jet while it was an altitude of 16,000 feet. that's around 4,900 meters. incredibly the plane made a successful emergency landing and there were injuries but none of them serious. now, after the alaska airlines emergency, the u.s. federal aviation administration temporarily grounded certain boeing 737 max 9 aircraft operated by u.s. airlines or in u.s. territory. the faa says 171 planes worldwide are affected. cnn's pete munteen now reports boeing once again facing scrutiny over this incident. >> reporter: a major new development following this incident. the federal aviation administration is now issuing an emergency air worthiness directive. essentially an emergency recall calling for a temporary grounding of these boeing 737 max 9 airplanes pending the results of inspections. this incident happened in an