TERRAIN SERIES
5G RESILIENT RADAR ALTIMETERS
Precision Altitude —
RF‑Dense Airspace Low‑Visibility Operations Critical Flight Phases When It Matters Most
Designed for the realities of today’s airspace
As RF environments become more complex, operators need radar altimetry that delivers predictable, trustworthy altitude data—not workarounds, assumptions, or added complexity.
Terrain Series radar altimeters are engineered to maintain stable AGL performance in the environments where accuracy matters most.
Confidence You Can Rely On— Flight After Flight
Terrain Series supports safety‑critical decision‑making during:
- Low‑level operations
- Approach and landing
- Hover and confined‑area flight
- Reduced‑visibility conditions
By delivering consistent altitude performance in modern RF environments, Terrain Series helps reduce uncertainty when margins are tight.
Built for Today’s Airspace—
Not Adapted After the Fact
Many radar altimeters were designed for a different RF era—or rely on added mitigations. Terrain Series takes a different approach.
- Integrated Digital Signal Processing
- Embedded RF filtering
- Designed‑in resilience—not bolt‑on fixes
The result is altitude performance operators can trust without operational compromises or added system complexity.
Modern Capability Without Fleet Disruption
Terrain Series radar altimeters are retrofit‑optimized to help operators modernize while minimizing downtime and integration risk.
- Compatible with analog and digital cockpits
- Supports reuse of existing equipment
- Flexible configurations for diverse fleet needs
Outcome: a practical upgrade path to modern performance—without grounding aircraft longer than necessary.
Experience That Shows in the Air
The Terrain Series includes multiple configurations to support a wide range of operational requirements. Each radar altimeter is backed by FreeFlight Systems’ decades of avionics expertise—supporting operators worldwide with flight‑critical solutions designed to enhance safety in today’s real‑world conditions.
Take the Next Step Toward Confident Altitude Performance
Learn how Terrain Series radar altimeters can support your operation in today’s ever evolving RF‑dense airspace.
TERRAIN SERIES Frequently Asked Questions
Why do I need a 5G-tolerant radar altimeter?
While some countries have stated that 5G networks won’t interfere with radar altimeters, pilots have reported real-world issues—including erratic altitude readings, autopilot disengagements, and false terrain warnings—even in areas without official advisories. TERRAIN SERIES radar altimeters are engineered to resist 5G C-Band interference, ensuring reliable altitude data during low-altitude operations, approaches, and landings—especially in RF-dense environments.
Are TERRAIN SERIES altimeters compliant with current regulations?
Yes. TERRAIN SERIES radar altimeters meet the latest MOPS standards, including AD 2023-10-02 and AD 2023-11-07, and are certified to TSO-C87a, DO-160G, and DO-178C Level B. This ensures compliance with FAA and international aviation authorities.
Can I retrofit TERRAIN SERIES altimeters into my existing aircraft?
Absolutely. TERRAIN SERIES models are designed for retrofit flexibility, with minimal impact to existing antennas, indicators, and cabling. The RA-4500 MK II, RA-5500, and RA-6500 support both analog and digital integration for legacy and modern platforms.
What types of aircraft are supported?
TERRAIN SERIES altimeters are compatible with a wide range of platforms, including rotorcraft, fixed-wing, business jets, commercial airliners, UAM/AAM vehicles, and military aircraft. Each model is optimized for specific operational needs and installation environments.
How do TERRAIN SERIES altimeters improve operational safety?
By delivering precise Altitude Above Ground Level (AGL) readings—even in low visibility or RF-dense environments—TERRAIN SERIES altimeters enhance situational awareness, reduce accident risk, and support safe landings and low-altitude maneuvers.
What makes TERRAIN SERIES different from other radar altimeters?
TERRAIN SERIES radar altimeters are built from the ground up with next-generation RF circuitry and Digital Signal Processing (DSP) to mitigate 5G interference—without requiring external monitoring systems for filter performance. Unlike legacy systems, they offer SWaP-optimized designs, retrofit flexibility, and multi-interface support for seamless integration across modern and legacy aircraft platforms.
Precision Altitude Starts Here—Download the Brochure.
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