ATC Systems Failing: How Aging Infrastructure Forces Avionics Change

The Federal Aviation Administration has determined that 51 of its 138 air traffic control systems are unsustainable. More than 100 of those systems have been classified as inadequate. Some modernization projects will not reach completion for another 10 to 13 years. These are not projections — they are findings from the U.S. Government Accountability Office, published in a September 2024 report. For operators, dispatchers, and aviation planners worldwide, the implications are direct: aging ground infrastructure is no longer a background concern. It is actively reshaping equipage requirements, route planning, and airspace access.

FlySafe analysis shows that the intersection of deteriorating ATC infrastructure and accelerating traffic demand creates measurable operational risk that every stakeholder in aviation must now address.

The Scale of Infrastructure Degradation

The numbers are stark. According to the GAO, the FAA operates systems that are at least 30 years old with no modernization plans in place. Nearly 800 voice switches across en route, terminal, and air traffic control tower facilities rely on outdated analog technology, as documented in the FAA's Brand New Air Traffic Control System Plan. These switches lack flexibility for dynamic re-sectorization or integration with Voice over Internet Protocol (VoIP) technology. Spare parts are scarce. Skilled personnel capable of maintaining these systems are retiring.

FAA Administrator Bedford stated publicly that the facilities the FAA operates are "grossly archaic, obsolete and relatively unsustainable," and that the majority of the agency's $4 billion annual investment goes to sustaining legacy operations rather than building replacements. As reported by FedScoop, Bedford characterized the current spending posture as "putting lipstick on a pig."

The operational reality is that controllers in many facilities are working with decades-old COBOL code, as noted by Leeham News. Upgrading requires navigating a procedural process that frequently outlasts the technology being replaced. If a system takes 10 years to build, it is 10 years out of date by the time it becomes operational.

What This Means for Airspace Operations

Airspace status: The degradation of ground-based ATC infrastructure has direct consequences for how aircraft operate within the National Airspace System (NAS). When tower communication systems fail or perform below specification, separation assurance depends more heavily on airborne systems. When radar coverage degrades, aircraft equipped with Automatic Dependent Surveillance-Broadcast (ADS-B) Out become the primary surveillance source rather than a supplementary one.

According to the Alliance for Aviation Across America, more than 87,000 flights cross U.S. airspace every day. Civil aviation contributes $1.3 trillion annually to the U.S. economy and generates more than 10 million jobs. A study cited by the same organization found that failure to improve the current system would cost the U.S. economy $40 billion per year by 2033.

The safety margins that operators have relied upon — consistent radar coverage, reliable voice communication, predictable controller workload — are eroding. This erosion does not manifest as a single catastrophic event but as a gradual accumulation of operational limitations: sectors that cannot be dynamically resized to manage flow, communication frequencies that become congested because analog systems cannot support modern traffic density, and surveillance gaps that require increased procedural separation.

The Avionics Response: Equipage as Mitigation

When ground infrastructure cannot guarantee baseline service levels, the operational burden shifts to the aircraft. This is the mechanism by which ATC dysfunction forces avionics modernization. Operators who previously relied on ground-based navigation aids, radar surveillance, and voice communication as their primary operational framework must now invest in airborne capabilities that provide redundancy or independence from degraded ground systems.

The key technology transitions include:

ADS-B and satellite-based surveillance. The FAA's NextGen program established ADS-B as the successor to radar-based surveillance. According to the FAA's NextGen page, much of the NextGen architecture is now functioning, including satellite-based air traffic surveillance, aircraft navigation with GPS, and digital communications between pilots and controllers. Greater precision in tracking aircraft makes it possible to safely reduce separation in some situations, enabling more traffic without delays.

Data Communications (Data Comm). By 2016, Data Comm tower service deployment was completed at all 55 planned airports. En route services began implementation in 2019. Data Comm reduces reliance on congested voice frequencies — a critical capability when analog voice switches are failing.

Terminal Flight Data Manager (TFDM). According to GAO report GAO-24-105254, implementation of electronic flight strips as part of TFDM is anticipated for completion at 89 airports by fiscal year 2028. TFDM represents the digital backbone for tower operations that currently depend on paper strips and aging display systems.

Common Automation Platform. The FAA must develop a common automation platform to replace both STARS (Standard Terminal Automation Replacement System) and ERAM (En Route Automation Modernization). As documented in the DOT system plan, these current systems are siloed, inflexible, and increasingly costly to maintain, with each program independently managing its own hardware and IT tools — resulting in redundant efforts and operational inconsistency.

The Modernization Timeline and Its Implications

The FAA has announced intent to implement a brand-new air traffic control system by the end of 2028, replacing core infrastructure including radar, software, hardware, and telecommunications networks. The contract structure is described as innovative and first-of-its-kind, designed to hold the Prime Integrator accountable for missed deadlines and performance issues. The implementation plan consists of six workstreams.

The FAA has indicated it is seeking an additional $20 billion to complete the three-year ATC integrator project. Peraton was selected over Parsons based on experience placing the entire Department of Defense in a cyber-secured cloud environment.

However, historical precedent warrants caution. The NextGen program, created in response to the Vision 100 — Century of Aviation Reauthorization Act of 2003, has been characterized as a multi-billion-dollar, decades-long project by the Environmental and Energy Study Institute. The GAO identified recurring challenges including unanticipated system requirements, insufficient stakeholder involvement during certain phases of development, and unanticipated events such as government shutdowns.

Affected routes: Until the new system is operational, operators across all U.S. FIRs must plan for continued infrastructure variability. STARS has been deployed at more than 90 percent of TRACON facilities, but the remaining gaps — combined with aging en route systems — create uneven service levels that affect routing efficiency and separation standards.

International Context and Coordination

The FAA has collaborated with Brazil, China, and India and coordinated with the European Union, Japan, Singapore, and the International Civil Aviation Organization to develop and modernize standards. Research, development, and testing of NextGen technologies have been primarily carried out at FAA facilities in New Jersey, Florida, and Texas.

This international coordination matters because equipage standards are converging globally. Aircraft that operate in U.S. airspace increasingly need the same capabilities demanded by EUROCONTROL, CAAS, and other authorities. The avionics overhaul driven by U.S. ATC dysfunction is not isolated — it reflects a worldwide recognition that ground infrastructure limitations must be compensated by airborne capability.

Recommendation: Operators planning fleet equipage decisions should consider not merely current mandates but the trajectory of ground infrastructure degradation. Systems that are adequate today may become essential tomorrow as ATC service levels fluctuate during the multi-year modernization period.

The Ground-Side Gap: Surface Operations

A critical and often overlooked dimension of ATC infrastructure aging involves surface operations. According to the DTIC NextGen 2025 capabilities document, NextGen's net-centric system architecture will provide both ATC and airport operations staff with real-time status information about runways, taxiways, navigational aids, and lighting systems. Ground service equipment movements will be monitored via both cooperative (active transmitter) and non-cooperative (passive) surveillance in real time.

The GAO noted that a September 2020 milestone for ADS-B initial operating capabilities for surface surveillance systems remained under development when FAA issued the NextGen Implementation Plan. This gap means that runway incursion risk — already identified as a primary safety concern — continues to depend on visual observation and voice communication at many facilities.

Based on publicly available NOTAMs and operational data, the inconsistency between airports with modern surface surveillance and those without creates a patchwork of safety assurance levels that operators must account for in their risk assessments.

What Operators Should Do Now

The convergence of aging ATC infrastructure and accelerating modernization creates a specific set of operational considerations:

1. Verify equipage alignment. Ensure fleet ADS-B Out compliance is complete and that Data Comm capabilities are being incorporated into avionics upgrade cycles.

2. Monitor NOTAM activity for facility degradation. Temporary service reductions at specific facilities may increase as aging systems experience more frequent failures during the transition period.

3. Plan for variable separation standards. Routes through airspace served by degraded automation may require increased separation, affecting fuel planning and schedule reliability.

4. Engage with the modernization timeline. The six-workstream implementation plan will affect different airspace sectors at different times. Operators should track which facilities are transitioning and when.

5. Invest in crew training. As the balance between ground-based and airborne responsibility shifts, flight crew must be prepared for increased reliance on onboard systems and reduced availability of traditional ATC services during transition periods.

Key Takeaway

The FAA's determination that over half its ATC systems are unsustainable is not merely a budget issue — it is an operational safety factor that directly affects every aircraft operating in U.S. airspace. The avionics overhaul now underway across the industry is not discretionary modernization; it is a necessary response to ground infrastructure that can no longer guarantee the service levels upon which current operations depend.

FlySafe continues to monitor infrastructure status indicators, NOTAM patterns, and modernization milestones to provide operators with actionable intelligence on airspace risk. The transition period between legacy and modern ATC systems represents a distinct operational environment that requires informed planning and continuous awareness.

Analysis based on publicly available data only.

Frequently Asked Questions

How does outdated mid-20th-century ATC infrastructure prevent the full effectiveness of modern avionics capabilities?

Modern avionics systems such as ADS-B In, Data Comm, and advanced FMS are designed to exchange data with ground automation. When ground systems run on decades-old COBOL code and analog voice switches, they cannot process or relay the digital information that modern aircraft generate. The aircraft capability exists, but the ground-side link remains the bottleneck.

Why has the FAA taken a reactive rather than proactive approach to mandating equipage standards when safety experts have warned about these gaps for years?

The GAO has documented recurring challenges including unanticipated system requirements, insufficient stakeholder involvement, and government shutdowns that disrupt modernization timelines. Historically, each decade-long development cycle produces technology that is already outdated upon deployment, creating a persistent lag between identified need and operational implementation.

If modern aircraft have collision-avoidance systems, why is visual "see and avoid" still a primary safety mechanism in controlled airspace?

Surface surveillance automation — which would provide comprehensive ground-based tracking — remains incomplete at many facilities. The ADS-B surface surveillance milestone from 2020 was still under development when the FAA issued its NextGen Implementation Plan. Until ground automation catches up, procedural and visual methods remain necessary supplements to airborne systems.