Regulations & Safety
FAA Highlights Aircraft Fuel Contamination Risks and New Detection Tech
FAA Advisory Circular 20-105C addresses aircraft fuel contamination risks. Coulson Aviation’s SafeFuel system automates real-time detection during refueling.

Aircraft fuel contamination remains a critical safety hazard in the aviation industry, capable of causing severe engine performance issues, component wear, and complete in-flight failures. According to recent reporting by the National Business Aviation Association (NBAA), mitigating these risks requires strict adherence to maintenance best practices and an understanding of the latest technological advancements.
The Federal Aviation Administration (FAA) has increasingly focused on this vulnerability. In late 2023, the agency issued Advisory Circular (AC) 20-105C, which explicitly identified fuel contamination, improper fueling, and maintenance oversights as primary root causes of reciprocating engine power-loss incidents.
As operators and fixed-base operators (FBOs) grapple with these challenges, industry experts are highlighting both traditional manual checks and emerging automated systems designed to catch contaminated fuel before it ever reaches an aircraft’s tanks.
The Persistent Threat of Fuel Contamination
Understanding the Contaminants
Aviation fuel is exposed to numerous contamination risks as it moves from refineries through storage and transfer systems. The NBAA reporting and industry filtration specialists outline four primary categories of contamination, water ingress, microbial growth, particulate matter, and chemical contaminants.
Water is often considered the most persistent threat, entering tanks through condensation, rain, or humid transfer conditions. It can form ice crystals at high altitudes that block fuel flow, or foster microbial growth on the ground. This microbial sludge can clog filters, cause fuel gauge malfunctions, and induce microbiologically influenced corrosion (MIC), severely damaging fuel tank structures.
Chemical contaminants also pose severe risks. The industry has seen incidents where Diesel Exhaust Fluid (DEF) was mistakenly added instead of Fuel System Icing Inhibitor (FSII) because both are clear liquids. DEF crystallizes in the aircraft’s fuel supply, leading to clogged filters and uncommanded engine shutdowns. Additionally, Super Absorbent Polymers (SAP) from aging filter separators can migrate into the fuel system, causing further obstructions.
Expert Guidance and Maintenance Best Practices
The Human Element in Fuel Safety
Preventing these hazards relies heavily on rigorous maintenance protocols and supply chain vigilance. Ed English, Vice President and Technical Director at Fuel Quality Services and an NBAA member, emphasized in the reporting that recent aviation incidents often stem from off-spec fuel caused by water, microbes, DEF cross-contamination, and SAP migration.
Traditional mitigation strategies depend on aviation maintenance technicians (AMTs) and flight crews strictly following preflight checklists. Best practices mandate sumping fuel tanks before flight to drain accumulated water or debris and taking regular fuel samples.
“Experts share their guidance on the latest best practices to guard against aircraft fuel contamination,” according to the NBAA Business Aviation Insider.
Deviations from these manual checks significantly increase the likelihood of contaminated fuel reaching the engine. Whether operators use their own fuel farms or rely on FBOs, experts strongly recommend rigorous check-and-balance procedures, ensuring dispensing equipment is clean and personnel are adequately trained.
Technological Breakthroughs in Fuel Quality Assurance
Automating Contamination Detection
While manual checks are essential, verifying fuel quality at the exact point of entry has historically been a vulnerability for the industry. To address this safety gap, Coulson Aviation recently introduced “SafeFuel,” described as the aviation industry’s first patented onboard automated fuel quality assurance system.
Britton “Britt” Coulson, President and COO of Coulson Aviation, explained that the SafeFuel system integrates directly into an aircraft’s single-point refueling manifold. It utilizes multiple sensors to continuously monitor and analyze fuel for water, particulates, and chemical anomalies in real time during the refueling process.
If the system detects degradation or contamination, it automatically halts the fueling operation and alerts the crew immediately. This automated prevention stops contamination at its inception, preventing a ripple effect of mechanical failures, expensive inspections, and grounded aircraft. Furthermore, it digitally records fuel quality data over time, allowing operators to identify patterns in fuel exposure.
AirPro News analysis
We observe that the aviation industry is at a transitional point regarding fuel safety. The reliance on manual sumping and visual sampling, while foundational, leaves a margin for human error that modern aviation operations can ill afford. The introduction of automated, inline detection systems like SafeFuel represents a necessary evolution in risk management.
Furthermore, the FAA’s explicit focus on fuel contamination in AC 20-105C signals that regulatory scrutiny will likely increase. Operators who proactively adopt digital fuel quality tracking and automated shut-off systems will not only enhance safety but also protect themselves from the steep financial liabilities associated with fuel system overhauls and engine replacements.
Frequently Asked Questions (FAQ)
- What is the most common cause of aircraft fuel contamination?
Water ingress is considered the most persistent issue, as it can lead to ice formation at altitude and foster microbial growth in fuel tanks on the ground. - What did FAA Advisory Circular 20-105C address?
Issued in late 2023, it analyzed root causes of reciprocating engine power-loss accidents, highlighting fuel contamination and maintenance oversights as major contributing factors. - How does the SafeFuel system work?
Developed by Coulson Aviation, it is an onboard system that monitors fuel in real time during refueling, automatically halting the process if water, particulates, or chemical anomalies are detected.
Sources
Photo Credit: Envato
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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