difference in pressure between the first pressure port and the second pressure port caused by decompression in the compartment, the pressure sensor sends a signal either via direct wired in series or to a controller to enable movement of a compartment door in response to the decompression.