Regulations & Safety
Mount Etna 2025 Eruption Case Study in Volcanic Monitoring
Analysis of Mount Etna’s Strombolian eruption highlights INGV’s monitoring systems and aviation safety protocols that prevented disruptions.

Mount Etna’s June 2025 Strombolian Eruption: A Case Study in Volcanic Monitoring and Aviation Safety
Mount Etna, Europe’s tallest and most active volcano, erupted once again on June 2, 2025, showcasing the unpredictable and powerful nature of Strombolian activity. This eruption, while not catastrophic, serves as a significant reminder of the importance of continuous volcanic monitoring and rapid communication with aviation authorities. Characterized by explosive bursts, an ash plume, and a pyroclastic flow, the event prompted a temporary red alert under the Aviation Color Code system, signaling immediate risk to air traffic.
Located on the eastern coast of Sicily, Italy, Mount Etna has long been a focal point for volcanologists and emergency response teams. With a history of frequent eruptions, the volcano is closely monitored by the Italian National Institute of Geophysics and Volcanology (INGV), which plays a critical role in issuing timely alerts. The June 2025 eruption, although short-lived, highlighted the effectiveness of modern volcanic surveillance systems and the continuing need for vigilance in regions prone to geological hazards.
This article explores the eruption’s timeline, the science behind Strombolian activity, the implications for aviation, and the broader lessons for global volcanic risk management.
The Eruption Timeline and Scientific Context
Volcanic Tremor and Eruption Onset
Seismic precursors began to emerge late on June 1, 2025, when a gradual increase in volcanic tremor amplitude was detected starting around 22:00 UTC. By 00:50 UTC on June 2, tremor levels had reached high values, with the centroid localized near the Southeast Crater at approximately 2.8 km elevation. Infrasonic activity, another key indicator, also showed a rise starting around 00:30 UTC.
At 01:50 UTC, visible Strombolian activity was observed, characterized by intermittent, explosive ejections of incandescent material. The INGV responded swiftly by escalating the Aviation Color Code from Green to Yellow at 01:23 UTC, Orange at 02:02 UTC, and Red at 03:32 UTC. This sequence of alerts was based on real-time monitoring of seismic and visual data, which confirmed explosive activity and an increasing seismic amplitude.
Despite initial satellite imagery not detecting ash, a cloud composed mainly of water vapor and sulfur dioxide (SO₂) was observed drifting southwest. By 06:59 UTC, the Toulouse Volcanic Ash Advisory Center (VAAC) reported a weak ash plume reaching 5.5 km (18,000 feet), moving at approximately 20 km/h.
“The in volcanic in volcanic tremor was a clear precursor to the Strombolian eruption we observed early June 2. Our monitoring systems allowed us to quickly raise the aviation alert, minimizing risks to air traffic,” Dr. Salvatore Lo Giudice, INGV
Pyroclastic Flow and Lava Fountain
At 09:24 UTC, INGV surveillance cameras captured a pyroclastic flow on the northern flank of the Southeast Crater. Preliminary assessments indicated the hot material did not extend beyond the Valle del Leone, limiting the immediate threat to nearby communities. Simultaneously, the eruption escalated into a lava fountain, a more intense form of eruptive activity.
Volcanic tremor and infrasonic activity remained elevated, with deformation data from the DRUV station showing continued variation. However, other monitoring networks did not indicate significant ground deformation, suggesting that the activity was largely confined to the summit area.
By 09:18 UTC, the Aviation Color Code was raised to Red once again due to the intensifying eruption. The volcanic cloud height was estimated at 6.5 km (21,300 feet), drifting west-southwest. Social media footage showed dramatic scenes of ash columns and people evacuating nearby observation areas, although no casualties were reported.
Implications for Aviation and Public Safety
Aviation Disruption and Risk Management
Volcanic ash poses a serious threat to aviation, capable of damaging jet engines and impairing visibility. The International Civil Aviation Organization (ICAO) has established global protocols for issuing volcanic ash advisories, which rely heavily on real-time data from ground-based and satellite monitoring systems.
During the June 2025 event, the swift elevation of the Aviation Color Code to Red demonstrated the effectiveness of these protocols. Although no commercial flights were reported to be directly affected, the alert served as a precautionary measure, reducing the risk of ash ingestion by aircraft operating in the region.
Historically, volcanic disruptions have had significant economic impacts. For example, the 2010 Eyjafjallajökull eruption in Iceland resulted in estimated airline losses of $200 million per day at its peak. While the Etna eruption was not on the same scale, the potential for disruption underscores the importance of preparedness and coordination among aviation stakeholders.
Public Communication and Emergency Response
One of the key takeaways from the event was the role of transparent and timely communication. INGV’s updates, paired with visual evidence from surveillance cameras and satellite data, enabled local authorities to keep the public informed without inciting panic.
Despite the pyroclastic flow and ash emissions, there were no reports of injuries or property damage. This outcome reflects both the localized nature of the eruption and the effectiveness of Etna’s hazard zoning, which restricts public access to high-risk areas near the summit.
Social media also played a role in real-time information dissemination. Videos and images captured by observers helped convey the scale of the eruption to the public and media, reinforcing the importance of community engagement in hazard awareness.
“Mount Etna’s activity remains a significant concern for both local populations and aviation. The prompt detection of eruptive signals and communication with aviation authorities is crucial to preventing ash-related incidents,” Professor Jane Smith, University of Cambridge
Conclusion: Lessons from Etna and the Path Forward
The June 2, 2025 eruption of Mount Etna serves as a textbook example of how modern monitoring systems and coordinated response protocols can mitigate the risks posed by active volcanoes. From the initial detection of volcanic tremor to the issuance of aviation alerts and the containment of public exposure, the event illustrates the value of preparedness and scientific vigilance.
Looking ahead, the increasing frequency of volcanic activity at Etna and other global hotspots highlights the need for continued investment in monitoring infrastructure, data sharing, and public education. As climate and geological systems evolve, the ability to anticipate and respond to natural hazards will remain a cornerstone of resilience for communities and industries alike.
FAQ
What is a Strombolian eruption?
A Strombolian eruption is a type of volcanic activity characterized by short-lived, explosive bursts that eject incandescent cinders, ash, and lava bombs.
Why was the Aviation Color Code raised to Red?
The Red alert was issued due to explosive activity and ash emissions that posed a potential hazard to aircraft flying near the volcano.
Was anyone injured during the eruption?
According to official reports, there were no injuries or casualties resulting from the eruption on June 2, 2025.
Sources
- INGV
- ICAO
- European Commission
- University of Cambridge Volcanology Department (2025)
Photo Credit: NPR
Regulations & Safety
NTSB Preliminary Report: Ryanair 737-800 Engine Failure
NTSB confirms fan-blade-out on Ryanair 737-800 shattered cabin window, partially ejecting a passenger during climb from Thessaloniki.

This is a developing story. Information may change as official details are released.
This is original reporting and analysis by AirPro News.
On August 13, 2026, the National Transportation Safety Board (NTSB) issued its preliminary report on a July 10 uncontained engine failure aboard a Ryanair Boeing 737-800, confirming that a fan-blade-out event shattered a cabin window and caused a rapid decompression. The incident resulted in a 61-year-old male passenger being partially pulled through the shattered window before being secured by fellow passengers.
The event occurred during climb out from Thessaloniki International Airport (SKG) in Greece. The flight, operated by Ryanair subsidiary Malta Air, was bound for Memmingen, Germany (FMM). The NTSB is currently investigating potential similarities between this event and a fatal 2018 engine failure, while the agency has also publicly addressed premature speculation regarding the cause by Ryanair leadership.
Flight 1879 rapid decompression
According to the NTSB preliminary report, the Boeing 737-800 was climbing when the right-hand CFM56-7B engine experienced a fan-blade-out event. Debris from the engine struck the fuselage and shattered a window at row 11. The resulting rapid decompression pulled a passenger partially outside the aircraft. The passenger sustained neck and shoulder injuries as well as friction burns, but no fatalities occurred.
Reporting by The Air Current indicates the failure happened at an altitude of approximately 15,000 feet. Passengers described a sudden and violent disruption to the flight. A passenger told AP News that the cabin was quiet before a loud noise resembling a bursting tire occurred, adding that they knew immediately the aircraft had lost pressure due to the sudden loss of altitude.
Initial reports following the July 10 incident suggested the failure occurred in the airspace of the Republic of North Macedonia. However, flight path analysis confirmed the event took place in Greek airspace. The Hellenic Air and Rail Safety Investigation Authority officially delegated the investigation to the NTSB on July 16, 2026.
Maintenance history and preliminary findings
The NTSB preliminary report notes that bird remains were found inside the damaged engine. Flight crews had reported four suspected bird strikes to the aircraft’s number two engine in the 12 months preceding the accident. The report states that bird remains were found in two of those previous cases.
Maintenance records indicate that the fan blades on the failed right engine underwent ultrasonic inspections in November 2025 and May 2026. No damage was found during either inspection. The official cause of the July 10 failure remains under investigation by the NTSB, with participation from the Federal Aviation Administration (FAA), Boeing, and CFM International, a joint venture between GE Aerospace and Safran.
Regulatory protocols and historical precedent
The investigation has generated friction between the NTSB and Ryanair regarding public communications. On August 7, 2026, NTSB Chair Jennifer Homendy issued a letter to Ryanair CEO Michael O’Leary after he told investors the investigation was focused on foreign object damage rather than aircraft age or maintenance. Homendy stated that the NTSB had made no such determination and noted that O’Leary’s comments violated International Civil Aviation Organization (ICAO) Annex 13 protocols governing accident investigations.
The aviation industry is closely monitoring the investigation due to the aircraft and engine types involved. The Air Current reported that the event closely mirrors the April 2018 Southwest Airlines flight 1380 uncontained engine failure, which also involved a Boeing 737-700 and a CFM56-7B engine. That incident resulted in one passenger fatality after a shattered window caused partial ejection, leading the FAA to mandate engine inlet redesigns by July 2028.
The NTSB addressed the historical context directly in its preliminary report:
The investigative team is aware of previous … events with similar engine models that resulted in damage to engine inlets or cowlings and fuselage structures. Determination of any relevant similarities or details between this accident and previous events remains under investigation.
AirPro News analysis
We observe that the public rebuke of a major airline CEO by the NTSB is a rare and significant enforcement of ICAO Annex 13 communication protocols. Operators typically defer entirely to the investigating authority to avoid compromising the integrity of an active probe. The NTSB’s swift correction underscores the agency’s zero-tolerance policy for operator speculation, particularly when an event involves high-profile safety concerns like uncontained engine failures.
The CFM56-7B is one of the most widely used commercial aviation engines in the world. Any investigation involving a fan-blade-out event on this powerplant will naturally draw intense regulatory scrutiny, especially given the precedent set by the 2018 Southwest Airlines accident. While the discovery of bird remains introduces foreign object damage as a variable, we expect investigators will rigorously examine the efficacy of the ultrasonic inspections conducted in November 2025 and May 2026 to understand how the blade failure propagated.
Sources: National Transportation Safety Board
Photo Credit: NTSB
Regulations & Safety
FAA Installs New Surface Radar at Newark Airport
The FAA unveiled a new SMR-4 radar at Newark Liberty as part of a $30 million infrastructure upgrade targeting runway safety.

U.S. Transportation Secretary Sean P. Duffy and Federal Aviation Administration (FAA) Administrator Bryan Bedford unveiled a new Surface Movement Radar-Systems Model 4 (SMR-4) at Newark Liberty International Airport (EWR) on August 11, 2026, replacing a 30-year-old legacy system.
The installation is part of a broader $30 million infrastructure upgrade at the New Jersey hub designed to prevent runway incursions and reduce delays. According to the FAA press release, the SMR-4 allows air traffic controllers to track aircraft and ground vehicles across runways and taxiways in all weather and visibility conditions.
Newark’s infrastructure modernization
The $30 million funding allocation for EWR spans a three-year period and targets critical technological vulnerabilities. During the summer of 2025, the Airports experienced severe delays that prompted the FAA to deploy Software patches, expedite fiber deployment, and rebalance flight volumes. To date, 90% of the airport’s legacy copper wiring has been replaced with high-speed fiber.
“Since the start of this administration, we have been working towards building a modern system that will serve America’s skies for generations,” Duffy stated. “From replacing Newark’s ancient copper wire to investing $30 million into new infrastructure and bringing new radar online, we are delivering real safety and efficiency enhancements at one of our nation’s busiest airports.”
The FAA has set a target deadline of summer 2027 for EWR to install new electronic information displays, upgraded voice switches, and a new long-range radar system.
National surface awareness rollout
The EWR installation is one of five SMR-4 systems deployed nationwide to date. The agency has accelerated its broader technological overhaul over the past year, replacing 60% of all copper wires in its national network and converting 363 radio sites. The FAA also transitioned 19 air traffic control towers to electronic flight strips and installed 151 IP voice switches at control towers across the country.
Bedford emphasized the operational volume driving the upgrades. “Newark sees well-over a thousand flights per day, and the new Surface Movement Radar will help controllers keep those flights safe at this major U.S. hub,” Bedford said, describing the deployment as a step toward modernizing the national airspace.
The push for enhanced surface surveillance follows a fatal runway incursion at LaGuardia Airport (LGA) on March 22, 2026. In that event, Air Canada (AC) Express Flight 8646, operated by Jazz Aviation using a Bombardier CRJ900, collided with an airport firefighting vehicle on Runway 4. The National Transportation Safety Board (NTSB) confirmed two pilot fatalities and 39 injuries. The NTSB is leading the ongoing Investigation, and no official cause has been determined.
In response to surface safety concerns, the FAA has installed 96 new Surface Awareness Initiative systems nationwide over the past year to provide controllers with better situational awareness.
AirPro News analysis
The FAA’s rapid deployment of 96 Surface Awareness Initiative systems and the ongoing SMR-4 rollout represent a tangible shift toward proactive technological intervention in ground operations. While the NTSB has not yet concluded its investigation into the March 2026 LaGuardia runway incursion, the agency’s aggressive timeline for replacing legacy copper wiring and installing surface tracking tools indicates that regulators are prioritizing immediate situational awareness upgrades for air traffic controllers. We view the $30 million targeted investment at EWR as a template the FAA is likely to replicate at other high-density hubs where legacy infrastructure limits operational capacity during low-visibility conditions.
Sources: Federal Aviation Administration
Photo Credit: Federal Aviation Administration
Regulations & Safety
FAA Revises Takeoff Obstacle Notes in Terminal Procedures
The FAA updates its Terminal Procedures Publication to simplify IFR departure planning with new DER crossing altitudes.

The Federal Aviation Administration (FAA) is revising the presentation of takeoff obstacle notes within its Terminal Procedures Publication (TPP), offering pilots a simplified method to utilize standard climb gradients during Instrument Flight Rules (IFR) departures.
In a press release issued on August 5, 2026, the National Business Aviation Association (NBAA) announced the charting updates. The revisions provide pilots with a specific Departure End of Runway (DER) crossing altitude, allowing them to safely clear low, close-in obstacles without calculating non-standard climb requirements for every individual threat.
Restructuring Obstacle Departure Procedures
Under the updated format, the FAA separates “Takeoff Minimums Obstacles” from “Low, Close-in Obstacles.” The agency defines low, close-in obstacles as those measuring 200 feet or less above the DER elevation.
Previously, pilots faced complex lists of individual obstacles during pre-flight planning. The new charting method consolidates these threats into distance groupings measured in quarter-mile increments from the DER. If a pilot meets the newly published DER crossing altitude, they can proceed using the standard IFR climb gradient of 200 feet per nautical mile (ft/NM) rather than a higher, non-standard gradient.
Industry advocacy and implementation timeline
The NBAA initially launched the effort to address the complexity of takeoff obstacle notes in 2015 during the FAA Aeronautical Charting Meeting. The resulting changes stem from collaboration between the FAA, the U.S. Instrument Flight Procedure Panel, and commercial charting providers including Jeppesen and Garmin.
While the FAA has officially adopted the new presentation standards, updating the entire National Airspace System will require a phased approach. The NBAA noted that the transition across all published procedures and commercial charts will take several years to complete.
AirPro News analysis
We view this charting revision as a practical step toward reducing pilot workload during IFR departure planning. By providing a clear DER crossing altitude that validates a standard 200 ft/NM climb, the FAA removes the ambiguity of evaluating multiple low, close-in obstacles individually. This change will be particularly beneficial for operators of aircraft with limited climb performance, allowing them to determine immediately if reported weather conditions permit visual obstacle avoidance when a higher climb gradient is unachievable.
Photo Credit: NBAA
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