Ryanair 737 Window Rupture Followed Apparent Engine Fan-Blade Failure

‍THESSALONIKI — A Ryanair Boeing 737-800 window rupture that injured a passenger last week was preceded by an apparent fan-blade failure in the aircraft’s right CFM International CFM56-7B engine, according to reporting by The Air Current.

The aircraft, operated by Ryanair subsidiary Malta Air, was flying from Thessaloniki (SKG), Greece, to Memmingen (FMM), Germany, when it suffered an engine issue and cabin decompression. The aircraft returned safely to Thessaloniki.

Authorities have not yet issued a final finding on the cause of the incident.

Engine Issue Before Decompression

The Air Current, citing people familiar with the accident, reported that an apparent fan-blade failure preceded the rupture of the cabin window.

The Associated Press, citing authorities, reported that the aircraft experienced a right-engine issue and cabin decompression after departure. A 61-year-old passenger seated next to the damaged window suffered injuries after being partially pulled toward the opening before other passengers helped pull him back inside.

The Wall Street Journal reported that debris from the engine struck the aircraft’s fuselage and dislodged the window, causing the sudden decompression.

The aircraft involved was a Boeing 737-800, part of the 737 Next Generation family, not a 737 MAX. The CFM56-7B engine family powers 737NG aircraft worldwide.

NTSB Assisting Investigation

The U.S. National Transportation Safety Board is assisting the investigation, according to the AP, which reported that the inquiry is being led by North Macedonia’s aviation authority because the event occurred in its airspace.

That international structure is typical for an accident or serious incident involving an aircraft registered, operated, or manufactured across multiple jurisdictions. Boeing and CFM International are expected to support the investigation alongside the relevant safety authorities.

Investigators will likely examine the failed engine components, engine maintenance records, fan-blade inspection history, nacelle damage, the window and fuselage strike path, flight data, cockpit voice data, and any recovered debris.

Echoes of Earlier CFM56 Events

The incident will draw close attention because CFM56-7B fan-blade failures have previously caused serious damage on Boeing 737NG aircraft.

In 2018, Southwest Airlines Flight 1380 suffered a left-engine fan-blade failure on a Boeing 737-700. Engine inlet and cowling debris struck the fuselage, breaking a cabin window and causing a fatal decompression event. U.S. investigators later found that the fan blade fractured because of fatigue cracking.

A separate 2016 Southwest Airlines 737-700 incident also involved a CFM56-7B fan-blade failure and significant engine damage, although there were no injuries.

Those earlier cases led regulators to require enhanced inspections of certain CFM56-7B fan blades and related engine components.

Cause Still Under Investigation

The available reporting points to an engine-origin debris event as the likely sequence, but the precise cause remains unconfirmed.

A fan-blade failure can produce severe vibration, engine damage, and debris that may damage the nacelle or surrounding aircraft structure. Whether the Ryanair event involved a contained or partially uncontained failure, how debris reached the fuselage, and why the window structure failed are questions for investigators.

For passengers and airlines, the central safety issue is not simply that a window was damaged. It is whether the failure sequence shows any new weakness in engine inspection, nacelle containment, or fuselage vulnerability — or whether it fits within known risk patterns already addressed by previous directives.

Until investigators publish more detailed findings, the safest conclusion is that the Ryanair aircraft suffered a serious engine-related event followed by a cabin-window rupture and decompression, with the apparent fan-blade failure now a central focus of the investigation.