Aircraft Door Pressure Flap Locking for Safe Emergency Opening

Solution Overview

Problem

Existing vehicle doors, particularly aircraft emergency exit doors, face challenges in balancing weight, production cost, and ease of operation, with complex locking mechanisms and electrical components complicating production and increasing weight.

Innovation Solution

A door unit with a pressure compensation flap and blocking element that ensures secure closure and easy emergency opening, utilizing mechanical components and a blocking element to prevent unintentional unlocking, and an actuation mechanism to transition between locked and unlocked states without electrical components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If complex locking mechanisms and electrical components are used, then the door can be securely locked, but the weight and production costs increase

Engineering Contradiction:

Improvesecure lockingVSAvoiddoor weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent removes electrical components from the door assembly, extracting the problematic element that caused weight and cost increases. The locking mechanism is simplified to purely mechanical means, eliminating motors, sensors, and control electronics while maintaining secure locking functionality through the blocking element and pressure compensation flap design.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs simple, inexpensive mechanical components such as the blocking element and pressure compensation flap instead of expensive electrical systems. These mechanical parts are designed to be straightforward to manufacture and replace, reducing both initial production costs and long-term maintenance expenses.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If complex locking mechanisms and electrical components are used, then the door can be securely locked, but production costs increase

Engineering Contradiction:

Improvesecure lockingVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent removes electrical components from the door assembly, extracting the problematic element that caused weight and cost increases. The locking mechanism is simplified to purely mechanical means, eliminating motors, sensors, and control electronics while maintaining secure locking functionality through the blocking element and pressure compensation flap design.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs simple, inexpensive mechanical components such as the blocking element and pressure compensation flap instead of expensive electrical systems. These mechanical parts are designed to be straightforward to manufacture and replace, reducing both initial production costs and long-term maintenance expenses.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If the pressure compensation flap is used to prevent pressure buildup, then safety is improved, but the locking mechanism complexity increases

Engineering Contradiction:

Improvepressure safetyVSAvoidlocking mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the pressure compensation function and locking control into a single integrated mechanism. The pressure compensation flap is mechanically linked to the blocking element, so that pressure differential automatically controls the locking state. This merging eliminates the need for separate electrical locking systems while maintaining both pressure safety and secure locking.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pressure compensation flap serves multiple functions: it compensates for pressure differential, controls the blocking element position, and thereby manages the locking state. This multi-functionality reduces the overall system complexity by eliminating dedicated locking components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12546149B2Door unit for a vehicle

Publication Date: 2026.02.10 AIRBUS OPERATIONS GMBH

AI summary

A door unit for an aircraft includes a door which is configured, in a closed position, to cover an opening in the vehicle and to delimit a vehicle interior from a vehicle environment; a pressure compensation flap which is configured, in a sealing position, to cover a pressure compensation opening in the door and, in a pressure compensation position, to at least partially release the pressure compensation opening; a locking element which is configured, in a locking state, to lock the door in the closed position and, in an unlocking state, to unlock the door; and a blocking element which is configured, in the sealing position of the pressure compensation flap, to block a movement of the locking element from the locking state into the unlocking state, wherein the blocking element is arranged on the pressure compensation flap.