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			 Automakers, regulators and Takata - which supplies one in five air 
			bags globally - have yet to pinpoint why these air bags are at risk. 
			One theory is that moisture in humid climates can make the air bag 
			inflator's chemical mix more volatile, even years after 
			installation. 
			 
			That thinking could be tested later on Thursday as two U.S. Senators 
			have called a news conference with the sister of someone who died in 
			a 2003 accident in Arizona - potentially a sixth fatality linked to 
			Takata air bags. 
			 
			Arizona has a dry climate and has not been covered by a regional 
			recall focusing on hot and humid areas. 
			 
			The Arizona death, and the first official confirmation that a Takata-made 
			air bag killed a Florida woman in October, will likely be raised at 
			a U.S. Senate Commerce Committee hearing, where officials from 
			Takata, Honda Motor <7267.T> and Chrysler <FCHA.MI> will testify. 
			  
			
			  
			 
			The hearing would be the first intensive public airing of Takata's 
			air bag problem in a move reminiscent of congressional grillings 
			Toyota Motor <7203.T> and General Motors <GM.N> executives faced 
			over their recall crises in recent years. 
			 
			Key questions are whether Takata knew of and hid the air bag defects 
			before alerting automakers and regulators; what it has been doing to 
			get to the bottom of the problems; and whether a full nationwide 
			recall is needed. 
			 
			The U.S. National Highway Traffic Safety Administration (NHTSA) this 
			week told Takata and five automakers to expand nationwide the 
			piecemeal regional recalls of driver-side air bags. Takata said it 
			would cooperate if an expanded recall is required, but noted a 
			national recall could divert resources from humid areas where 
			replacement air bags are most needed. 
			 
			Takata and automakers say it will take time to work out how many 
			more vehicles will need fixing - but it could be in the millions. 
			Honda, Takata's biggest customer, alone accounts for 2.8 million 
			cars in the regional recalls covering driver-side air bags to date, 
			across 11 states. A total 4.1 million cars are subject to regional 
			recalls including passenger-side air bags. 
			 
			Since 2008, around 16 million cars with Takata air bags have been 
			recalled worldwide, with more than 10 million of those in the United 
			States. 
			 
			TAKATA INDISPENSABLE - FOR NOW 
			 
			Another question, particularly for drivers, is how quickly Takata 
			can supply replacement parts. 
			 
			In filings with NHTSA on Wednesday, automakers including Honda and 
			Toyota said they were looking into the option of getting air bag 
			inflators from other companies, but most said that would take too 
			long. BMW <BMWG.DE> is backing Takata's efforts to shift inflator 
			production to Germany from Mexico, and said it was not looking 
			elsewhere for supply as it would take two years to approve a new 
			source. 
			 
			
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			Takata recently told analysts it had enough existing and planned 
			capacity to make replacement parts - but that doesn't factor in a 
			nationwide recall. Reuters calculations show it could take five 
			months to make just 1 million inflators on two new production lines 
			planned in Mexico from January, assuming work around-the-clock five 
			days a week. 
			Takata has set aside 77.5 billion yen ($660 million) for recall 
			costs since last year to cover about 9 million vehicles, fewer than 
			the number of cars recalled since 2013. 
			 
			"The American people deserve to know the whole story behind this air 
			bag recall," Senator Bill Nelson, a Democrat from Florida who will 
			chair the congressional hearing, said on Wednesday. "That's why 
			we're holding this hearing to get them some answers and spur 
			automakers to do more to help get these dangerous cars off the road 
			and fixed as soon as possible." 
			 
			Thursday's witness list includes Hiroshi Shimizu, senior vice 
			president of global quality assurance at Takata; Scott Kunselman, 
			Chrysler's senior vice president of vehicle safety and regulatory 
			compliance, Rick Schostek, executive vice president of Honda North 
			America, and Stephanie Erdman, a victim of Takata's air bag defect. 
			David Friedman, NHTSA's deputy administrator, will answer to 
			criticism his agency has been slow to respond to the scandal. 
			
			  
			NHTSA agreed in June to allow automakers to do a regional recall and 
			use their discretion in deciding how and when to notify customers 
			and replace faulty parts, resulting in confusion for car owners 
			receiving mixed messages. 
			 
			President Barack Obama said on Wednesday he was nominating Mark 
			Rosekind, an expert in human fatigue, as the next head of NHTSA. 
			 
			(1 US dollar = 118.1600 Japanese yen) 
			 
			(Additional reporting by TOKYO, DETROIT, NEW YORK and WASHINGTON 
			newsrooms; Editing by Ian Geoghegan) 
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