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DOT/FAA RIN: 2120-AJ51 Publication ID: Fall 2009 
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: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
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  01/00/2010    
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