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Takata Corp., the air-bag supplier behind the industry’s largest-ever recall, routinely manipulated results of air-bag inflator tests reported to Honda Motor Co., according to an ongoing audit commissioned by the parts maker and its biggest customer.

Takata engineers removed some test results to artificially reduce variability in air-bag inflator performance, Brian O’Neill, a former Insurance Institute for Highway Safety president, said in a phone interview. Takata and Honda jointly hired O’Neill to begin the audit in late October, days before Honda first announced findings of data manipulation.

“We have found examples of what I would call selective editing,’ where they have left out results not because they were bad results, but because the results that remained were better,” said O’Neill, whose hiring hasn’t previously been reported. “We found evidence that the report that went to Honda was a shorter version of the original version, and it was a prettier shortened version.”

Findings of pervasive data manipulation and misrepresentations to carmakers could complicate Takata’s efforts to restructure and secure potential buyers following the biggest safety crisis in the auto industry’s history. Takata needs its customers’ backing to help weather costs of recalls that may exceed 100 million air bags worldwide.

The results of the audit will factor in Honda’s investigation into whether it should recall some additional Takata inflators, Chris Martin, a spokesman for the automaker, said by email. The company has already said no new Honda or Acura models under development will be equipped with Takata-supplied inflators.

In one instance, Takata’s manipulation of air-bag inflator test results in 2000 emerged last year as part of a lawsuit against the company on behalf of Patricia Mincey, a Florida woman who became a ventilator-dependent quadriplegic following a low-speed collision in her 2001 Honda Civic. Honda recalled the vehicle four days after the incident in June 2014. Mincey died earlier this year.

Before Takata agreed to settle the Mincey lawsuit last week, several current and former engineers said in depositions that the company also altered and misrepresented test data in reports to Toyota Motor Corp., Nissan Motor Co. and General Motors Co.

Brian Mayville, a Takata engineering manager, said during a deposition taken in November that select reports were not properly represented to Toyota and GM.

Kevin Fitzgerald, an engineer who left Takata in 2014, said he witnessed alteration of test reporting when working on an inflator for Nissan in 2005. During his deposition in February, Fitzgerald said he reported data misrepresentation by fellow engineer Shinichi Tanaka to managers and the company’s lawyers. After telling Fitzgerald corrective action would be taken, the company made Tanaka his boss, he said.

Takata didn’t respond to requests for comment on Fitzgerald’s deposition and didn’t answer whether Tanaka still worked for the company or was available for comment.

Toyota is evaluating the situation, spokesman Itsuki Kurosu said, declining to comment further. Nissan spokesman Nick Maxfield said the company doesn’t comment on matters related to ongoing litigation. GM is closely monitoring the Takata inflator situation using internal and third-party experts, spokesman Tom Wilkinson said.

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