Flight security systems
TAWS and TCAS/ACAS II
TAWS is a security system designed for warning signals generation in case of earth hazardous proximity, providing terrain features and flight direction at airborne display in respect to ground obstacles.
According to RF Ministry of Transportation order №128 from 31.08.2009 helicopters with maximum takeoff weight more than 3100 kg and other airborne vehicles with maximum takeoff weight more than 5700 kg or designed to carry 9 and more passengers must be equipped with ground proximity warning system with ground relief estimation function and automatic information distribution to a flight crew along with ground proximity warning signals.
TAWS system meets the requirements of TCAS II and provides cabin crew with collision avoidance recommendations. TCAS II estimates distance, bearing and relative altitude of surrounding airplanes using onboard transponder in mode C and mode S. TCAS II provides aircrafts with cooperative manoeuvre coordination to avoid a collision.
According to RF Ministry of Transportation order №128 from 31.08.2009 (edited version of 16.11.2011 N 284) all aircrafts equipped with turbo-engine with maximum takeoff mass more than 5700 kg or designed to carry 19 and more passengers, and also all general aviation aircrafts with maximum takeoff mass more than 15000 kg or designed to carry 30 and more passengers must be equipped with collision warning system.
TAWS system is up-to-date airborne equipment for flight safety improvement. It combines traditional collision warning system’s functions and such new functions as terrain features estimation, RAAS mode. Due to TAWS warning a pilot has enough time to avoid hazardous situation without disrupting passengers comfort.