KRA-405B Radar Altimeter
Overview
The KRA-405B Radar Altimeter (RADALT) is a lightweight, solid-state, airborne altimeter that provides accurate altitude measurements above terrain during various portions of flight. The KRA 450B Radar Altimeter systems include the KRA45B Receiver/ Transmitter, and optional KNI 415 (fixed wing) or KNI 416 (helicopter) Radar Altimeter Indicators, two KA 54A antennas, and an optional CM 2000 Configuration Module. (This module is only needed for installations where trip points will be set to values other than the factory settings, or for installations requiring a zero feet offset.)
The KRA 405B Receiver / Transmitter can be rigid or shock mounted, and it can be mounted using the same rack as the KRA 405. In addition, the unit can be easily mounted directly onto the airframe, increasing your mounting options, and helping make valuable space available for other avionics equipment.
Performance Within 5G Cellular Environment
In collaboration with the FAA and RTCA, Honeywell has performed radio frequency testing on the KRA405B radar altimeter to assess its ability to meet its minimum operating performance specifications when subjected to radio frequency energy from 5G cellular base stations. The KRA-405B requires the installation of an external bandpass filter between the radar altimeter receive antenna and the radar altimeter receive input. The external bandpass filter reduces the unit’s susceptibility to interference from 5G base stations.
Aircraft using the KRA-405B radar altimeter with the external bandpass filter are able to obtain Alternative Means of Compliance (AMOC) to the FAA Airworthiness Directives 2021- 23-12 (fixed-wing) and 2021-23-13 (helicopters) that were introduced by FAA in December 2021. The bandpass filter is part number 68013467-001 and is available from Honeywell today. Contact us for for bandpass filter pricing and availability.
The KRA 405B Receiver / Transmitter can be rigid or shock mounted, and it can be mounted using the same rack as the KRA 405. In addition, the unit can be easily mounted directly onto the airframe, increasing your mounting options, and helping make valuable space available for other avionics equipment.
Performance Within 5G Cellular Environment
In collaboration with the FAA and RTCA, Honeywell has performed radio frequency testing on the KRA405B radar altimeter to assess its ability to meet its minimum operating performance specifications when subjected to radio frequency energy from 5G cellular base stations. The KRA-405B requires the installation of an external bandpass filter between the radar altimeter receive antenna and the radar altimeter receive input. The external bandpass filter reduces the unit’s susceptibility to interference from 5G base stations.
Aircraft using the KRA-405B radar altimeter with the external bandpass filter are able to obtain Alternative Means of Compliance (AMOC) to the FAA Airworthiness Directives 2021- 23-12 (fixed-wing) and 2021-23-13 (helicopters) that were introduced by FAA in December 2021. The bandpass filter is part number 68013467-001 and is available from Honeywell today. Contact us for for bandpass filter pricing and availability.
Specifications
Key Differentiators
Certifications
- DO-155 (minimum performance specification - airborne low-range altimeters)
- DO-160B (environmental conditions and test procedures for airborne equipment)
- DO-178B Level A (software considerations in airborne systems and equipment certification)
- TSO C87/ETSO-2C87 (1997) airborne low-range radio altimeter
Dimensions
Width
- 3.00 in.
- 7.62 cm
Weight
- 3 pounds
Dimensions
- 3 x 3.5 x 11 in
Performance Data
Accuracy
- ± 3 ft or ±3%, < 500ft. ±5%, >500ft Percentage
Primary Power
- 27.5V dc ± 20% at 850 V dc mA nominal
Output
- Analog and digital
Operating Temperature
- -55°C to 70°C
Operating Range
- 0 to +2500 feet
Non-operating Temperature Range
- -55°C to 85°C
Frequency
- 4.2 GHz to 4.4 GHz hertz
Centre Frequency
- 4300 ± 15 Mhz
Aircraft Altitude
- +0.5 V dc maximum at less than 250 mA
- 10 A maximum at less than 30 V dc
Compatible Platform
- Bell 429
- Embraer E2
