Picture of product TRA3500

Part #:

Model: TRA3500




Radar Altimeter System

Part Number :


  • Lightweight radio altimeter transceiver designed for transport category aircraft, helicopter, and seaplane operations
  • Used in conjunction with TRI-40 (14 Volt) Indicator and dual antenna system
  • "Anti-hover" capability prevents altitude wandering while hovering in helicopter
  • Provides precise AGL information from 2500 feet down to ground level
  • 28 Volt power input
  • ARINC analog outputs allow integration with other on-board equipment such as flight director systems
  • Internal gear warning light aural and visual out
  • Eight fixed trip point outputs
Dimensions: 1.375"W x 2.5"H x 7.5"L Weight: 3.25 lbs.
Power Requirements: 27.5 VDC, 750 mA Transmit Power: 20 mW minimum
Frequency: 4.3-GHz center frequency sweep, 4.25 to 4.35 GHz Accuracy: 40-100 ft. +-5 ft 100-500 ft. +-5% 500-2500 ft. +-7%
Part Number Radar Altimeter Description:
1901-3500-00 Basic TRA-3500 (Unit Only)
TRA-3500/TRI-40 Shipset 1  Complete System (Basic TRA-3500 Version)
TRA-3500/TRI-40 Shipset 2 Complete System (with Alt Trip Points)
TRA-3500/TRI-40 Shipset 3 Complete System (with NVG)
TRA-3500/TRI-40 Shipset 4 Complete System (with Alt Trip Points & NVG)
* "Shipset" Part Numbers are for REFERENCE ONLY - Items must be purchased separately. Attached PDF listings are for Reference Only & are subject to change.


Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact questions@seaerospace.com

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.

Although not a direct replacement, the FreeFlight RA-4500 can be used to replace the Receiver/Transmitter in the TRA-3500 radar altimeter system.  Please order/reference the RA-4500 Sensor System.

Yes. Free Flight uses part number 9-1203-115-00 in their catalog and installation manual for the radar altimeter antenna used in their RA3500, RA4000, and RA4500 systems. When you inspect these antennas, they are packaged in a Sensor Systems box with the 9-1203-115-00 part number label on the outside of the box. When you open the Sensor Systems box, you can immediately see that it is actually the Sensor Systems S67-2002 antenna. The antenna has the S67-2002 part number on its dataplate.