Helicopter Fuselage Maintenance Step with Pivotable External Mounting
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Solution Overview
Problem
Existing maintenance steps for helicopters are difficult to replace and repair, requiring access from inside the aircraft and increasing maintenance complexity and costs, as they are not easily removable or modular.
Innovation Solution
A maintenance step with a casing integrated into the helicopter's lateral shell, allowing external mounting and dismounting using a pivotable design with coaxial borings and a retaining profile, enabling operation without internal access, and featuring a flat design for reduced space requirements and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If maintenance steps are integrated into the helicopter fuselage using conventional methods, then they provide access for maintenance tasks, but they become difficult to replace and repair requiring access from inside the aircraft
Solution Approach 1:
The maintenance step is divided into separate modular components: a step element, a casing with rearward extension, and mounting pins. This segmentation allows the step to be easily disassembled and replaced from outside the helicopter by simply removing the pins, without requiring internal access or disassembly of the fuselage structure.
Solution Approach 2:
The step is designed with pivotable mounting on pins, allowing it to be dynamically positioned in different angles for maintenance access, and easily rotated or removed when replacement is needed. This dynamic mounting mechanism enables both operational flexibility and easy replacement from external access.
2Ease of operation
If conventional maintenance steps are installed in the helicopter fuselage, then they enable maintenance access, but they increase maintenance complexity and costs
Solution Approach 1:
By segmenting the maintenance step into replaceable modules (step element, casing, pins), the system reduces maintenance complexity. Each component can be independently inspected, replaced, or repaired without affecting the entire assembly or requiring complex internal access procedures.
Solution Approach 2:
The maintenance step design allows ground personnel to perform installation, removal, and replacement operations independently from outside the helicopter using simple tools. This self-service capability eliminates the need for complex internal access procedures and reduces dependency on specialized maintenance equipment or procedures.
3Ease of operation
If traditional maintenance steps are used, then they provide necessary access, but they cannot be easily removed or require removal of internal components
Solution Approach 1:
The maintenance step is designed as a segmented assembly mounted on external pins, allowing the entire step unit to be removed as a complete module from outside the helicopter. This eliminates the need to remove internal carpeting or disassemble fuselage structures, as the step is self-contained and externally accessible.
Solution Approach 2:
The maintenance step is extracted from the traditional integrated fuselage design and positioned as an external, removable component. It is mounted on the outer surface of the helicopter using pins that can be accessed and removed from outside, completely separating the maintenance step from internal fuselage structures.
4Ease of operation
If larger maintenance steps are installed to provide adequate access, then they improve maintenance capability, but they increase weight and reduce space inside the helicopter
Solution Approach 1:
The casing of the maintenance step is constructed from thin-walled, lightweight materials that provide sufficient structural strength and protection while minimizing weight. The thin-walled design allows the step to maintain its functional integrity without requiring heavy reinforcement, thus reducing overall weight while preserving maintenance capability.
5Ease of operation
If larger maintenance steps are used to ensure adequate access, then they improve maintenance capability, but they reduce free space for harness installation inside the helicopter
Solution Approach 1:
The maintenance step is extracted from the internal fuselage volume and positioned as an external component on the helicopter's outer surface. This extraction eliminates the space occupation problem, as the step no longer encroaches on the internal volume available for harness installation and other systems, while still providing the necessary maintenance access capability.
Solution Approach 2:
The maintenance step is relocated from the internal three-dimensional space of the fuselage to the external surface dimension. By moving the step to another dimensional plane (external vs. internal), the design provides adequate maintenance access without consuming valuable internal volume, thus preserving space for harness installation and other systems.
Data Source
AI summary
Maintenance steps on helicopters (10) comprising a casing (1), integrated into a lateral shell of a fuselage of a helicopter (11) for access from outside and a step (2) being pivotably mounted in the casing (1). The invention relates as well to methods for mounting and dismounting of such maintenance steps.