var TREE_ITEMS = [
	['Complete Radio Systems', null,
		['Radar and air traffic control system ', 0,
			['Long range Radar And Display System (LORADS II)'],
			['Long range Surveillance Radar (LSR)'], 
			['Approach Surveillance Radar (ASR)'],
			['Airfield Surface Detection Equipment (ASDE) '],
			['Multilateration surveillance system'],
		],
		['Navigation Aids ',0,
			['Instrument Landing Systems (ILS) '],
			['Doppler VOR and Conventional VOR systems (DVOR/CVOR) '],
			['Non Directional Beacons (NDB) '],
			['Distance Measuring Equipment (DME) '],
			['Tactical Air Navigation system (TACAN) '],
			['Satellite Navigation Systems (DGPS) '],
			['CNS Ground Station '],
			['Mode S Airport Ground Sensor (MAGS) '],
			['Radio Direction Finding Systems (DFS)'],
		],
		['Meteorological systems',0,
			['Doppler and Dual Polarisation Weather Radar'],
			['Airport Weather Observing Systems (AWOS)'], 
			['Surface Automatic Weather Stations Networks '],
			['International system SADIS (Satellites data transmission) '],
			['Wind direction and Velocity measurement Visibility, Runway Visual Range (RVR)']
		],
		['Communication systems',0,
			['Airport communication systems'],
			['Trunked radio systems '],
			['HF/VHF/UHF radio systems '],
			['Mobile ATC Towers '],
			['AFTN message switch '],
			['Automated aeronautical information service systems']
		],
		['Security systems',0,
			['Airport-wide CCTV coverage']
		],
		['Training and Simulation systems',0,
			['ATC Tower Simulator']
		],
		['Search and Rescue system',0,
			['Satellite INMARSAT Reception System'],
			['Satellite COSPAS-SARSAT Reception System '],
			['Direction Finder for Distress frequencies '],
			['Radio Transceivers for Distress frequencies']
		]
	]
];