Flight Deck Door Decompression Venting Mechanism

Solution Overview

Problem

Aircraft cockpit doors face challenges in balancing space efficiency with the need to accommodate decompression events, as traditional hinged doors occupy significant space, while sliding pocket doors do not respond adequately to transverse forces during decompression.

Innovation Solution

A door assembly with a locking mechanism featuring a deadbolt and hinge blocking assembly that allows the door to transition from a sliding to a swinging open position in response to decompression, utilizing a curved deadbolt and angular locking bracket configuration to secure and release the door panel effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a hinged swinging door is used, then the door can respond to decompression events and provide an open air passageway, but the door occupies much space within the limited space of the aircraft

Engineering Contradiction:

Improvedecompression response capabilityVSAvoidspace occupied by door

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The door assembly utilizes a pocket door configuration where the door panel nests within a recessed opening in the bulkhead when opened, rather than swinging outward. This nesting arrangement allows the door to be space-efficient during normal operation while still enabling full opening capability for decompression events.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The locking mechanism incorporates a decompression venting feature that allows the door to dynamically transition from a locked closed position to an open position in response to decompression forces. The system adapts its state based on environmental conditions, maintaining security during normal operation while automatically opening when needed.

Inventive Principle:

Principle #15Dynamics

2Volume of moving object

If a sliding pocket door is used, then space efficiency is improved, but the door does not respond to move to an open position during decompression events

Engineering Contradiction:

Improvespace occupied by doorVSAvoiddecompression response capability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The locking mechanism incorporates a decompression venting feature that allows the door to dynamically transition from a locked closed position to an open position in response to decompression forces. The system adapts its state based on environmental conditions, maintaining security during normal operation while automatically opening when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The locking mechanism is designed with decompression venting capability that preemptively addresses the decompression threat by allowing the door to open in response to pressure differential, preventing potential damage from uncontrolled decompression forces acting on a sealed door.

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If the deadbolt is positioned to block lateral movement, then the door remains secure, but the door cannot be opened during decompression events

Engineering Contradiction:

Improvedoor securityVSAvoidresponse to different operational conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The locking mechanism incorporates a decompression venting feature that allows the door to dynamically transition from a locked closed position to an open position in response to decompression forces. The system adapts its state based on environmental conditions, maintaining security during normal operation while automatically opening when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The locking mechanism responds to changes in pressure differential across the door by adjusting the engagement state of the deadbolt and locking bracket. Under normal conditions, the parameters maintain full engagement for security; during decompression, the pressure differential causes parameter changes that disengage the locking components.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11667369B2Flight deck security pocket door decompression venting and crew escape system

Publication Date: 2023.06.06 THE BOEING CO

AI summary

A locking mechanism for a door panel to be positioned within and out of blocking relationship with an opening. Mechanism includes a deadbolt rotatably connected to the wall and having a curved configuration and a locking bracket connected to the door panel. The locking bracket extends from the door panel in an angular direction with respect to a plane of door panel. With door panel in a closed position and deadbolt in a first position, the locking bracket extends through the curved configuration. Deadbolt is in blocking relationship with the locking bracket in a direction along a plane of the door panel and is not in blocking relationship in a direction along the locking bracket. With door panel in closed position, deadbolt is in a second position not in blocking relationship with the locking bracket permitting door panel to move in a direction along a plane of the door panel.