Technical Report on Aircraft Cracked Longeron

Technical Report

For

Aero Structures – Properties & Performance

Version 1.0 approved

Prepared by <enter your name>

<Organization>

<Date created>

Table of Contents

Table of Contents i

Revision History i

1. Repairing a cracked aircraft longeron 1

1.1 Abstract 1

1.2 Introduction 2

1.3 Damage Analysis of the Cracks in Longeron 2

1.4 Conventional Metallic Patch Repair 3

1.5 Bonded/fortified Patch Repair 4

1.6 Repair Design 4

1.7 Testing of the Repair Concept 6

1.8 Inspection of the bonded patch repair 8

1.9 Concluding Remarks 9

1.10 Repair Design Diagrams 10

2. Redesigning the Aircraft Wing 13

2.1 Introduction 13

2.2 How the Structure of an Aircraft being made 14

2.3 Design for Assembly and Manufacturing of Aircraft Wings 15

2.4 Types and Characteristics of Wings Assembly Method 15

2.5 Comparison of Wings Assembly Methods 17

2.6 Selection of Wing Assembly Method 18

2.7 Structural Wing Design & Analysis 18

2.8 Wing Structure (Spar) 19

2.9 Wing Structure (Ribs & Skin) 21

2.10 CFRP Composite Material for Constructing Wing Assembly 22

3. References 24

3.1 Books 24

3.2 Other Sources 24

Revision History

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Repairing a cracked aircraft longeron

A fighter was found with a fatigue crack on one of its longerons, which may eventually lead to a catastrophic failure. So, here in this report some of the techniques and possibilities are discussed as how to repair the cracks on the flange of the wings or longerons and what factors affect the repairing schemes and techniques.

Abstract

A two or three cracks or splits were detected in the flange of the upper left longeron of an aircraft. I first thought of how possible it is to apply the bonded patch repair scheme here instead of metallic patch repair. There are several other patching techniques for example bonded patch repair and the conventional reinforced patch...