The Federal Aviation Administration has ordered an inspection within 20 days of all engines of the type that disintegrated in midair Tuesday, killing a woman when engine parts shattered the window near her seat.

The FAA mandate requires all airlines to inspect fan blades on certain CFM56-7B engines, which are used on the workhorse Boeing 737 flown by virtually all airlines. The directive is based on a CFM International Service Bulletin issued Friday  and on information gathered from the investigation of Tuesday’s Southwest Airlines engine failure.

The FAA said the inspection mandate applies to CFM56-7B engines that have made 30,000 trips since their last inspection. Those engines must undergo inspections within 20 days. The FAA said General Electric, the engine’s manufacturer, estimates that the corrective action affects 352 engines in the United States and 681 engines worldwide.

Southwest Airlines took the unusual step of announcing it already was complying with the directive, issuing a statement that said:

“Southwest Airlines Co. acknowledges the issuance of Emergency Airworthiness Directive (AD) 2018-09-51 by the Federal Aviation Administration to airlines operating CFM56-7B engines. The existing Southwest Airlines maintenance program meets or exceeds all the requirements specified in the Airworthiness Directive.”

Jennifer Riordan, a 43-year-old bank executive and mother of two from Albuquerque, was killed Tuesday when the engine exploded.