The Federal Aviation Administration on Friday issued an emergency order instructing airlines with the same type of engine as the one that failed catastrophically on Tuesday on a Southwest Airlines Boeing 737 to more thoroughly inspect the engines’ fan blades.

The agency told airlines to perform ultrasonic inspections — which can detect flaws or cracks not visible to the unaided human eye — within the next 20 days on fan blades of engines with more than 30,000 cycles. A cycle includes an engine start, takeoff, landing and shutdown.

The F.A.A.’s order came shortly after the manufacturer of the engines, CFM International, issued guidelines for the ultrasonic inspections. CFM, a joint venture of General Electric and the French company Safran Aircraft Engines, went further than the F.A.A., recommending that fan blades with 20,000 cycles be inspected by the end of August. It also recommended inspections of all other fan blades when they reach 20,000 cycles, and repeating the inspections every 3,000 cycles, which, it said, “represents about two years in service.”

The F.A.A. said it was acting because it determined that fan blade cracking “is likely to exist or develop in other products of the same type design.”