MOSAIC Brings Big Changes to Aircraft Maintenance: What Owners, Mechanics, and Pilots Need to Know

1 week ago5 days ago14 mins

Photo by Tejasswat Rajindu on Pexels.com

The FAA’s Modernization of Special Airworthiness Certification (MOSAIC) rule is one of the most significant regulatory changes to affect aircraft maintenance in nearly two decades — and its second and final effective date arrives on July 24, 2026. Published July 24, 2025, MOSAIC was implemented in two phases: Phase 1 (October 22, 2025) restructured Light-Sport Repairman certification, expanded who can inspect Experimental Amateur-Built (EAB) aircraft, and allowed Part 43 minor repairs without manufacturer approval. Phase 2 (July 24, 2026) removes the “Light-Sport Aircraft” definition from 14 CFR § 1.1 and replaces it with the new “light-sport category aircraft” airworthiness certificate, opening the door to modern, more capable aircraft under industry consensus standards. Importantly, maintenance rules for aircraft with Standard Airworthiness Certificates did NOT change — a critical distinction many pilots have missed.

For anyone maintaining, inspecting, or owning aircraft in the light-sport, experimental, or expanded sport-pilot-eligible categories, MOSAIC represents a fundamentally new operating environment. Here’s the full picture of what’s changed, what’s coming, and what pilots and owners should actually do.

What MOSAIC Is (and Isn’t)

MOSAIC — the FAA’s Modernization of Special Airworthiness Certification rule — was published as a final rule in the Federal Register on July 24, 2025. It amends 14 CFR Parts 1, 21, 22 (new), 43, 61, 65, and 91 to modernize the entire framework governing light-sport aircraft (LSA) design, certification, operation, and maintenance.

The rule was built on a decade of collaboration between the FAA, EAA, AOPA, GAMA, Van’s Aircraft, Vertical Aviation International (VAI), Hartzell Propeller, and other industry stakeholders. It replaces the arbitrary 1,320-pound weight limit that defined LSA since 2004 with performance-based standards — most notably, a maximum clean stall speed (VS1) of 59 knots calibrated airspeed.

MOSAIC includes two effective dates:

October 22, 2025 (Phase 1): Sport pilot certification changes, Light-Sport Repairman (LSR) rule updates, LSA maintenance changes, tow-hitch installation privileges, Class G airspace and right-of-way changes
July 24, 2026 (Phase 2): Removal of the LSA definition from 14 CFR § 1.1, new airworthiness certification requirements under Part 22, operating limitations for the new light-sport category aircraft

The maintenance-related changes are the heart of what makes MOSAIC transformative for owners, mechanics, and homebuilders. Here’s what actually changed.

What Did NOT Change: Standard Airworthiness Certificate Maintenance

Before diving into what’s new, it’s essential to state clearly what’s unchanged. Maintenance standards for aircraft with standard airworthiness certificates did not change under MOSAIC. This is the most-misunderstood part of the rule.

A Cessna 172, Piper Cherokee, Cessna 152, or similar standard-category aircraft that is now sport-pilot-eligible (because its stall speed is 59 knots CAS or less) does not become an LSA. It remains a type-certificated aircraft with a standard airworthiness certificate. That means:

Annual inspections must still be performed by an A&P mechanic with an Inspection Authorization (IA) — not a Light-Sport Repairman
Part 43 maintenance rules continue to apply in full
Part 91 inspection requirements remain unchanged
All applicable Airworthiness Directives (ADs) must still be complied with

The Pilot Institute, Global Aerospace, AOPA, and other authoritative sources have all emphasized this point. Being sport-pilot-eligible does not migrate an aircraft into the LSA maintenance framework. The aircraft’s certification basis stays the same.

For owners of standard-category aircraft, MOSAIC does not change your maintenance obligations. If you own a Cessna 172, your annual inspection still costs what it always did and still requires an A&P/IA.

Change 1: Light-Sport Repairman Certificate Restructured

The Light-Sport Repairman (LSR) certificate has been meaningfully restructured under MOSAIC. There is still only one repairman certificate (light-sport), but it can now be issued with two different ratings — inspection and/or maintenance — and each has its own eligibility, privileges, and limitations.

LSR with Inspection Rating. The 16-hour Repairman (Light-Sport, Inspection) course now qualifies an owner to perform condition inspections on aircraft they own — including their own EAB aircraft in the category (airplane, rotorcraft, etc.) matching their training. This is a substantial expansion for non-builder EAB owners who previously had no path to perform their own condition inspections.

LSR with Maintenance Rating. The longer LSR-Maintenance course (typically 80 to 120 hours depending on category) allows the repairman to perform maintenance and condition inspections on any light-sport category aircraft in their trained category and class — not just aircraft they own. Maintenance Rating holders may also charge for their services, unlike Inspection Rating holders.

The Repairman changes took effect October 22, 2025, though the FAA is still building out the ecosystem of approved training courses and reference materials.

Change 2: EAB Condition Inspections — A Major Expansion for Non-Builders

Perhaps the single most consequential MOSAIC maintenance change is the expansion of who can perform annual condition inspections on Experimental Amateur-Built (EAB) aircraft.

Before MOSAIC. Only three categories of people could perform an EAB condition inspection:

The original builder of the aircraft (if they hold the specific repairman certificate for that airframe)
An A&P mechanic (no IA required)
Any certified Light-Sport Repairman with Maintenance Rating (LSRM)

If you bought a used EAB from someone else, and you weren’t an A&P or LSRM, you had to hire an A&P every year for your condition inspection.

After MOSAIC. Any EAB owner can now take a 16-hour LSR-Inspection course and, once certificated, legally perform the annual condition inspection on their own amateur-built aircraft — provided the aircraft is in the same category (e.g., airplane) as their training. If they complete the longer LSR-Maintenance course, they can perform inspections on any EAB of the same category, not just their own.

For the estimated 30,000+ registered EAB aircraft in the U.S. and their owners, this change dramatically reduces the annual maintenance burden. Van’s Aircraft — the world’s largest kit aircraft manufacturer — has called out the maintenance privileges expansion as one of the most significant changes for RV owners.

One important caveat. EAB aircraft with operating limitations issued before October 22, 2025, must obtain revised operating limitations that specifically permit a Light-Sport Repairman to perform the annual condition inspection. Owners can request an amended airworthiness certificate through their local Flight Standards District Office (FSDO) to update operating limitations to align with the current version of FAA Order 8130.2, Appendix D, Table D-1.

The FAA published SAIB 2026-06 on March 12, 2026, encouraging EAB owners to obtain revised operating limitations. Absent revised operating limitations, some older EAB aircraft’s operating limitations may not permit LSR-performed condition inspections regardless of the new rule.

Change 3: Part 43 Minor Repairs Without Manufacturer Approval

MOSAIC also reduces owner burden by allowing minor repairs and minor alterations to be performed in accordance with Part 43 maintenance standards without requiring manufacturer approval.

This is a meaningful change because previous LSA rules often required manufacturer sign-off or explicit consensus-standard authorization for even minor repair work. Under MOSAIC:

Minor repairs on light-sport category aircraft can be performed following standard Part 43 practices
Minor alterations can be made without going back to the manufacturer for approval
The definitions of “major” and “minor” continue to follow existing Part 43 Appendix A

For LSA owners whose aircraft manufacturers are no longer in business or slow to respond — a real problem across the LSA fleet where several early-era manufacturers have folded — this change restores maintenance flexibility that was previously blocked by manufacturer-approval requirements.

Important note: Major repairs and major alterations still require the involvement of one of the following:

An FAA design approval holder (DAH) for the affected product or part
A person authorized by the manufacturer
A person meeting an industry-developed, FAA-accepted, third-party modifier consensus standard

Change 4: Voluntary Compliance with Manufacturer Safety Directives

Another Phase 1 MOSAIC change: aircraft owners and operators may now voluntarily comply with manufacturer-issued safety directives and service information — rather than being required to comply as before.

This aligns LSA safety directive practice more closely with the standard-category world, where manufacturer service bulletins are generally advisory unless elevated to FAA Airworthiness Directive status. Airworthiness Directives (ADs) issued by the FAA remain mandatory. What has changed is the treatment of manufacturer-issued safety directives that have not been elevated to AD status.

Practical implication: LSA owners now have more discretion about which manufacturer safety directives to implement, based on their own assessment of the safety issue and its applicability to their operation. This is welcome flexibility for owners of orphan LSA whose manufacturers may have issued directives that no longer make operational sense.

Standard remains: Under 14 CFR § 91.7, no person may operate a civil aircraft unless it is in airworthy condition. Where a safety-of-flight condition exists, it must still be corrected before the aircraft can be legally operated regardless of MOSAIC’s voluntary-compliance provision.

Change 5: New Aircraft Categories Coming July 24, 2026

Phase 2 of MOSAIC — effective July 24, 2026 — creates the regulatory framework for a new generation of light-sport category aircraft with dramatically expanded capabilities:

New propulsion types allowed: Turbine engines, electric motors, and hybrid systems
New aircraft types allowed: Gyroplanes, rotorcraft (including helicopters), powered-lift (eVTOL-like)
Expanded seating: Up to 4 seats for airplanes (though sport pilots remain limited to 1 passenger)
Higher performance: Constant-speed propellers, retractable landing gear, simplified flight controls
Higher stall speed: 59 knots CAS (up from 45 knots)
Higher max level flight speed (VH): 250 knots

Manufacturers can begin certifying new aircraft under the expanded category on July 24, 2026. These aircraft will be issued light-sport category airworthiness certificates rather than the older LSA certificates.

For maintenance implications, this means the LSR-Maintenance ecosystem will need to expand to cover new aircraft types (rotorcraft, powered-lift) and new propulsion systems (turbine, electric). The FAA is still building out the training courses, consensus standards, and reference materials to support this expansion. Expect substantial activity around EAA AirVenture Oshkosh 2026 (July 20-26) as MOSAIC Phase 2 formally begins.

Change 6: CFIs No Longer Need a Medical for LSA Instruction

While primarily an operational rather than maintenance change, this MOSAIC provision matters for the entire flight training ecosystem. CFIs providing instruction in light-sport aircraft no longer need to hold an FAA medical certificate to instruct (and act as PIC) in an LSA — provided they comply with sport pilot restrictions (below 10,000 feet, daytime, etc.) if they lack a medical.

For flight schools running LSA-based training programs, this expands the pool of available instructors and reduces overhead. It also creates a pathway for retired airline pilots and other experienced aviators who may not maintain a medical certificate to remain active as instructors.

What Maintenance Providers Should Do

For A&P mechanics, IAs, and Light-Sport Repairmen, MOSAIC creates both opportunity and complexity:

A&Ps and IAs. Your certification and privileges are unchanged. However, you’ll increasingly work in an environment where owners have more legal maintenance authority than before — particularly around minor repairs, minor alterations, and manufacturer safety directive compliance. Be prepared to work collaboratively with owner-performed maintenance and to document interfaces clearly.

Light-Sport Repairmen. Enroll in FAA-recognized training courses to secure your Inspection or Maintenance rating on the light-sport category aircraft you plan to work on. The current list of approved LSA Repairman inspection and maintenance courses is available at faa.gov/aircraft/gen_av/light_sport/LSA_repairmen_courses, though this list is expected to grow substantially as Phase 2 takes effect.

New maintenance providers. The MOSAIC framework will support new aircraft types (rotorcraft, powered-lift, electric propulsion) as Phase 2 comes online. Maintenance providers with early expertise in these categories will be well positioned as the aircraft enter service over the next several years.

What Aircraft Owners Should Do

For pilots and owners, three practical action items depending on your aircraft:

If you own a Standard-Category aircraft (Cessna 172, Piper Cherokee, etc.): No maintenance changes apply to you under MOSAIC. Continue routine annual inspections through your A&P/IA. The main MOSAIC benefit for you is that you may now be able to fly your aircraft under sport pilot privileges if the stall speed is 59 knots CAS or less — using a driver’s license medical for daytime VFR operations.

If you own a Light-Sport Aircraft (SLSA/ELSA): Understand the expanded LSR privileges, the ability to perform minor repairs without manufacturer approval, and the voluntary compliance provisions for manufacturer safety directives. Consider whether pursuing an LSR-Inspection or LSR-Maintenance rating for your aircraft category makes sense for your operation.

If you own an Experimental Amateur-Built (EAB) aircraft: Consider taking the 16-hour LSR-Inspection course to gain the ability to perform your own annual condition inspections. Verify whether your operating limitations already permit LSR-performed condition inspections or whether you need to obtain amended operating limitations through your FSDO. Reference FAA Order 8130.2, Appendix D, Table D-1 for current-standard limitations language.

How This Connects to the Broader Modernization Agenda

MOSAIC is one of several major FAA regulatory modernization efforts in 2025-2026:

FAA Part 25 Certification Modernization NPRM (June 26, 2026) — updating transport airplane certification standards, harmonizing with EASA
Removal of Obsolete Twentieth-Century Airman Certificates NPRM (June 26, 2026) — cleaning up dead language in Part 61
BasicMed OMB renewal (June 25, 2026) — preserving the alternative pilot medical pathway
AME Guide updates — mental health counseling (May 2026) and cardiac disposition tables (June 2026)
FAA Reauthorization Act of 2024 (Public Law 118-63) — the underlying congressional direction for much of the modernization work
Executive Order 14192 and 14219 — the broader deregulatory framework driving several parallel efforts

Taken together, these actions reflect a coordinated FAA modernization posture — updating decades-old rules to reflect current technology, industry structure, and operational reality without compromising safety standards.

The Bottom Line

MOSAIC is transformative for maintenance in the light-sport, experimental, and expanded-sport-pilot-eligible categories. Non-builder EAB owners can now perform their own condition inspections through the 16-hour LSR-Inspection course. LSA owners have expanded rights to perform minor repairs and alterations without manufacturer approval. Voluntary compliance replaces mandatory compliance for manufacturer safety directives. And a new generation of light-sport category aircraft — including rotorcraft, powered-lift, and electric aircraft — begins certification on July 24, 2026.

For owners of standard-category aircraft, however, maintenance rules are unchanged. A Cessna 172 remains a type-certificated aircraft under Part 43 rules regardless of whether a sport pilot flies it. This is the single most important thing pilots must understand about MOSAIC.

For maintenance providers, MOSAIC creates opportunity in expanded LSR training, new aircraft categories, and new propulsion technologies. For owners, it creates flexibility, reduces annual costs, and opens pathways that didn’t exist before. And for the broader aviation community, MOSAIC is one of the clearest signals yet that FAA modernization can deliver real regulatory relief without compromising safety.

Between now and the July 24, 2026 Phase 2 effective date, expect substantial industry activity — much of it centered at EAA AirVenture Oshkosh 2026 — as manufacturers, training organizations, and maintenance providers finalize their responses to the new operating environment.

Frequently Asked Questions

What is MOSAIC? MOSAIC (Modernization of Special Airworthiness Certification) is an FAA rule published as a final rule in the Federal Register on July 24, 2025, that amends 14 CFR Parts 1, 21, 22 (new), 43, 61, 65, and 91. It modernizes the framework governing light-sport aircraft (LSA) design, certification, operation, and maintenance. Phase 1 took effect October 22, 2025, and Phase 2 takes effect July 24, 2026.

Does MOSAIC change maintenance for standard-category aircraft like the Cessna 172? No. Maintenance rules for aircraft with standard airworthiness certificates did not change under MOSAIC. A Cessna 172, Piper Cherokee, or similar type-certificated aircraft remains subject to Part 43 maintenance rules and Part 91 inspection requirements. Annual inspections must still be performed by an A&P mechanic with an Inspection Authorization (IA). Being sport-pilot-eligible does not migrate an aircraft into the LSA maintenance framework.

Can EAB owners now perform their own annual condition inspections? Yes, with training. Under MOSAIC, any EAB owner can complete a 16-hour Repairman (Light-Sport, Inspection) course and legally perform the annual condition inspection on their own amateur-built aircraft — provided the aircraft is in the same category (airplane, rotorcraft, etc.) as their training. EAB aircraft with operating limitations issued before October 22, 2025, may need to obtain revised operating limitations that specifically permit Light-Sport Repairman-performed condition inspections. FAA SAIB 2026-06 (March 12, 2026) encourages owners to update their operating limitations.

Do LSA owners still need manufacturer approval for minor repairs? No. Under MOSAIC, minor repairs and minor alterations to light-sport category aircraft may be performed in accordance with Part 43 maintenance standards without requiring manufacturer approval. Major repairs and major alterations still require involvement from an FAA design approval holder (DAH), a person authorized by the manufacturer, or a person meeting an industry-developed, FAA-accepted, third-party modifier consensus standard.

When does the second phase of MOSAIC take effect? July 24, 2026. Phase 2 removes the “Light-Sport Aircraft” definition from 14 CFR § 1.1 and replaces it with the new “light-sport category aircraft” airworthiness certificate. Under the expanded rules, new aircraft can be certified with turbine engines, electric motors, up to 4 seats (for airplanes), constant-speed propellers, retractable landing gear, and other advanced features previously prohibited for LSA. Expect substantial activity around EAA AirVenture Oshkosh 2026 (July 20-26) as Phase 2 formally begins.

Sources: