Regulations & Safety
FAA Finalizes MOSAIC Rule Overhaul for Light Sport Aircraft
FAA updates Light Sport Aircraft rules with MOSAIC, enabling performance-based certification and expanded pilot privileges.
FAA Finalizes Major Overhaul of Light Sport Aircraft Rules: The MOSAIC Rule
The Federal Aviation Administration (FAA) has officially finalized the Modernization of Special Airworthiness Certification (MOSAIC) rule, marking the most significant regulatory shift in light sport aircraft (LSA) since their introduction in 2004. Announced at the EAA AirVenture Oshkosh event in July 2025, this sweeping reform redefines how LSAs are certified and operated in the United States.
By removing outdated weight limits and introducing performance-based criteria, the FAA aims to modernize aviation safety standards, encourage innovation, and expand access to recreational and training aviation. The rule is the culmination of over a decade of collaborative work between the FAA, industry stakeholders, and aviation advocacy groups such as the Experimental Aircraft Association (EAA) and Aircraft Owners and Pilots Association (AOPA).
MOSAIC reflects a shift toward more flexible and safety-oriented regulation, aligning U.S. aviation policy with international trends and enabling broader use of modern technologies such as electric-aviation propulsion and advanced avionics.
Historical Context of LSA Regulations
The Light Sport Aircraft category was introduced by the FAA in 2004 under the Sport Pilot rule. This initiative aimed to reduce the cost and complexity of becoming a pilot while promoting safer and more accessible recreational flying. The original rules limited aircraft to a maximum takeoff weight of 1,320 pounds (1,430 pounds for seaplanes), a maximum stall speed of 45 knots, and a top speed of 120 knots.
Sport pilots were allowed to fly with a valid U.S. driver’s license in lieu of a medical certificate, but they faced restrictions such as daylight-only operations, prohibition from flying in controlled airspace without training, and the inability to carry more than one passenger. These constraints, while initially effective in reducing entry barriers, became increasingly misaligned with evolving technology and pilot needs.
In response to these limitations, the FAA launched the MOSAIC initiative in 2013. The goal was to modernize the certification framework to accommodate safer, more capable aircraft while retaining the accessibility that defined the LSA category. Over the next decade, the FAA worked with industry experts, pilot communities, and manufacturers to develop a rule that balanced innovation with safety.
Key Provisions of the MOSAIC Final Rule
Aircraft Certification Changes
The most notable change under MOSAIC is the elimination of the fixed weight limit for LSAs. Instead, certification now depends on performance metrics, particularly stall speed. Aircraft with stall speeds below 54 knots (VS1) can qualify as LSAs, even if they weigh up to 3,000 pounds. This shift allows for better crashworthiness and structural integrity without compromising safety.
In addition, the new rule permits configurations previously excluded from the LSA category. These include retractable landing gear, constant-speed propellers, and alternative propulsion systems such as electric and hybrid engines. Aircraft can now have up to four seats, although sport pilots are still limited to carrying one passenger.
Manufacturers are also given the option to comply with voluntary noise standards, aligning with environmental goals and community concerns in populated areas. These provisions open the door for a new generation of light aircraft that are more versatile, efficient, and environmentally conscious.
“This landmark rule aims to increase the availability of safe, modern, and affordable aircraft for recreational aviation, flight training, and certain aerial work.”, FAA Administrator Bryan Bedford
Pilot Privileges Expansion
Sport pilots now have significantly expanded privileges under MOSAIC. With appropriate endorsements, they can operate helicopters, gyroplanes, and powered-lift aircraft. Night flying is also permitted following specific training, a major shift from the previous daylight-only restriction.
For the first time, sport pilots are allowed to conduct limited commercial operations such as aerial photography, agricultural surveillance, and infrastructure inspection. While the one-passenger limit remains, these changes greatly increase the utility and career potential for sport pilots.
The FAA retained the use of a valid U.S. driver’s license as a substitute for a medical certificate for sport pilots, maintaining the low-barrier entry point that has made the category popular among recreational aviators.
Implementation Timeline
Changes related to pilot privileges and maintenance certification will go into effect 90 days after the rule’s publication, expected in October 2025. Aircraft certification changes will be implemented 365 days post-publication, in July 2026.
This phased approach allows time for manufacturers, flight schools, and pilots to adjust to the new standards and prepare for compliance. It also gives the FAA a window to monitor early adoption and make any necessary clarifications.
The rule incorporates feedback from more than 1,300 public comments received during the 2023 proposal period, reflecting a broad consensus within the aviation community on the need for modernization.
Impact on Aircraft Design and Manufacturing
Innovation and Market Growth
Aircraft manufacturers have responded swiftly to the MOSAIC rule. At EAA AirVenture 2025, companies like Tecnam and Sling Aircraft showcased new models compliant with the updated standards. These aircraft feature advanced avionics, improved payload capacities, and options for electric propulsion.
For example, the Sling HW, a four-seat aircraft with a 1,000-pound useful load, is designed to meet both training and recreational needs. Prices for MOSAIC-compliant aircraft range from $125,000 to over $300,000, depending on configuration and features.
MOSAIC is also expected to reduce reliance on experimental amateur-built aircraft, which have historically higher accident rates. By encouraging factory-built options, the FAA aims to promote safer and more reliable aviation.
Economic Projections
The global market for light sport aircraft was valued at $1.21 billion in 2024 and is projected to reach $2.03 billion by 2033. This growth is driven by increased demand for training aircraft and recreational flying options, particularly in emerging markets.
Industry analysts predict that U.S. registrations of LSAs could double over the next decade, fueled by lower training costs and expanded aircraft capabilities. This could lead to job creation across manufacturing, maintenance, and flight training sectors.
Flight schools are particularly optimistic, anticipating a surge in enrollment due to the affordability and versatility of new MOSAIC-compliant aircraft.
Conclusion
The finalization of the MOSAIC rule represents a pivotal moment in the evolution of general aviation. By replacing outdated limitations with performance-based standards, the FAA is fostering an environment where safety, innovation, and accessibility can coexist. The rule empowers pilots, encourages manufacturing innovation, and aligns U.S. aviation policy with international best practices.
Looking ahead, stakeholders across the aviation ecosystem, from pilots and schools to manufacturers and regulators, will play a crucial role in implementing and refining the new standards. If successful, MOSAIC could serve as a model for future regulatory modernization in other segments of aviation.
FAQ
What is the MOSAIC rule?
MOSAIC stands for Modernization of Special Airworthiness Certification. It is a new FAA rule that updates the certification and operational standards for light sport aircraft.
When does the MOSAIC rule take effect?
Changes to pilot privileges take effect 90 days after publication (October 2025), and aircraft certification changes take effect 365 days after publication (July 2026).
Can sport pilots now fly four-seat aircraft?
Yes, under the new rule, sport pilots can fly four-seat aircraft that meet performance criteria, but they are still limited to carrying only one passenger.
Are electric aircraft included in the new rule?
Yes, the rule allows for alternative propulsion systems, including electric and hybrid engines.
Does the rule change medical certificate requirements?
No, sport pilots can still operate with a valid U.S. driver’s license instead of a medical certificate.
Sources
Photo Credit: AOPA
Regulations & Safety
FAA Orders 737 MAX Fuselage Inspections on 471 US Aircraft
FAA Airworthiness Directive 2026-15-11 mandates fuselage inspections on 471 Boeing 737 MAX aircraft by September 10, 2026.
This is a developing story. Information may change as official details are released.
This is original reporting and analysis by AirPro News.
The Federal Aviation Administration (FAA) has mandated structural inspections for 471 U.S.-registered Boeing 737 MAX aircraft to detect potential cracking around the forward galley door, a condition that could compromise the fuselage structural integrity if left unaddressed.
Published in the Federal Register on August 6, 2026, Airworthiness Directive (AD) 2026-15-11 requires operators of Boeing 737-8, 737-9, and 737-8200 aircraft to inspect the fuselage skin and bear strap at the forward upper corner of the forward galley door cutout. The directive takes effect on September 10, 2026.
Regulatory requirements and compliance costs
The FAA initiated the rulemaking process following reports of structural fatigue in older Boeing 737 Next Generation (737NG) models. A Boeing investigation into the 737-600, 737-700, 737-800, and 737-900 series determined that high operating stresses caused stress concentration at the corner of the door cutout, leading to cracks in the fuselage skin and bear strap.
While no identical cracks have been documented on the newer 737 MAX fleet, the FAA concluded that the shared design and manufacturing processes make the newer aircraft susceptible to the same fatigue conditions.
The regulatory agency stated the inspections are necessary to prevent the inability of the principal structural element to sustain limit loads. Failure of these components would adversely affect the structural integrity of the airplane.
Operators must perform an initial external general visual inspection. The FAA estimates this initial check will require one work-hour per aircraft at a cost of $85, bringing the total estimated compliance cost for the U.S. fleet to $40,035.
Inspection timeline and fleet applicability
Boeing previously issued Alert Requirements Bulletin 737-53A1408 RB on December 20, 2024, outlining the necessary inspection procedures for operators. The FAA subsequently published a Notice of Proposed Rulemaking on November 25, 2025, before finalizing the directive.
The mandate applies specifically to the Boeing 737-8, 737-9, and the high-density 737-8200 variants operating under U.S. registry. International regulators typically follow FAA airworthiness directives for U.S.-manufactured aircraft, which may expand the inspection requirements to the global 737 MAX fleet.
AirPro News analysis
We view this directive as a standard proactive regulatory measure rather than an immediate grounding threat. The transition of structural inspection requirements from the 737NG to the 737 MAX is an expected part of the aircraft lifecycle, given the shared fuselage architecture between the generations. The low estimated compliance cost of $85 per aircraft indicates that the initial visual inspections can be integrated into routine line maintenance without causing significant operational disruptions for airlines.
Sources: Federal Aviation Administration
Photo Credit: Boeing
Regulations & Safety
Merlin Achieves SOI 3 Approval for Autonomous Flight System
Merlin secures Stage of Involvement 3 approval from CAANZ and FAA for its AI-based Merlin Pilot flight control software.
Merlin has reached a critical regulatory threshold in its pursuit of certified autonomous flight, securing Stage of Involvement 3 (SOI 3) approval from the Civil Aviation Authority of New Zealand for its core flight control and communication systems.
Announced in a press release on August 6, 2026, the milestone confirms that the software underpinning the Merlin Pilot platform has been verified against regulatory standards. The approval advances the company’s Part 23 certification program and was coordinated with the U.S. Federal Aviation Administration.
Advancing the Merlin Pilot certification program
The SOI 3 certification specifically covers two primary components of the Merlin Pilot architecture: the Flight Control Computer (FCC) and the Automated Communication System (ACS). The ACS is designed to interpret spoken air traffic control instructions and convert them into actionable commands, such as heading, altitude, and airspeed adjustments, which are then executed by the FCC.
In addition to the SOI 3 milestone, Merlin concluded an issue paper with the Civil Aviation Authority of New Zealand (CAANZ) establishing the certification approach for the artificial intelligence and machine learning natural language processing capabilities used in the system.
Merlin Chief Technology Officer Tim Burns stated that the achievement establishes a foundation for certifying the company’s flight autonomy and artificial intelligence capabilities.
“This milestone underscores Merlin’s approach of building trusted autonomy in partnership with regulators. This is significant as we’re not building experimental AI, but rather aviation-grade autonomy that performs full phase autonomy from takeoff to touchdown,” Burns said.
Commercial targets and military integration
The regulatory progress aligns with Merlin’s stated timeline to introduce autonomous flight into commercial revenue service. The company operates a flight test and development center in Kerikeri, New Zealand, where it has conducted hundreds of autonomous test flights.
Merlin Founder and CEO Matt George previously outlined the company’s operational targets, noting that no traditionally crewed, fixed-wing aircraft has flown autonomously in commercial revenue service. George stated the goal is to achieve this milestone in New Zealand by 2027.
Alongside its civil aviation efforts, Merlin is developing autonomous capabilities for military applications. The company holds an Indefinite Delivery, Indefinite Quantity contract with the U.S. Special Operations Command (USSOCOM) with a ceiling value exceeding $100 million. This program focuses on integrating the Merlin Pilot into the Lockheed Martin C-130J Super Hercules, a project that completed its Preliminary Design Review in March 2026.
The company has also expanded its focus to larger commercial platforms. On July 23, 2026, Merlin signed an agreement with Israel Aerospace Industries to develop autonomy for Part 25 commercial cargo aircraft. This followed a July 17, 2026, demonstration at EAA AirVenture Oshkosh, where the company completed an autonomous landing using a Cessna 208B Grand Caravan.
AirPro News analysis
We view the completion of SOI 3 as a major de-risking event for Merlin’s certification program. In aviation software certification, Stage of Involvement 3 is the phase where regulatory authorities verify that the software code actually satisfies the design requirements and that the testing procedures are robust. Passing this stage indicates that Merlin’s engineering processes for novel artificial intelligence and machine learning applications are meeting the strict safety standards required by CAANZ and the FAA.
By pursuing concurrent development paths across Part 23 utility aircraft, Part 25 large cargo aircraft, and military transport platforms, Merlin is diversifying its integration risk. The successful conclusion of the issue paper regarding natural language processing is particularly notable, as certifying non-deterministic AI systems for critical flight operations remains one of the most significant regulatory hurdles in the advanced air mobility and autonomous aviation sectors.
Sources: Merlin, Inc.
Photo Credit: Merlin
Regulations & Safety
Congress Eyes FAA Certification Reform for AAM Aircraft
A June 2026 CRS report outlines eVTOL certification hurdles as Senate legislation targets FAA timeline requirements.
This is original reporting and analysis by AirPro News.
The United States Congress is evaluating whether to streamline Federal Aviation Administration (FAA) certification requirements for Advanced Air Mobility (AAM) aircraft to prevent regulatory gridlock, according to a Congressional Research Service (CRS) report published on June 12, 2026.
The CRS report outlines the complexities of certifying electric vertical takeoff and landing (eVTOL) aircraft, which are designed to transport small payloads and a few passengers over distances of 10 to 150 miles. Lawmakers are attempting to balance the need to foster aerospace innovation with the stringent safety oversight implemented following the Boeing 737 MAX crashes in 2018 and 2019.
Certification timelines and regulatory hurdles
Current FAA rules grant a five-year validity period for transport category aircraft type certification applications. Normal, utility, aerobatic, and commuter categories receive a three-year window.
The CRS notes that certifying a new aircraft type typically takes between five and nine years. This timeline frequently forces developers to seek extensions to their initial applications to keep their certification programs active.
Noise limits for AAM applicants remain undefined by the FAA. The CRS report indicates that maximum noise levels and measurement conditions will differ from those established for commercial drones because of the larger size and weight of AAM vehicles. Separately, the FAA has not approved any AAM designs developed in China for use beyond experimental testing and limited flight demonstrations in the United States.
Legislative efforts to streamline approvals
Congressional scrutiny of commercial aircraft certification increased significantly after the Boeing 737 MAX accidents, culminating in the December 2020 passage of the Aircraft Certification, Safety, and Accountability Act. The CRS report notes that Congress might consider relaxing requirements that industry views as impediments, potentially through alternative means of compliance that offer “equivalent levels of safety to more traditional or established certification regulations.”
To address the specific needs of the nascent AAM industry, a bipartisan group of senators introduced the Aviation Innovation and Global Competitiveness Act (S. 3885) on February 12, 2026. The Senate Commerce Committee advanced the bill by voice vote on July 22, 2026.
If enacted, the legislation would require the FAA to publish a certification plan for AAM operations within 180 days. The agency would also be mandated to establish nonbinding expected time ranges for major certification milestones within 270 days. Concurrently, the FAA is operating the eVTOL Integration Pilot Program (eIPP) to evaluate emerging technologies in real-world environments.
AirPro News analysis
We view the tension between rapid innovation and rigorous safety oversight as the defining challenge for the AAM sector over the next decade. The CRS report highlights a fundamental mismatch between the statutory three-to-five-year certification windows and the reality of a five-to-nine-year development cycle for novel aerospace technologies.
Congress appears willing to explore alternative means of compliance for eVTOL manufacturers, provided those alternatives offer equivalent levels of safety to traditional standards. However, the political memory of the Boeing 737 MAX groundings ensures that any legislative mandate to accelerate FAA timelines will face strict scrutiny regarding passenger safety and system redundancy.
Sources: Congressional Research Service
Photo Credit: US Congress
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