Regulations & Safety
Hong Kong Boeing 747 Runway Excursion Preliminary Report Released
Preliminary report details Boeing 747 freighter runway excursion at Hong Kong Airport, highlighting system failure and ongoing international investigation.
Runway Excursion in Hong Kong: Unpacking the Preliminary Report on the Boeing 747 Freighter Accident
On October 20, 2025, a routine cargo flight concluded in tragedy at Hong Kong International Airport (HKIA). An ACT Airlines Boeing 747-481 BDSF freighter, operating for Emirates SkyCargo, veered off the runway during its landing roll, resulting in the complete loss of the aircraft and the deaths of two security personnel on the ground. The incident immediately prompted an investigation by Hong Kong’s Air Accident Investigation Authority (AAIA), which has now released its preliminary report. This initial document provides the first official, fact-based look into the sequence of events that led to the incident, offering critical data without yet drawing conclusions.
Preliminary reports are a standard and vital part of any major aviation accident investigation. Their purpose is to disseminate factual information to the public and the aviation industry in a timely manner, outlining what is known in the early stages. This transparency helps to manage speculation and provides immediate, verified details from sources like the Flight Data Recorder (FDR) and Cockpit Voice Recorder (CVR). For an industry built on safety and continuous improvement, these early findings are crucial. They lay the groundwork for a deeper analysis that will eventually identify the root causes and contributing factors, leading to safety recommendations aimed at preventing future occurrences.
The accident involves a Boeing 747, an aircraft with a long and storied history. While many passenger airlines have retired the “Queen of the Skies,” hundreds have been converted into freighters, forming the backbone of the global air cargo network. This incident brings renewed focus on the operational and maintenance considerations for these aging, yet indispensable, workhorses of the sky. The investigation’s findings will be closely watched by cargo operators worldwide who rely on similar fleets.
Deconstructing the Incident: Key Findings from the AAIA Report
The preliminary report, designated PLR-2025-04, meticulously lays out the timeline and established facts of the accident involving aircraft TC-ACF. The flight, operating as UAE9788 from Dubai, landed on Runway 07L at approximately 3:52 AM local time. The crew consisted of four members, with the co-pilot designated as the Pilot Flying for the landing. The plan was for a Flap 25 landing utilizing the Autobrake 2 setting. However, the landing roll quickly deviated from the norm.
The Landing Sequence and Loss of Control
According to the report, a critical event occurred shortly after touchdown. As the co-pilot applied reverse thrust to decelerate the aircraft, an “AUTOBRAKES” message appeared on the Engine Indication and Crew Alerting System (EICAS). This alert signaled a disarming of the automated braking system. In response, the captain, who was the Pilot Monitoring, took control of the aircraft. It was at this point that the situation escalated dramatically.
Data recovered from the FDR provides a stark picture of what happened next. The Number 4 engine, instead of providing reverse thrust to slow the aircraft, accelerated to approximately 107% N1 in the forward thrust direction. This asymmetric thrust caused the aircraft to veer sharply to the left, leading it to depart the paved runway surface. Examination of the flight deck after the accident found the Autobrake selector in the “Disarmed” position and the Number 4 engine thrust lever in the full forward position, corroborating the FDR data.
The aircraft’s journey after leaving the runway was destructive. It struck and destroyed various pieces of airport equipment, including meteorological sensors and signage, before crashing through a perimeter fence. The 747 then collided with a stationary security vehicle on a perimeter road, tragically killing the two occupants, before coming to rest in the sea. The impact forces were so severe that the aircraft’s entire tail section separated from the fuselage, and the plane was declared a total loss. All four crew members survived the accident.
The aircraft veered off to the left, resulting in a runway excursion… The aircraft subsequently collided with a stationary security ground vehicle… The impact resulted in the ground vehicle entering the sea. The two security staff in the ground vehicle perished.
Pre-Existing Conditions and Aircraft History
The investigation also looks into the aircraft’s condition before the flight. The report notes that the Boeing 747 was dispatched with two pre-existing issues documented on the Minimum Equipment List (MEL). One was a resolved cockpit indication for the Hydraulic System 1 Reservoir, and the other was an inoperative thrust reverser on the Number 4 engine. The inoperative reverser is a significant detail, as the FDR data later showed that same engine producing high forward thrust during the landing roll.
The aircraft itself, TC-ACF, had a long service history. Manufactured in 1993, it first flew for All Nippon Airways (ANA) as a passenger jet and was famously adorned with a “Pokémon Jet” livery. In 2011, it was converted into a freighter, a common second life for the durable 747 airframe. This history underscores the aircraft’s age and the extensive operational life typical of cargo planes in the modern era.
The Path Forward: A Multi-faceted Investigation
With the preliminary report published, the AAIA’s investigation now enters a more analytical phase. The successful recovery of the CVR and FDR is a critical milestone, as these “black boxes” provide invaluable data on the aircraft’s performance and the crew’s actions in the final moments of the flight. The investigation is being conducted in accordance with international standards set by the International Civil Aviation Organization (ICAO).
This international cooperation is essential for a thorough and impartial investigation. Accredited representatives from several key bodies are participating. These include the Transport Safety Investigation Center (TSIC) of Turkey, representing the state where the aircraft was registered and the airline is based, and the National Transportation Safety Board (NTSB) from the United States, representing the state of the aircraft’s design and manufacture. This collaborative approach ensures that all relevant expertise is brought to bear on the case.
The investigation will now focus on several key areas. Technical analysis will delve deeper into the aircraft’s braking and engine systems, particularly the failure of the autobrake system and the anomalous behavior of the Number 4 engine. Maintenance and engineering records will be scrutinized to understand the aircraft’s service history and the handling of the inoperative thrust reverser. Furthermore, the investigation will examine operational issues, including crew qualifications and experience, as well as human factors and the airline’s Safety Management Systems. The final report will synthesize all these elements to determine the cause and contributing factors, with the ultimate goal of issuing safety recommendations to prevent a similar tragedy.
Concluding Section
The preliminary report on the runway excursion of TC-ACF provides a factual, yet sobering, account of a catastrophic landing failure. It outlines a sequence of events where a disarmed autobrake system was followed by a critical surge of forward thrust from one engine, leading to a complete loss of directional control. While it refrains from assigning cause, the report lays a clear foundation for the next phase of the investigation, highlighting the complex interplay between mechanical systems and human action in the cockpit.
As the global air cargo industry continues to rely heavily on veteran aircraft like the Boeing 747, the findings from this investigation will be of paramount importance. The final report from the AAIA will not only provide closure on this specific incident but will also likely yield crucial safety lessons for operators, maintenance providers, and manufacturers. The goal, as always in aviation, is to learn from tragedy to build a safer future, ensuring the “Queen of the Skies” can continue her vital work without repeating such a devastating event.
FAQ
Question: What is a preliminary accident report?
Answer: A preliminary report is an initial document released by an air accident investigation authority. It provides established factual information from the early stages of an investigation, such as data from flight recorders, but does not include analysis, causes, or conclusions. Its purpose is to inform the public and aviation industry in a timely manner.
Question: What happens next in the investigation?
Answer: Investigators will now conduct a detailed analysis of the collected data, including the CVR and FDR. The investigation will focus on technical systems, maintenance records, operational procedures, and human factors. The AAIA will work with international partners like the NTSB to determine the root causes and contributing factors before publishing a final report with safety recommendations.
Question: Who is investigating the accident?
Answer: The Air Accident Investigation Authority (AAIA) of Hong Kong is leading the investigation. They are supported by accredited representatives from Turkey’s Transport Safety Investigation Center (TSIC) and the United States’ National Transportation Safety Board (NTSB).
Sources: AAIA Preliminary Report PLR-2025-04
Photo Credit: SCMP
Regulations & Safety
NTSB: Thermal Plugs Caused AA Flight 3023 Tire Failure
NTSB determines melted thermal relief plugs caused tire failure on American Airlines 737-8 at Denver, triggering emergency evacuation.
The National Transportation Safety Board (NTSB) has determined that melted thermal relief plugs caused the left main landing gear tires to fail on an American Airlines Boeing 737-8 during a July 2025 takeoff roll at Denver International Airport (DEN), prompting a high-speed rejected takeoff and emergency evacuation.
The final aviation investigation report, published on August 26, 2026, officially closes the inquiry into American Airlines Flight 3023. The document details the mechanical sequence that led to the tire failure while highlighting significant passenger noncompliance during the subsequent evacuation, as travelers ignored crew commands and retrieved carry-on baggage.
Mechanical sequence and rejected takeoff
The incident occurred on July 26, 2025, involving a Boeing 737-8, registration N306SW, equipped with CFM International LEAP-1B28 engines. According to the NTSB, the flight experienced an approximate 25-minute delay while awaiting departure at runway 34L.
During the subsequent takeoff roll, as the aircraft reached an indicated airspeed between 90 and 100 knots, the captain reported hearing a loud pop accompanied by a noticeable bump. The flight crew initiated a rejected takeoff at speeds above 80 knots.
The NTSB determined the probable cause of the incident was the melting of thermal relief plugs in the left main landing gear. This melting released tire pressure and caused the tires and wheels to fail during the takeoff roll. The agency noted that this failure resulted in abnormal airplane handling characteristics, which prompted the flight crew to reject the takeoff. Debris from the fractured wheels caused minor damage to the aircraft, including a three-inch dent on the lower skin of the left wing.
Emergency evacuation and passenger behavior
Following the rejected takeoff, the flight crew initially instructed the cabin to remain seated. Between 30 and 45 seconds later, after identifying smoke and fire originating from the left main landing gear, the crew ordered an emergency evacuation.
The aircraft carried 175 occupants, comprising 169 passengers and six crew members. The NTSB final report confirms that zero injuries occurred during the event. This official casualty figure supersedes preliminary media reports from July 2025 that had indicated minor injuries and hospital evaluations.
The investigation report draws specific attention to passenger behavior during the emergency egress. The NTSB stated that the cabin crew described the evacuation as rapid but hindered by significant passenger confusion and noncompliance. Despite flight attendants repeatedly commanding passengers to leave their belongings behind, multiple individuals retrieved their carry-on baggage. The NTSB concluded that this noncompliance directly slowed the flow of egress from the aircraft.
AirPro News analysis
The NTSB findings regarding American Airlines Flight 3023 add to a well-documented and growing safety concern within the commercial aviation sector. Passenger retrieval of carry-on baggage during emergency evacuations is a recurring issue that compromises the 90-second evacuation standard mandated by the Federal Aviation Administration (FAA).
When passengers stop to open overhead bins and carry luggage down escape slides, they not only slow the egress rate for those behind them but also introduce the risk of puncturing the evacuation slides or injuring fellow passengers. We continue to see official accident reports cite passenger noncompliance as a negative factor in evacuation efficiency. This recurring behavioral pattern has prompted safety advocates and lawmakers to question whether current FAA evacuation certification tests, which rely on compliant participants, accurately reflect real-world human behavior during an emergency.
Sources: National Transportation Safety Board
Photo Credit: National Transportation Safety Board
Regulations & Safety
Marine One Loss of Separation at DCA: NTSB Preliminary Report
NTSB cites radio line-of-sight failure after Marine One and Envoy Air E-170 came within 0.82 NM at Reagan National.
This is a developing story. Information may change as official details are released.
This is original reporting and analysis by AirPro News.
A loss of separation occurred on August 4, 2026, between a Sikorsky VH-3D operating as Marine One and an Envoy Air Embraer E-170 departing Ronald Reagan Washington National Airport (DCA). The incident took place approximately two miles north of the airport at 14:34 EDT and prompted an immediate Federal Aviation Administration (FAA) relocation of radio equipment after investigators identified a communication failure.
According to a preliminary report released on August 27, 2026, by the National Transportation Safety Board (NTSB), air traffic controllers at DCA did not receive a required three-minute pre-departure warning from the helicopter. The event triggered a review of strict Safety protocols implemented following a fatal midair collision in the same airspace in January 2025.
Incident timeline and separation data
The loss of separation occurred when Marine One departed The Ellipse simultaneously with Envoy Air flight 3742 departing runway 1 at DCA. Preliminary FAA estimates indicate the aircraft came within 0.82 nautical miles (NM) laterally and 700 feet vertically. The NTSB is currently analyzing surveillance data to establish the exact closest point of approach.
President Donald Trump was on board the Sikorsky VH-3D at the time of the incident. In a statement provided to CBS News, White House spokesman Kush Desai confirmed the President was never in danger.
Marine One flights are piloted by the finest aviators in the world, and the White House maintains the utmost confidence in these patriots and other security officials who are responsible for ensuring the President’s safety.
No injuries were reported among the occupants of either aircraft, and both flights continued to their respective destinations without further incident.
Communication failure and FAA response
The NTSB preliminary report points to inadequate radio line-of-sight coverage between The Ellipse and the DCA tower as the primary factor in the missed pre-departure warning. A DCA tower controller reported that the transmission attempt from the helicopter was “broken and unreadable,” according to CBS News.
Following the August 4 incident, FAA technicians evaluated the infrastructure and confirmed the line-of-sight deficiency. To resolve the issue, the agency relocated the helicopter-control radio equipment to the top of the DCA control tower. Subsequent communication checks were successful.
CBS News also reported that recent construction at the White House may have contributed to the radio line-of-sight degradation, though the NTSB has not yet issued a final determination on the cause.
Regulatory context and prior airspace changes
The airspace surrounding DCA operates under highly specific procedural rules designed to deconflict fixed-wing airline traffic from frequent VIP helicopter movements. These procedures were significantly tightened following a fatal midair collision on January 29, 2025, involving an airliner and an Army Black Hawk helicopter near the airport.
Following the 2025 accident, regulators instituted a requirement for a ground stop at DCA anytime a Helicopters passes on a conflicting route. The failure of the three-minute warning on August 4 prevented controllers from initiating this required ground stop for the Envoy Air departure.
Air traffic controllers and Marine One pilots had previously met on July 28, 2026, exactly one week prior to the incident, to discuss ongoing communication challenges in the sector.
AirPro News analysis
The August 4 loss of separation highlights the fragility of procedural deconfliction in the Washington, D.C. airspace. While the FAA characterized the event as a momentary loss of separation, the failure of a critical communication link reveals a single point of failure in the safety protocols established after the 2025 collision. We note that the rapid relocation of the radio equipment by the FAA demonstrates an acknowledgment of the infrastructure gap. As the NTSB continues its Investigation, we will monitor the docket for potential systemic recommendations regarding how VIP helicopter movements integrate with high-volume Commercial-Aircraft traffic at DCA, particularly concerning redundant communication systems.
Sources: National Transportation Safety Board
Photo Credit: National Transportation Safety Board
Regulations & Safety
FAA Moves to Fire Two LaGuardia Controllers After Fatal Collision
FAA initiates termination proceedings against two LaGuardia controllers for early shift departures on the night of the March 22, 2026 runway collision.
This is a developing story. Information may change as official details are released.
This article summarizes reporting by Reuters by David Shepardson and Doyinsola Oladipo.
The FAA has initiated termination proceedings against two air traffic controllers accused of leaving their shifts early on the night of a fatal runway collision at LaGuardia Airport (LGA) in March 2026. The agency is classifying the unauthorized early departures as timecard fraud amid a broader national crackdown on the practice.
The disciplinary action follows the March 22, 2026, accident in which Air Canada Express Flight 8646, operated by Jazz Aviation LP, collided with an aircraft rescue firefighting (ARFF) vehicle while landing on Runway 4. According to Reuters, the two controllers allegedly departed the facility approximately one hour before their scheduled shifts ended, a practice colloquially known as an “early shove.”
Disciplinary actions and union response
The FAA stated its commitment to holding employees accountable, emphasizing that it will not compromise the safety or efficiency of the national airspace system. U.S. Secretary of Transportation Sean Duffy condemned the practice, stating that while most controllers complete their full shifts, the department will not tolerate fraud from individuals who unfairly burden their colleagues and impact the airspace.
The National Air Traffic Controllers Association (NATCA) confirmed it is actively discussing the allegations with FAA leadership. The union indicated that these internal discussions are the appropriate forum for addressing the matter. Reuters reports that the FAA is currently conducting a nationwide enforcement effort targeting employees who leave on break at the end of their shifts and fail to return.
The March 22 collision and investigation
The NTSB continues to investigate the March 22 collision under investigation ID DCA26MA161. The official cause of the accident remains undetermined. The aircraft involved was an MHI RJ Aviation CRJ-900, and the ground equipment was an Oshkosh Striker 1500 ARFF vehicle.
Official NTSB figures confirm that 76 people were on board the aircraft, including 72 passengers, two flight attendants, and two pilots. The captain and first officer sustained fatal injuries. Thirty-nine individuals were transported to local hospitals, with six reported to have serious injuries.
It remains unverified whether the controllers’ early departure directly influenced the events leading to the collision. Speaking in March 2026, NTSB Chair Jennifer Homendy noted that operating with two controllers in the tower cab during a midnight shift is common practice across the national airspace system, suggesting the facility may have been operating at standard staffing levels at the time of the accident.
Regulatory response to surface safety
Following the LaGuardia accident, the FAA accelerated initiatives to improve surface visibility at airports. On May 13, 2026, the agency announced a $16.5 million investment to equip all airport vehicles with transponders.
These vehicle movement area transponders (VMATs) are designed to provide ATC with better situational awareness of ground equipment operating on runways and taxiways.
AirPro News analysis
We note that the FAA’s decision to pursue termination for timecard fraud rather than operational errors highlights a strict administrative approach to facility management. By focusing on the unauthorized absence, the agency addresses the “early shove” culture directly without preempting the NTSB’s ongoing safety investigation into the collision’s root causes. The distinction between administrative violations and operational fault will likely remain a focal point as NATCA engages with FAA leadership.
Photo Credit: Mike Segar – Reuters
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