04A_Radar Altimeter[1].doc
DOC document 28 KB Posted
- Attached to
- Radar Altimeter
- Solicitation number
- RFQ - 04A - 10092000000000000324
- Issued by
- Kennebec County, Maine
About this file
This technical specification document outlines the features and performance requirements for a Radar Altimeter TRA-3500/TRI-40 system. The equipment is designed for aircraft applications, featuring an altitude measurement range of 0 to 2,500 feet with dual antenna configuration and LED display capabilities. The system operates on 27.5 VDC power with a 750 mA requirement and maintains functionality across extended environmental conditions, with the TRI unit rated from -4°F to +131°F and the TRA unit from -40°F to +158°F. Key operational specifications include a 4.3-GHz center frequency, display update rate of two times per second, and altitude accuracy ranging from 5 feet at 0-100 feet up to 7 percent accuracy at 500-2,500 feet. The device incorporates decision height selection in configurable increments and provides both visual and aural alert capabilities, including an internal decision height light and 1-kHz tone output.
The system includes advanced safety and operational features such as gear warning with internal light and audible tone, an anti-hover circuit to prevent altitude wandering during helicopter operations, and self-test capabilities that display sequential diagnostic indicators. The equipment provides ARINC analog outputs with two configurable output channels and eight fixed trip point outputs ranging from 100 to 800 feet. Additional functionality includes visual display disable capability through strut switch inputs and external indicator drive options. The radar altimeter carries PMA (Parts Manufacturer Approval) certification, indicating compliance with Federal Aviation Administration requirements for aircraft component manufacturing and performance standards.
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Text version
Radar Altimeter
TRA-3500/TRI-40
SPECIFICATIONS:
Altitude Range: 0 to 2500 ft.
Power Requirements: 27.5 VDC; ±20%, 750 mA
Environmental: TRI: -4°F to +131°F (-20°C to +55°C)
TRA: -40°F to +158°F (-40°C to +70°C)
Alt: -45,000 ft. (13,716 m)
Size (HxWxL): TRI: 1.375 x 3.5 x 7.5 in.
TRA Unit: 3 x 3 x 6.9 in.
Weight: TRI: 0.75 lbs.
TRA Unit/Ants.: 3.25 lbs.
Antenna(s): Dual; ±20° pitch, ±30° roll
Display Type: LED, yellow seven segment, auto dim
Transmitter Power: 20 mW minimum
Frequency: 4.3-GHz center frequency sweep,
4.25 to 4.35 GHz
Display Update Rate: 2 times/sec.
Altitude Accuracy: 0 to 100 ft. ±5 ft.
100 to 500 ft. ±5%
500 to 2500 ft. ±7%
Decision Height Selection: 50-ft. increments to 600 ft.
100-ft. increments to 900 ft.
Flag(s): Displays “U” when unlocked
Self-Test: Indicates “8’s,” then DH and gear lights, then 40 ft. altitude
Visual DH Alert: Internal DH light; External output
Aural DH Alert: 1-kHz tone output
Gear Warning: Internal gear light, audible tone, and external indicator drive
ARINC Analog Outputs: A: 2.5 mV/ft., 0 V=0 ft.
B: 20 mV/ft., 400 mV=0 ft.
Trip Point Outputs: Eight fixed trip points; 100 to 800 ft.
Display Disable: Two strut switch inputs—ground or line
Anti-Hover Circuit: Prevents altitude wandering while helicopter is hovering
CERT I F I C ATIONS:
PMA
File details come from the government source that posted it. Updated .