Part #:

Model: GRA-55

Garmin - Radar Altimeter System
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Part Number :


GRA 55
FEATURES
  • Radar Altimeter
  • Cost-sensitive solution for helicopter and GA aircraft based on the GRA 5500 architecture
  • All-digital design provides smooth, consistent readout
  • Highly accurate, rugged and reliable
  • Interfaces with the GI 205 stand-alone indicator, Garmin flight displays and 3rd party equipment
  • Optimal solution for operators equipping for NVIS operations
  • For Part 135 helicopter operators, the GRA 55 fulfills the radar altimeter equipage requirement established by the FAA for adoption by 4/24/17
  • Patented technology offers a simpler installation that can provide weight and cost savings by eliminating long lengths of antenna cabling
EQUIPMENT COMPATIBILITY
  • Compatible Garmin Flight Displays* (via ARINC 429):

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

SPECIFICATIONS

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: 25,000 ft maximum
  • Software Compliance: RTCA/DO-178B Level C
  • Hardware Compliance: Not Applicable - The GRA 55 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. See the Environmental Qualification Form for details on surge ratings and minimum/maximum operating voltages
  • Power Consumption: 13.75 W maximum (0.5 A at 27.5 VDC, 1.0 A at 13.75 VDC)

 

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