AVIONICS
displays storm intensity levels in bright colors against a black background utilizing the advanced displays installed on the fl ight deck. The Primus 660 is a high-power (10 KW) system that provides the fl ight crew with high-confi dence, tactical weather avoidance to manage the overall fl ight of the helicopter. The Primus 660 weather radar system meets the following
DMU Attitude Heading Reference
System (AHRS) In terms of attitude and heading sensors in the AW-139, the days of a separate displacement type vertical gyro for actual aircraft pitch and roll attitude data, and a displacement type directional gyro for heading information are not required. Instead, the AW-139 employs a laser fi beroptic gyro (FOG) inertial attitude and heading sensor system. The AHRS rate based fi beroptic gyros provide the helicopter’s actual pitch and roll attitude, magnetic heading and other fl ight dynamics data to the EDS, FMS and AFCS. The AHRS also provides data for weather radar antenna stabilization, and any other systems that require attitude, heading, rate and accelerometer data. In addition to the FOGs, the AHRS utilizes
micromechanical accelerometers aligned with the aircraft’s primary axes to supply an inertial measuring system. A separate fl ux valve is used for each system (pilot and copilot), to provide a long term magnetic reference. The air data system (ADS) provides a true airspeed (TAS) input to help in the calculations of pitch and roll attitude. The AHRS can provide inertial altitude and vertical speed data if it receives a pressure altitude input from the ADS. It can also provide true velocity and groundspeed data if it is connected to a GPS receiver.
LCR-93 AHRU
requirements: • Combined receiver/transmitter with fl at-plate antenna (RTA) • WU-660 WX radar controller.
Integrated receiver/transmitter antenna (RTA) has a: • 10 kW transmitter
• 12-inch high-gain fl at-plate antenna • Attitude stabilization • Provides a four-color display • Provides fi ve-mile to 300-mile ranges • Provides enhanced modes and controls:
• Rain echo attenuation compensation technique (REACT)
• Ground mapping (GMAP • Target alert (TGT)
Primus 660 RTA
WX Displayed on HSI Portion of PFD
WU-660 Weather Radar Controller
The Honeywell Primus 700/701 weather radar system is off ered as an option on the AW-139 helicopter.
AHRU/Flux Valve/Compass Controller Primus 660 Weather Radar
System (WX) The weather radar system in the AW-139 helicopter is Honeywell’s Primus 660. The Primus 660 weather radar system is an X-band, four-color, digital radar designed for airborne weather detection and avoidance. The system
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HelicopterMaintenanceMagazine.com April | May 2015
AA-300 Radio Altimeter System (RA) The RT-300 radio altimeter provides absolute altitude above the terrain or whatever is beneath the helicopter from zero to 2,500 feet. The readout is displayed on both PFDs. The receiver/transmitter (RT) connects to both transmitter and receiver antennas. There is a zero height adjustment on the front of the R/T unit as this unit can be mounted in a variety of aircraft, and the antennas can be at diff erent heights above the ground depending on the aircraft and installation location. The radio altimeter also provides a trip point for the decision height (DH) annunciation on the PFDs and a
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