NTSB Board Meeting - PowerPoint PPT Presentation

1 / 13
About This Presentation
Title:

NTSB Board Meeting

Description:

During the full-scale test, ... in accordance with its design strength. lateral gust engine failure Several conditions dictate the development of the aerodynamic ... – PowerPoint PPT presentation

Number of Views:110
Avg rating:3.0/5.0
Slides: 14
Provided by: nts99
Learn more at: https://www.ntsb.gov
Category:
Tags: ntsb | board | design | meeting | test

less

Transcript and Presenter's Notes

Title: NTSB Board Meeting


1
Structures Investigation
  • Brian K. Murphy

2
Certification Requirements(Vertical Stabilizer
Loads)
Several conditions dictate the development of the
aerodynamic loads used to design the vertical
stabilizer
  • engine failure
  • lateral gust
  • yawing maneuver

The first officer of flight 587 performed a
maneuver for which the airplane was not
certificated.
3
Certification
  • The vertical stabilizer was designed and
    manufactured in accordance with the applicable
    certification requirements.
  • During the full-scale test, a rear lug fractured
    in tension at nearly twice the design limit load,
    as expected.
  • The analysis and testing done during the
    certification program were valid and complete.

4
Main Attachment Fittings
5
Lug Strength Determination
  • The strength of the lug was determined by
  • finite element analysis
  • progressive failure analysis
  • post accident lug tests

6
Finite Element Analysis of the Lug
FWD
Highest Stressed Region
7
Progressive Failure Analysis
8
Lug Tests
9
Lug Fracture Load Comparison
2.0
Ultimate Load
Limit Load
Normalized Lug Resultant Force
1.0
0.0
Test/Analysis Results
10
Lug Fracture Load Comparison
2.0
Ultimate Load
Limit Load
Normalized Lug Resultant Force
1.0
Certification Test
Lug Test 1
Lug Test 2
Lug Test 3
0.0
Test/Analysis Results
11
Lug Fracture Load Comparison
2.0
Ultimate Load
Limit Load
Normalized Lug Resultant Force
1.0
Certification Test
Lug Test 1
Lug Test 2
Lug Test 3
Flight 587
0.0
Test/Analysis Results
12
Structural Analysis Findings
  • The vertical stabilizer was designed in
    accordance with the applicable certification
    requirements.
  • The right rear lug fractured at a load above
    ultimate load, in accordance with its design
    strength.

13
National Transportation Safety Board
American Airlines Flight 587 Belle Harbor, New
York November 12, 2001 NTSB Board
Meeting October 26, 2004
Write a Comment
User Comments (0)
About PowerShow.com