Segmented Aircraft Cowl Fairing for Wider Maintenance Opening

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Solution Overview

Problem

The existing design of aircraft cowls limits accessibility to propulsion assembly equipment due to restricted pivoting angles, and spacing the secondary lateral fairing from the primary structure compromises aerodynamic performance.

Innovation Solution

The secondary lateral fairing is divided into two movable parts with a pivot axis, allowing for increased pivoting angles and preventing contact with the primary structure, thus enhancing accessibility while maintaining aerodynamic continuity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the secondary lateral fairing is spaced apart from the primary structure to increase pivoting angle, then accessibility is improved, but aerodynamic performance deteriorates

Engineering Contradiction:

Improveaccessibility to propulsion assembly equipmentVSAvoidaerodynamic performance

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The secondary lateral fairing is divided into two separate parts: a fixed part attached to the primary structure and a movable part attached to the cowl. This segmentation allows the movable part to pivot with the cowl for improved accessibility, while the fixed part remains attached to maintain aerodynamic continuity, thus resolving the contradiction between accessibility and aerodynamic performance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fixed part of the secondary lateral fairing acts as an intermediary element that maintains aerodynamic continuity between the primary structure and the movable part. This intermediary structure ensures that even when the movable part pivots to increase accessibility, the overall aerodynamic profile is preserved

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the secondary lateral fairing is integrated with the primary structure to maintain aerodynamic continuity, then aerodynamic performance is improved, but pivoting angle is restricted

Engineering Contradiction:

Improveaerodynamic performanceVSAvoidaccessibility to propulsion assembly equipment

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

By segmenting the secondary lateral fairing into fixed and movable parts, the invention allows the movable part to pivot independently with the cowl, thereby increasing the pivoting angle and improving accessibility while the fixed part maintains aerodynamic continuity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces dynamic capability to the secondary lateral fairing by making part of it movable relative to the primary structure. This allows the fairing to adapt its configuration: maintaining aerodynamic continuity when needed and providing increased accessibility when the cowl needs to be opened

Inventive Principle:

Principle #15Dynamics

3Ease of repair

If the cowl pivoting angle is increased to improve accessibility, then ease of maintenance is improved, but the risk of contact with primary structure increases

Engineering Contradiction:

Improveaccessibility to propulsion assembly equipmentVSAvoidrisk of contact between secondary lateral fairing and primary structure

Core Design Contradiction:

Ease of repairVSReliability

Solution Approach 1:

Segmenting the secondary lateral fairing into fixed and movable parts allows the movable part to pivot with the cowl for improved accessibility, while the fixed part remains stationary and attached to the primary structure, preventing contact and maintaining reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fixed part serves as an intermediary that prevents direct contact between the movable secondary lateral fairing and the primary structure, thereby reducing the risk of damage while allowing greater pivoting angles for improved maintenance accessibility

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enables cowls to pivot through angles greater than 65°, improving access to propulsion assembly equipment without compromising aerodynamic performance.

Implementation Method 1

Each articulation 30 comprises a pivoting connection having a pivot axis A30 substantially parallel to the longitudinal direction

Methodology Applied

Scientific EffectPivoting connection: Hinge

Data Source

PatentUS12503242B2Aircraft comprising at least one cowl having two parts movable relative to each other

Publication Date: 2025.12.23 AIRBUS OPERATIONS (SAS)

AI summary

An aircraft comprising at least one propulsion assembly and at least one pylon, the propulsion assembly comprising at least one cowl, connected by at least one first articulation to a fixed support, comprising a curved main part and a secondary lateral fairing which is positioned in the extension of a main lateral fairing of the pylon when the cowl is in the closed position. The secondary lateral fairing comprises at least first and second parts movable relative to each other, the first part being connected to the main part of the cowl.