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DOT/FAA RIN: 2120-AJ51 Publication ID: Fall 2010 
Title: Fatigue Tolerance Evaluation of Metallic Structures 
Abstract: This rulemaking would address advances in the fatigue tolerance evaluation safety requirements for transport category metallic structures. This action is necessary to avoid or reduce catastrophic fatigue failures. The intended effect is increased safety requirements and harmonization with international standards. 
Agency: Department of Transportation(DOT)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 14 CFR 29   
Legal Authority: 49 USC 106(g)    49 USC 40113    49 USC 44701    49 USC 44702    49 USC 44704   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  03/12/2010  75 FR 11799   
NPRM Comment Period Extended  05/05/2010  75 FR 24501   
NPRM Comment Period End  06/10/2010    
NPRM Comment Period Extended  07/30/2010    
Next Action  To Be Determined    
Additional Information: Prompted by The Aviation Rulemaking Advisory Committee (ARAC) recommends to change the fatigue evaluation requirements for transport rotorcraft found in 14 CFR 29.571, which would improve understanding.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
International Impacts: This regulatory action will be likely to have international trade and investment effects, or otherwise be of international interest.
RIN Information URL: www.regulations.gov   Public Comment URL: www.regulations.gov  
RIN Data Printed in the FR: No 
Agency Contact:
Sharon Miles
Regulations and Policy Group
Department of Transportation
Federal Aviation Administration
2601 Meacham Blvd.,
Fort Worth, TX 76137
Phone:817-222-5122
Email: sharon.y.miles@faa.gov