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NTSB Findings on United Airlines 737 MAX March 2024 Runway Excursion

NTSB investigation details runway condition misperception in United Airlines 737 MAX runway excursion at Houston IAH in March 2024.

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This article is based on official investigative data and documents released by the National Transportation Safety Board (NTSB) regarding the March 2024 United Airlines Flight 2477 incident.

NTSB Docket Reveals Critical Disconnect in United Airlines 737 MAX Runway Excursion

The National Transportation Safety Board (NTSB) has opened the public docket for its ongoing investigation into the March 8, 2024, runway excursion involving United Airlines Flight 2477. The Boeing 737-8 MAX, registered as N27290, veered off the runway after landing at George Bush Intercontinental Airport (IAH) in Houston, Texas, resulting in the collapse of its left main landing gear.

Newly released documents highlight a significant discrepancy between the flight crew’s perception of the landing environment and the actual runway conditions. According to the investigative reports, the Captain believed the runway was dry and braking action was “Good,” while data indicates the surface was wet and slippery. This misperception appears to have influenced critical operational decisions, including the selection of a low autobrake setting.

While the investigation is ongoing and a final probable cause has not yet been determined, the factual reports provide a detailed look into the human factors and external pressures present in the cockpit during the incident.

Conflicting Assessments of Runway Conditions

The central finding in the newly released documents is the conflict regarding runway condition codes, which are essential for determining landing performance and braking requirements. The NTSB docket reveals that the Captain, who was the Pilot Flying, recalled seeing condition codes of 5/5/5 for Runway 27 on the Automatic Terminal Information Service (ATIS).

In aviation standards, a code of 5 corresponds to “Good” braking action, typically associated with a wet surface that is not slippery. However, investigators found that the actual ATIS broadcast at the time of the incident reported codes of 3/3/3. A code of 3 indicates “Medium” braking action, warning pilots that the runway is slippery when wet.

This disconnect extended to visual perception. The First Officer, serving as the Pilot Monitoring, correctly identified the runway as “wet.” In contrast, the Captain maintained the assessment that the runway appeared “dry,” a belief that directly impacted the braking strategy employed during the landing roll.

Braking Decisions and High-Speed Exit

Based on the perception of favorable conditions, the flight crew made decisions that reduced the aircraft’s deceleration rate. NTSB data indicates that the Captain selected “Autobrake 1,” the lowest available setting. United Airlines standard operating procedures generally recommend higher autobrake settings (such as MAX) when runway conditions are slippery or uncertain.

The docket further reveals that manual braking was not applied until the aircraft was approximately 6,000 feet down the runway. The crew attempted to exit the runway onto Taxiway SC, a high-speed exit, while traveling at approximately 39 knots. Investigators noted that this speed was excessive for the wet surface conditions present at the time.

As the aircraft attempted the right turn, the tires lost traction. The 737 MAX skidded off the paved surface into the grass, where the left main landing gear struck a concrete electrical junction box. The impact caused the gear to separate, and the aircraft came to rest on its left wing and engine nacelle. Fortunately, no injuries were reported among the 160 passengers and 6 crew members.

External Pressures and ATC Instructions

The investigation also sheds light on external factors that may have contributed to the crew’s decision-making. Transcripts included in the docket show that Houston Tower instructed the crew to “keep your speed up” during the approach to accommodate a tight arrival sequence.

Investigators suggested that this instruction might have created a “sense of urgency” in the cockpit to clear the runway quickly. The Captain reportedly requested to roll to the end of the runway to shorten the taxi time to the gate, a maneuver he stated he had performed “hundreds of times” in his career. The Captain is a veteran pilot with over 15,000 flight hours, including more than 9,600 hours on the Boeing 737, and had completed landing performance training just one month prior to the accident.

AirPro News Analysis

The release of these factual reports underscores a recurring theme in runway excursions: the danger of confirmation bias. When a pilot expects a “dry” runway based on prior experience or a misread report, they may subconsciously filter out contradictory visual cues, such as the “wet” appearance noted by the First Officer.

Furthermore, the “keep your speed up” instruction from Air Traffic Control highlights the subtle but powerful pressure placed on crews at high-volume hubs like Houston. While safety is always the priority, the operational drive to maximize runway throughput can inadvertently encourage crews to push the boundaries of stable deceleration, particularly when environmental conditions are worse than anticipated.

Next Steps in the Investigation

The opening of the public docket marks a significant phase in the NTSB’s process, allowing industry experts and the public to review the factual basis of the investigation. The docket includes operational factors reports, human performance studies, and transcripts from the Cockpit Voice Recorder (CVR).

The NTSB has not yet issued a final report. The board will continue to analyze the gathered data to determine the official probable cause of the accident and may issue safety recommendations to prevent similar occurrences in the future.

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Photo Credit: NTSB

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Regulations & Safety

FAA Opens $40M ATC Manufacturing Facility in Maryland

The FAA opened a $40M Rohde & Schwarz USA plant in Frederick, MD to produce VoIP switches for national ATC modernization by 2028.

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On August 25, 2026, the Federal Aviation Administration (FAA) and the U.S. Department of Transportation (USDOT) inaugurated a new $40 million manufacturing facility in Frederick, Maryland, dedicated to producing digital Voice over IP (VoIP) switches for the nation’s air traffic control network.

The 87,000-square-foot plant, operated by Rohde & Schwarz USA, represents a critical node in the FAA’s aggressive timeline to complete a nationwide air traffic control modernization overhaul by the end of 2028. According to an agency press release, the facility will build the CERTIUM Voice Communication System (VCS) to facilitate communication between air traffic controllers, pilots, and other control facilities.

Accelerating Air Traffic Control Modernization

The modernization effort is backed by a $12.5 billion down payment from the Working Families Tax Cut. U.S. Transportation Secretary Sean P. Duffy and FAA Administrator Bryan Bedford attended the opening to highlight the administration’s focus on domestic Manufacturing for critical aviation Infrastructure.

“Under President Trump, we aren’t just modernizing our skies at record speed—we’re putting American workers, American manufacturing, and American innovation first,” Duffy stated. “We’re making sure our air traffic control system is American made.”

Bedford emphasized the strict timeline driving the agency’s current procurement Strategy. He noted that the new facility supports the aggressive schedule to complete the new system by the end of 2028 while strengthening domestic production capabilities and creating high-quality jobs. Bedford described the equipment as a critical part of the landmark modernization effort.

Infrastructure Overhaul and Deployment Milestones

The opening of the Frederick plant follows a year of rapid infrastructure deployment by the FAA. The agency recently completed Wave 1 of its nationwide CERTIUM VCS deployment ahead of schedule. This milestone was marked by the installation of the 140th system at the Rapid City Regional Airport (RAP) control tower in South Dakota.

Beyond voice communication systems, the FAA has executed a massive infrastructure overhaul over the past year. The agency reports that 63 percent of legacy copper wires in air traffic control facilities nationwide have been replaced with high-speed fiber, 5G wireless, or Low Earth Orbit (LEO) capabilities.

Additional upgrades completed over the past year include the conversion of 388 radio sites and the installation of 176 IP voice switches. The FAA also deployed Surface Awareness Initiative technology at 96 towers, transitioned 21 towers to electronic flight strips, installed SMR4 Surface Movement Radars at five Airports, and added nine new Tower Simulation systems for controller Training.

AirPro News analysis

The opening of the Rohde & Schwarz USA facility in Maryland underscores a strategic shift toward localizing the supply chain for critical aviation infrastructure. By anchoring the production of digital VoIP switches domestically, the FAA mitigates supply chain risks that have historically delayed large-scale aerospace and infrastructure projects. We view the $12.5 billion funding injection as a substantial catalyst, though the 2028 completion target remains highly ambitious given the historical complexities of integrating new technologies into the national airspace system without disrupting active operations.

Sources: Federal Aviation Administration

Photo Credit: Federal Aviation Administration

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Regulations & Safety

Global Aerospace Issues Hangar Foam Suppression Safety Guidelines

Global Aerospace updates hangar fire suppression guidelines, citing 200+ accidental foam discharges and the shift to PFAS-free alternatives.

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Global Aerospace has issued updated safety and risk mitigation guidelines for aviation hangar fire suppression systems, highlighting the severe financial and environmental toll of accidental foam discharges. The aviation insurer published the comprehensive best practices on August 24, 2026, detailing the industry transition toward alternative fire protection technologies.

The guidance arrives alongside the introduction of the 2026 edition of National Fire Protection Association (NFPA) 409. This updated standard governs hangar fire protection and introduces critical changes to align requirements with modern aircraft design and growing environmental concerns regarding chemical suppressants.

The financial and human cost of accidental discharges

Fire suppression standards established in the mid-1970s heavily prioritized foam systems to combat large fuel-spill fires. However, Global Aerospace reports that these systems frequently cause more damage than the fires they are designed to prevent. Over the last two decades, more than 200 unnecessary foam discharges have occurred in aviation facilities.

These accidental activations have resulted in tens of millions of dollars in total damages, with the average per-incident cost reaching hundreds of thousands of dollars. Beyond property damage to aircraft and hangar infrastructure, accidental discharges pose severe life-safety risks to personnel.

The insurer cited a fatal 2014 incident at Eglin Air Force Base as a primary example of these hazards. Following a broken sprinkler pipe, the hangar filled with approximately 17 feet of foam in minutes, resulting in the death of one contractor.

Shifting standards and environmental-impact liabilities

Aviation insurers are increasingly processing claims that extend beyond immediate property damage to include long-term health risks and environmental restoration. This liability shift is largely driven by the presence of perfluoroalkyl substances (PFAS) in older aqueous film-forming foams (AFFF).

To mitigate these chemical risks, the aviation industry is actively transitioning toward fluorine-free foams and alternative fire suppression technologies. Global Aerospace highlighted the growing adoption of ignitable liquid drainage floor assemblies and optical flame detection systems, such as multi-spectrum infrared detectors. These alternatives eliminate hazardous chemicals and significantly reduce the likelihood of false alarms.

While the 2026 edition of NFPA 409 provides the framework for these modern systems, the updated standards must be adopted by local fire marshals before facilities can implement the changes.

Operational risk mitigation strategies

For facilities still operating legacy high-expansion foam (HEF) or AFFF systems, Global Aerospace recommends strict operational protocols to minimize the risk and impact of an accidental discharge. The insurer advises operators to protect all aircraft openings and secure sensitive electronics during maintenance operations.

In the event of a discharge, the guidelines stress the importance of keeping hangar doors closed to contain the foam and prevent environmental contamination outside the facility. Additionally, Global Aerospace recommends conducting all system testing and maintenance during off-hours to limit personnel exposure and operational disruption.

AirPro News analysis

The publication of these guidelines by a major aviation insurer underscores a broader industry reality: insurance providers are often the primary catalyst for operational safety upgrades. While regulatory bodies like the NFPA set the baseline standards, the financial pressure of uninsurable environmental liabilities tied to PFAS contamination is forcing hangar operators to modernize. We expect the transition to optical flame detection and drainage floor assemblies to accelerate rapidly as insurers begin pricing the risk of legacy foam systems out of the market.

Sources: Global Aerospace

Photo Credit: Global Aerospace

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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.

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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

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