Retrofit-Ready Avionics

The panel is already open. Do it once.

RANGR-IQ SERIES
ADS-B In & TCAS II hybrid surveillance

TERRAIN SERIES
5G-tolerant radar altimetry, 1.30 lb

1203C GNSS/SBAS
Certified ADS-B position and timing source

Certified equipment already flying on commercial, rotorcraft, and military fleets.

1.30 lb

TERRAIN SERIES sensor weight, less than half of any competitor publishing a figure

TSO-C87a

Radar altimetry certified, with DO-160G and DO-178C Level B

100,000 hr

1203C field MTBF, meaning fewer removals over the life of the airframe

Multi-Platform

Designed for fixed-wing, rotorcraft, and military airframes

Pilot & Operator Value

Enhanced Safety and Operations

The equipment that asks less of the crew is the equipment doing its job best.

Less time interpreting the display, more time flying the aircraft
Fewer nuisance alerts and unexpected autopilot disconnects
Consistent behavior across a mixed fleet, so training carries between airframes
Fewer removals, less AOGs

Surveillance

One traffic picture, not two.

ADS-B and TCAS II returns for the same aircraft are consolidated into a single target. Fewer duplicates, less distraction, faster decisions.

Altimetry

AGL that holds when it matters.

Reliable AGL through all phases of flight and terrain transitions, including in low visibility and RF-dense airspace.

Navigation

Precise position in every phase of flight.

Multi-region SBAS with KASS and SouthPAN, RAIM integrity monitoring, and recovery from minor active spoofing events.

The portfolio

Built to leave the hangar on schedule.

Retrofit risk is schedule risk. Here is what each product line takes out of the install.

Radar altimeters

TERRAIN SERIES

RA-4500 MK II, RA-5500, RA-6500

C-band mitigation is internal to the unit. No external filter to source, mount, and wire, and no antenna relocation to coordinate with the airframe.

1.30 lb against 3.06, 3.50, and 4.70 for the units it replaces
Analog output on RA-5500 and RA-6500 keeps legacy antennas, indicators, and cabling
RA-4500 MK II drops into RA-4000 and RA-4500 installations
RS-485/422, RS-232, ARINC 429 and 552A
Optional RAD-45 panel indicator, NVG capable

ADS-B In and Out with TCAS II fusion

RANGR-IQ

978 / 1090 dual-band, 0.94 lb

Integrates with Collins Pro Line 21 and Universal Avionics InSight Flight Deck. The transponder stays. The displays stay.

Personality module carries configuration across the fleet
TSO-C154c, TSO-C166b, and TSO-C195b certified
Ethernet, ARINC 429, RS-232 multi-interface
Optional internal GPS, or pairs with the 1203C position source
Diversity antenna support and UAT anonymous mode
Under 1 lb, 1.7 x 5.0 x 5.5 in.

GNSS/SBAS position source

1203C Receiver

TSO-C145c Class Beta 1

Extensive STC coverage across Part 23 and Part 25, and approval under AC 20-165B. The approvals are already written.

Retrofit-ready from day one

Designed for the aircraft that already exists.

Every unit is built for airframes already flying. That the same box integrates cleanly as a line-fit solution follows from designing it that way, not the reverse.

Mitigation built in, not bolted on. Every competing answer adds a filter, a relocation, or a replacement unit
Half the weight of any competitor publishing a figure
Fusion without a Part 25-class installation
One supplier across position, surveillance, and altimetry

The call gets answered

An aircraft on jacks waiting on a callback is the most expensive part of any retrofit. Custom engineering support, STC documentation, and compliance guidance, backed by a global service network and a two-year standard warranty.

NEXt step

Check aircraft for compliance

Radar altimeter directives are already in force in the US and Canada, and the FAA rule signed July 24, 2026 sets a compliance date beyond them. Five questions will tell you which of those reach your fleet.

sales@freeflightsystems.com