Table C.22 -- ECs whose label begins with U

Label Groups Reference type References
UNCONTROLLED_AIRSPACE AIR_TRNSP UD none
UNDERGROUND_BUNKER MILITARY_SCIENCE IR [FACC, Annex A]
UNDERGROUND_DWELLING SHELTER IR [FACC, Annex A]
UNDERGROUND_WATER HYDROLOGY IR [FACC, Annex A]
UNDERMINED_LAND PHYSIOGRAPHY IR [FACC, Annex A]
UNDERWATER_COMM_DEVICE INFRASTRUCTURE UD none
UNDERWATER_HAZARD HYDROGRAPHIC_TRNSP IR [FACC, Annex A]
UNDERWATER_OBJECT HYDROGRAPHIC_TRNSP UD none
UNDERWATER_OBJECT_OR_REGION HYDROGRAPHIC_TRNSP IR [FACC, Annex A]
UNDERWATER_REGION HYDROGRAPHIC_TRNSP UD none
UNVEGETATED_LAND PLANT IR [FACC, Annex A]