The recall covers trucks from the 2004 through 2006 model years in the US and Canada.
It comes just days after the government announced that a South Carolina man was killed when an inflator exploded in December. Joel Knight, 52, of Kershaw died when he was struck in the neck by metal shrapnel after his 2006 Ranger hit a cow in the road and struck a fence.
The government says automakers will recall another 5 million vehicles equipped with faulty inflators made by Takata Corp. Of Japan. Some of the recalls are because of the crash that killed Knight, with the rest due to air bags failing in lab tests.
Takata uses the chemical ammonium nitrate to cause a small explosion that creates gas and inflates air bags in a crash. But the chemical can deteriorate over time when exposed to high heat and humidity and burn too fast, blowing apart a metal canister designed to contain the explosion.
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Knight is the 10th known death worldwide due to the inflators, and more than 100 people have been hurt. Ford says it will send letters to owners about the recall starting the week of Feb. 22. Although it has some replacement parts available, the company is working with air bag makers to make additional inflators as soon as possible, spokesman John Cangany said.
Knight hit the cow at about 6:20 p.M. On South Carolina Route 522 not far from Columbia. If not for the inflator rupture, the crash would have been moderate and wouldn't have killed him, said Amanda Dotter, spokeswoman for the Elrod Pope Law Firm, which is representing his family.