FAA orders temporary grounding of certain Boeing 737 Max 9 planes after Alaska Airlines window detaches mid-flight

The Federal Aviation Administration said that they will require "immediate inspections of certain Boeing 737 Max 9 planes" after the window on one such plane blew out mid-flight on Friday. 

The FAA's statement, released on Saturday afternoon, said an "Emergency Airworthiness Directive" would be released shortly as well. These directives are issued "when an unsafe condition exists that requires immediate action by an owner/operator," according to the agency. 

This will affect about 171 planes worldwide, the FAA said. Safety inspections for each plane will take between four and eight hours. There have been about 218 such planes delivered around the world, the FAA said, but not all such aircraft were in operation at the time the EAD was issued.