# GEnx Fan OGV Exemption

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- export is prohibited. 

# May15 th 

# , 20122 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION 

# Agenda

• 14 CFR Part 33.83 Background

• Fan Stator and OGV Description

• Analysis of Structural R edundancy to Support E xemption

• Summary

# 14 CFR Part 33.83 Background4 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION 

### • In order to meet customer operation specification, GE would like increase ground wind operational envelope.

• Fan OGV exceeds 14 CFR Part 33.83(d) material endurance limit requirement for the GEnx

- 1B and 2B under high crosswind conditions with separated inlet airflow.

• Request for Exemption submitted to Federal DMS on April 4, 2012

.

o Written against GEnx

- 2B and GEnx

- 1B78/P2.

o Would like to modify Exemption Request to include all GEnx models.5 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION GEnx

- 2B

- Fan Blade/OGV Aeromechanics Limited



### • GEnx

- 2B unrestricted zone limited to 25 kts due to Fan blade and Fan OGV responses

• Revised GEnx

- 2B Fan blade report supports 

### 30 kts

.

• Exemption on Fan OGV 

### would allow unrestricted zone extension to 30 kts6 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION 

## Fan OGV 33.83 % Limits Overview

Both 1B and 2B exceed endurance limits with high crosswind conditions

• Limits exceeded only during High Crosswind conditions

• No Engine issues when operated within Certified Limits

# Fan Stator and OGV Description8 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION 

## GEnx Fan X

- section

Fan OGV

Fan Hub Frame QEC* Joint

* Quick Engine Change AFT Fan Case/Attachment9 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION 

## Fan Stator Assembly

• Fan OGV Assembly is a highly

r edundant s ystem with multiple load paths

• Each Fan OGV has 4 OD and 4 ID attachment points

• Quantity of OGVs determined by Aero/Acoustics, not structural requirements

Fan OGV’s Fan Hub Frame AFT Fan Case

QEC Joint Forward Engine Mount10 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION FLA

Type 1

Type 6 Nom. Titanium Pylon OGVs
Fwd Engine Mount

• Titanium material capability needed below Fwd engine mount location

– highest loads.

• Balance of OGV’s are of light

- weight aluminum due to lower loads.

Limiting Crosswind OGV11 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION 

## OGV Description

• Multiple Attachment Points extend redundancy

- 4 each at the OD and ID

# OGV Redundancy Analysis

# Worst Case Analysis of Distressed OGV

Footer Load Path Cut in Limiting Area

• Analyzed worst case Loading Condition for any attachment separation.

• Adjacent Ti OGV experienced

m aximum increase of 1.4% Worst Case Distressed OGV Titanium OGVs14 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION T Davis 

# Back

- to Back Analysis Results

Cut Load Path Case Baseline Configuration

Location of 1.4% Increase15 GE Aviation 5/16/2012 GE PROPRIETARY INFORMATION T Davis 

# Summary

• Redundancy of OGV frame validated by analysis.

• Worst Case Engine Testing also confirms redundancy.