About: http://webisa.webdatacommons.org/323458090

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Aircraft which encounter mechanical or other difficulties--lack of fuel, battle damage, weather conditions, or other reasons--can use the system to identify themselves by switching their IFF to the EMERGENCY code position.
http://www.w3.org/ns/prov#wasQuotedFrom	ibiblio.org