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DOT/FAA RIN: 2120-AK24 Publication ID: Fall 2016 
Title: Transport Airplane Fuel Tank and System Lightning Protection (RRR) 

This rulemaking would amend certain airworthiness regulations for transport category airplanes regarding lightning protection of fuel tanks and systems by establishing design requirements for both normal conditions and possible failures of fuel tank structure and systems that could lead to fuel tank explosions, adding new maintenance requirements related to lightning protection features, and imposing specific requirements for airworthiness limitations in the instructions for continued airworthiness. It would also create performance-based standards for prevention of catastrophic fuel vapor ignition caused by lightning by regulating the risk due to both ignition sources and fuel tank flammability. This change would allow designers to take advantage of flammability reduction technologies whose effectiveness was not foreseen when earlier revisions to these rules were written. This change would also relieve some of the administrative burdens created by the current regulations.

Agency: Department of Transportation(DOT)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 14 CFR 25   
Legal Authority: 49 U.S.C. 106(g)    49 U.S.C. 40113    49 U.S.C. 44701 to 44702    49 U.S.C. 44704   
Legal Deadline:
Action Source Description Date
Final  Statutory  Final  07/18/2016 
Action Date FR Cite
NPRM  12/18/2014  79 FR 75496   
NPRM Comment Period End  03/18/2015 
Final Rule  05/00/2017 
Additional Information: SB: N, IC: N, SLT: N Anticipated costs and benefits: The total combined savings would be about $610 million or $451 million present value at a 7 percent discount rate. The lower and the higher estimates of the total combined regulatory savings would be between $384 million and $836 million ($283 million and $618 million present value at a 7 percent discount rate, respectively). This RIN is related to 2120-ZA06. Progress status: NPRM in FAA coordination.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL:   Public Comment URL:  
RIN Data Printed in the FR: No 
Agency Contact:
Massoud Sadeghi
Department of Transportation
Federal Aviation Administration
1601 Lind Avenue SW.,
Renton, WA 98055