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Part #: 010-00946-00

Model: GRA5500




Digital Radar Altimeter

Part Number :

GRA 5500
  • High-performance all digital radar altimeter
  • Used on transport category, helicopter, business and general aviation aircraft
  • Patent pending digital signal processing technology
  • Provides smooth altitude tracking resulting in consistent and highly accurate altitude above ground indication, even over environments like rough terrain, tree canopies, sand and choppy water
  • Works up to 2,500 ft above ground level
  • 1.5 foot accuracy
  • Simplified installation procedure
  • Eliminates the requirement for long lengths of antenna cables traditionally required in the installation of radar altimeters
  • Built-in self-test monitors continuously cross check data and system integrity, assuring the pilot of an accurate measurement of the height above ground
  • Industry-standard ARINC 429 interface allows the GRA 5500 to integrate with a breadth of Garmin integrated flight decks and flight displays (see Equipment Compatibility table below), as well as third-party products
  • Able to integrate with existing systems to enhance NVIS operations and fulfill the radar altimeter requirements for Class A TAWS, CAT II ILS operations and TCAS II/ACAS II
  • Compatible with Garmin's new TCAS II/ACAS II
  • Has been selected as standard equipment on new aircraft including Cessna Citation X, Citation Sovereign, Citation Latitude, Citation Longitude, and the Bell Helicopter 525 Relentless
  • Has received the FAA's Technical Standard Order (TSO) authorization
  • Compatible Garmin Flight Displays* (via ARINC 429):
  • Compatible Garmin Flight Decks*:
    • G5000
    • G5000H
    • G3000
    • G2000
    • G1000
    • G1000H

*Requires software versions compatible with support for display of radar altimeter


Physical Characteristics:
  • Unit Height (with mounting rack): 3.99" (101.3 mm)
  • Unit Width (with or without mounting rack): 3.02" (76.7 mm)
  • Unit Depth (with mounting rack and connector): 11.62" (295.2 mm)
  • Unit Depth (with mounting rack, connector and configuration module): 12.08" (306.9 mm)
  • Unit Weight (with mounting rack): 3.5 lbs (1.6 kg)
  • Typical Mating Circular Connector Weight: 0.13 lbs (0.06 kg)
  • Typical Mating RF Connector Weight (2X): 0.07 lbs (0.03 kg) (weight listed is for 2 connectors) 
General Specifications:
  • Operational Temperature Range: -55° C to +85° C
  • Altitude Range: 55,000 ft maximum
  • Software Compliance: RTCA/DO-178B Level B
  • Hardware Compliance: Not Applicable - The GRA 5500 does not contain any complex or programmable logic devices
  • Environmental Conditions: RTCA/DO-160F
Performance Specifications:
  • Altitude Accuracy: ± 1.5 ft (3 - 100 ft AGL); ± 2 % (> 100 - 2500 ft AGL)
  • Altitude Range: -20 - 2550 ft AGL
  • Altitude Alert Outputs Range: 0 - 2500 ft AGL
  • Altitude Output Time Constant: 0.1 second maximum
  • Transmitter Output: Frequency: 4.25 - 4.35 GHz "Gated" FMCW; Power: 1.0 W nominal
  • Horizontal Velocity: 0 - 200 knots maximum
  • Vertical Velocity: 20 ft/sec maximum (up to 100 ft AGL); 25 ft/sec maximum (above 100 ft AGL)
  • Pitch Angle: ± 20° maximum
  • Roll Angle: ± 20° maximum (with published altitude accuracy limits); ± 20° to ± 30° (with ± 20 % altitude accuracy limits throughout entire altitude range)
Power Requirements:
  • Supply Voltage: 14/28 VDC
  • Power Consumption: 13.75 W maximum (0.5 A at 27.5 VDC, 1.0 A at 13.75 VDC)


- Digital Radar Altimeter
Price Condition Status

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