Aircraft Door Alignment System Preventing Binding
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Solution Overview
Problem
Existing door alignment systems fail to prevent binding between doors and their housings, leading to difficulty in opening and closing, particularly in aircraft where structural loads cause distortion and interference, requiring time-consuming inspections and adjustments.
Innovation Solution
A door alignment system comprising a first alignment member secured to a door and a second alignment member secured to a structure or another door, which couple and decouple to prevent binding by maintaining a uniform separation gap when the door is closed, using components like door taps and slot fixtures to ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If doors are installed in aircraft enclosures subject to structural loads, then the doors provide necessary closure and security, but the structural distortion causes door binding and sticking
Solution Approach 1:
The alignment members are pre-installed on the door and housing before the door is subjected to operational loads. These members establish the correct geometric relationship and gap dimensions in advance, preventing binding before it occurs during flight operations
Solution Approach 2:
Alignment members (such as door taps and slot fixtures) are introduced as intermediary elements between the door and housing. These intermediaries maintain the proper separation gap and alignment, mediating the interaction between the door and housing to prevent direct binding even when structural distortion occurs
2Ease of manufacture
If traditional door installation methods are used without alignment members, then the installation process is simpler, but door binding occurs due to lack of precise alignment
Solution Approach 1:
The alignment members are designed to be self-aligning features that guide the door into the correct position during installation. The door taps and slot fixtures work together to automatically establish proper alignment and gap dimensions without requiring complex external alignment equipment or procedures
Solution Approach 2:
The alignment members are pre-configured with specific geometric dimensions and orientations that encode the required alignment information. This preliminary configuration allows installers to achieve precise alignment simply by following the built-in guidance features of the alignment members
3Ease of operation
If manual inspection and adjustment of latches and tie rods is performed to alleviate binding, then door binding can be reduced, but the process is time- and labor-intensive
Solution Approach 1:
The alignment members are designed to automatically maintain proper door alignment and prevent binding throughout the door's operational life. This self-maintaining feature eliminates the need for repeated manual inspections and adjustments of latches and tie rods, significantly reducing maintenance time and labor
Solution Approach 2:
The alignment members establish and maintain correct door geometry and gap dimensions from the moment of installation. This preliminary alignment action prevents binding before it occurs, eliminating the need for subsequent corrective adjustments that would otherwise be required during routine maintenance
Data Source
AI summary
A door alignment system includes a first alignment member secured to one of a first door or a structure connected to the first door, and a second alignment member secured to the other of the first door or the structure. The first alignment member is configured to couple to the second alignment member when the first door is in a closed position relative to the structure in order to prevent the first door from binding in relation to the structure. The first alignment member is configured to be separated from the second alignment member when the first door is in an open position relative to the structure.