Table 6.5 — EAs whose label begins with A

Label Concept definition Attribute value type EQ label Code
ABSOLUTE_ELEVATION_ACCURACY The 90th percentile of error in an <<ELEVATION>>; the absolute elevation accuracy. REAL LENGTH 1
ABSOLUTE_HORIZONTAL_ACCURACY The 90th percentile of horizontal circular error of a <LOCATION> relative to a defined standard; the absolute horizontal accuracy. REAL LENGTH 2
ABSOLUTE_HUMIDITY The ratio of the <<MASS>> of water vapour to the <<VOLUME>> occupied by the mixture of water vapour and dry <AIR>; the absolute humidity. REAL MASS_FRACTION 3
ABSOLUTE_LATITUDE_ACCURACY The 90th percentile of angular error of a geodetic latitude value of a <LOCATION> relative to a <SURFACE_DATUM>; the absolute latitude accuracy. REAL PLANE_ANGLE 4
ABSOLUTE_LONGITUDE_ACCURACY The 90th percentile of angular error of a geodetic longitude value of a <LOCATION> relative to a <SURFACE_DATUM>; the absolute longitude accuracy. REAL PLANE_ANGLE 5
ABSOLUTE_VERTICAL_ACCURACY The vertical accuracy of a <LOCATION> relative to a defined standard expressed in units of length at 90% linear error; the absolute vertical accuracy. REAL LENGTH 6
ACCESS_DIRECTION_TYPE The type of access direction of an <OBJECT> in reference to allowable traffic flow. ENUMERATION   7
ACCESSIBILITY_STATUS The type of accessibility of an <OBJECT>. ENUMERATION   8
ACCUM_PRECIP The depth of <PRECIPITATION> (water-equivalent) that accumulated over a measurement <<TIME_QUANTITY>>. REAL LENGTH 9
ACCUM_PRECIP_24_HOUR The <<ACCUM_PRECIP>> during a 24-hour <<TIME_QUANTITY>>. REAL LENGTH 10
ACCUM_PRECIP_24_HOUR_DENSITY The <<ACCUM_PRECIP_24_HOUR>> expressed as a surface density. REAL SURFACE_DENSITY 11
ACCUM_PRECIP_3_HOUR The <<ACCUM_PRECIP>> during a 3-hour <<TIME_QUANTITY>>. REAL LENGTH 12
ACCUM_PRECIP_3_HOUR_DENSITY The <<ACCUM_PRECIP_3_HOUR>> expressed as a surface density. REAL SURFACE_DENSITY 13
ACCUM_PRECIP_6_HOUR The <<ACCUM_PRECIP>> during a 6-hour <<TIME_QUANTITY>>. REAL LENGTH 14
ACCUM_PRECIP_6_HOUR_DENSITY The <<ACCUM_PRECIP_6_HOUR>> expressed as a surface density. REAL SURFACE_DENSITY 15
ACCUM_PRECIP_DENSITY The <<ACCUM_PRECIP>> expressed as a surface density. REAL SURFACE_DENSITY 16
ACCUMULATION_PERIOD The <<TIME_QUANTITY>> prior to the referenced time over which a <MATERIAL> has accumulated; the accumulation period. REAL TIME 17
ACCUMULATION_PERIOD_CATEGORY The category of an <<ACCUMULATION_PERIOD>>. ENUMERATION   18
ACOUSTIC_BOUNDARY_LOSS The quantity of acoustic energy that is lost at a specific angle due to interaction of an acoustic signal waveform with either the <WATERBODY_SURFACE> or the <WATERBODY_FLOOR>; the acoustic boundary loss. REAL FIELD_OR_POWER_LEVEL_DIFF 19
ACOUSTIC_CENTRE_FREQUENCY_BAND The electro-acoustic one-third-octave band centre <<FREQUENCY>> (approximate). ENUMERATION   20
ACOUSTIC_HALFCHANNEL-
_OBSERVATION_FRACTION 		A number between 0 and 1 inclusive representing the fraction of observations indicating the presence of an acoustic half-channel in a <WATERBODY>. REAL PURE_NUMBER 21
ACOUSTIC_NOISE_MARGINAL_ICE-
_ZONE_MULTIPLIER 		The correction factor applied to underwater sound levels that incorporates acoustic noise related to an <AIRCRAFT> operating in the marginal ice zone. REAL PURE_NUMBER 22
ACOUSTIC_NOISE_SPECTRAL-
_CURVE_CORRECTION 		The acoustic noise level correction obtained from a spectral class curve to be applied to some base acoustic noise level in a <WATERBODY>; the acoustic noise spectral curve correction. REAL FIELD_OR_POWER_LEVEL_DIFF 23
ACOUSTIC_PWR_LVL_BAND The power level of acoustic energy in a <WATERBODY> measured one metre from the source acoustic centre in a defined frequency band. REAL PRESSURE_POWER_LEVEL 24
ACOUSTIC_PWR_LVL_SPECTRUM The ratio of sound wave intensity in a <WATERBODY> in a one hertz band to a reference intensity measured one metre from the source; the acoustic power level spectrum. REAL PRESSURE_POWER_LEVEL 25
ACOUSTIC_PWR_LVL_SPECTRUM-
_CORRECTION 		The omnidirectional ambient noise spectrum level correction in a <WATERBODY> at a specified <<FREQUENCY>> referenced to a 50 hertz reference level; the acoustic power level spectrum correction. REAL FIELD_OR_POWER_LEVEL_DIFF 26
ACOUSTIC_REFLECTION_TYPE The type of acoustic reflection from a <WATERBODY_FLOOR>. ENUMERATION   27
ACOUSTIC_REFLECTOR An indication that an <OBJECT> reflects acoustic energy in a specified band of <<FREQUENCY>>s; acoustic reflector. BOOLEAN   28
ACOUSTIC_SCATTERING_STRENGTH The column (integrated) acoustic scattering strength (ratio of returned to incident energy) in a <WATERBODY>. REAL AREIC_POWER_LEVEL_DIFF 29
ACOUSTIC_TARGET_STRENGTH The ratio of the intensity of sound returned by a sonar target at a distance of one metre from the acoustic centre of the target in a specified <DIRECTION> to the incident intensity from a distant source; the acoustic target strength. REAL FIELD_OR_POWER_LEVEL_DIFF 30
ACOUSTIC_TRANSMISSION_LOSS The acoustic <<TRANSMISSION_LOSS>>. REAL FIELD_OR_POWER_LEVEL_DIFF 31
ACOUSTIC_VOLUME_LAYER-
_SCATTERING_STRENGTH_FREQUENCY 		The acoustic <<FREQUENCY>> at which a volume layer scattering strength in a <WATERBODY> is reported. REAL FREQUENCY 32
ACTIVE_ACOUSTIC An indication that an <OBJECT> generates intentional emissions of acoustic energy used for the purposes of detection, localization, and/or identification; active acoustic. BOOLEAN   33
AERIAL_COUNT The number of distinct <AERIAL>s on a <STRUCTURE>; the aerial count. COUNT   34
AERIAL_FUNCTION The function of an <AERIAL>. ENUMERATION   35
AERIAL_TYPE The structural type of an <AERIAL>. ENUMERATION   36
AERODROME_ELEVATION The highest <<ELEVATION>> of the usable <RUNWAY>s of an <AERODROME>, measured from the MSL <SURFACE_DATUM>. REAL LENGTH 37
AERODROME_EMERGENCY_LIGHTING-
_INTENSITY 		A number between 0 and 1 inclusive representing the linearly-scaled fractional intensity of emergency <LIGHTING> at an <AERODROME>. Zero means no light and one means maximum intensity. REAL PURE_NUMBER 38
AERODROME_GATE_LIGHTING-
_INTENSITY 		A number between 0 and 1 inclusive representing the linearly-scaled fractional intensity of external gate <LIGHTING> at an <AERODROME>. Zero means no light and one means maximum intensity. REAL PURE_NUMBER 39
AERODROME_IDENTIFICATION The unique set of numbers preceded by the appropriate country code that enables an individual <AERODROME> to be uniquely identified within a database; the aerodrome identification. STRING   40
AERODROME_TYPE The type of an <AERODROME>. ENUMERATION   41
AERONAUTICAL_APPROACH_TYPE The type of an aeronautical approach. ENUMERATION   42
AERONAUTICAL_FUNCTION The function of an aeronautical <OBJECT>. ENUMERATION   43
AERONAUTICAL_LIGHT_TYPE The type of <LIGHTING> or <SYSTEM> of <LIGHTING> that supports aeronautical navigation; the aeronautical light type. ENUMERATION   44
AERONAUTICAL_OBSTRUCTION-
_HEIGHT_ACCURACY 		The difference between the recorded <<HEIGHT_AGL>> of an <OBJECT> forming a <NATURAL_AIR_OBSTRUCTION> or <MAN_MADE_AIR_OBSTRUCTION> and its true <<HEIGHT_AGL>> at 90% probability; the aeronautical obstruction height accuracy. REAL LENGTH 45
AERONAUTICAL_POINT_FUNCTION The function of an aeronautical point <OBJECT>. ENUMERATION   46
AERONAUTICAL_ROUTE_TYPE The type of an <AIR_TRANSPORTATION_ROUTE>. ENUMERATION   47
AEROSOL_LAYER_BASE_LEVEL The vertical displacement of the lowest <SURFACE> of a layer of an <AEROSOL> identified by an <<ATM_VERTICAL_REFERENCE>>; the aerosol layer base level. REAL LENGTH 48
AEROSOL_LAYER_TOP_LEVEL The vertical displacement of the highest <SURFACE> of a layer of an <AEROSOL> identified by an <<ATM_VERTICAL_REFERENCE>>; the aerosol layer top level. REAL LENGTH 49
AEROSOL_PARTICLE_CONCENTRATION The <PARTICLE> concentration of an <AEROSOL>. REAL VOLUMETRIC_ENTITY_DENSITY 50
AEROSOL_PARTICLE_TYPE The type of <PARTICLE> in an <AEROSOL>. ENUMERATION   51
AFTERBURNER_INDUCED_FLAME_RATE A number between 0 and 1 inclusive representing the linearly-scaled fraction of the production rate of visible flame that is induced by use of the afterburner of an <AIRCRAFT>; the afterburner induced flame rate. Zero means no production and one means maximum production. REAL PURE_NUMBER 52
AID_TO_NAVIGATION_COLOUR-
_PATTERN 		The colour pattern of an <OBJECT> (for example: an <AID_TO_NAVIGATION>, a <BUOY>, a <BEACON>, and/or a <NAVIGATION_LIGHT>) of importance to navigation. ENUMERATION   53
AID_TO_NAVIGATION_DESCRIPTION The textual description of <AID_TO_NAVIGATION>s that are marking an <OBJECT>.
EXAMPLE     Marked by <BUOY>s. 		STRING   54
AID_TO_NAVIGATION-
_EFFECTIVENESS_RADIUS 		The radius of effectiveness of an <AID_TO_NAVIGATION>. REAL LENGTH 55
AID_TO_NAVIGATION_MARK_COLOUR The colours of an <AID_TO_NAVIGATION> mark. ENUMERATION   56
AID_TO_NAVIGATION_MARK_SYSTEM The specific <SYSTEM> of marks that serve as an <AID_TO_NAVIGATION> and to which an <OBJECT> conforms. ENUMERATION   57
AID_TO_NAVIGATION_MARKER_TYPE The type of a <MARKER> serving as an <AID_TO_NAVIGATION>. ENUMERATION   58
AID_TO_NAVIGATION_PRIMARY-
_OPERATING_RANGE 		The primary operating range of an <AID_TO_NAVIGATION> beyond which the capture of the signal is not completely assured. REAL LENGTH 59
AID_TO_NAVIGATION_RANGE The length of range established by <AID_TO_NAVIGATION>s on the <SHORE>. REAL LENGTH 60
AID_TO_NAVIGATION_SECONDARY-
_OPERATING_RANGE 		The secondary operating range of an <AID_TO_NAVIGATION> beyond which the capture of the signal is not completely assured. REAL LENGTH 61
AID_TO_NAVIGATION_STATUS The status of an <OBJECT> as an <AID_TO_NAVIGATION>. ENUMERATION   62
AID_TO_NAVIGATION_SYSTEM_TYPE The type of a <SYSTEM> of <AID_TO_NAVIGATION>s. ENUMERATION   63
AIR_DENSITY The <<MATERIAL_DENSITY>> of the <AIR>. REAL VOLUMIC_MASS 64
AIR_EXFILTRATION_RATE The rate at which interior <AIR> leaks out of a <STRUCTURE> expressed as the fraction of the <<VOLUME>> of <AIR> in the <STRUCTURE> per unit time; the air exfiltration rate. REAL RATE 65
AIR_INFILTRATION_RATE The rate at which exterior <AIR> leaks into a <STRUCTURE> expressed as the fraction of the <<VOLUME>> of <AIR> in the <STRUCTURE> per unit time; the air infiltration rate. REAL RATE 66
AIR_TEMPERATURE The <<TEMPERATURE>> of the <AIR> that would be indicated by a thermometer exposed to the <AIR> at a <LOCATION> sheltered from direct solar radiation. REAL THERMO_TEMPERATURE 67
AIR_TEMPERATURE_ERROR The error in a measurement of an <<AIR_TEMPERATURE>> that is introduced by uncertainties. REAL THERMO_TEMPERATURE 68
AIR_TEMPERATURE_PERIOD The <<TIME_QUANTITY>> over which the <<EXTREME_LOW_AIR_TEMPERATURE>> and/or the <<EXTREME_HIGH_AIR_TEMPERATURE>> are determined. REAL TIME 69
AIRCRAFT_CARRIER_CLASS The class of an <AIRCRAFT_CARRIER>. ENUMERATION   70
AIRCRAFT_FUNCTION The operating function of an <AIRCRAFT>. ENUMERATION   71
AIRCRAFT_ICING_INTENSITY The estimated intensity of the accumulation of <ICE> on exposed <SURFACE>s of an <AIRCRAFT> that is formed as the <AIRCRAFT> is flown through supercooled drops of <WATER> in <CLOUD>s or <RAIN>. ENUMERATION   72
AIRCRAFT_ICING_LEVEL_BASE-
_ALTITUDE 		The estimated <<ALTITUDE_MSL>> of the lower <SURFACE> of a layer in the <ATMOSPHERE> at which an <AIRCRAFT> can be expected to experience icing. REAL LENGTH 73
AIRCRAFT_ICING_LEVEL_TOP-
_ALTITUDE 		The estimated <<ALTITUDE_MSL>> of the upper <SURFACE> of a layer in the <ATMOSPHERE> at which an <AIRCRAFT> can be expected to experience icing. REAL LENGTH 74
AIRCRAFT_ICING_TYPE The type of <ICE> that is expected to accumulate on the <SURFACE> of an <AIRCRAFT>. ENUMERATION   75
AIRCRAFT_LANDING_GEAR-
_DEPLOYED_POSITION 		A number between 0 and 1 inclusive representing the linearly-scaled fractional deployment of the landing gear of an <AIRCRAFT>. Zero means fully retracted and one means fully deployed. REAL PURE_NUMBER 76
AIRCRAFT_LOAD_RESTRICTIONS The description of any load restrictions that apply to <AIRCRAFT> using a <FACILITY>. STRING   77
AIRCRAFT_PROPULSION_TYPE The type of propulsion of an <AIRCRAFT>. ENUMERATION   78
AIRCRAFT_TURBULENCE_BASE-
_ALTITUDE 		The <<ALTITUDE_MSL>> of the lower <SURFACE> of a layer of <ATMOSPHERE> that is turbulent to <AIRCRAFT>. REAL LENGTH 79
AIRCRAFT_TURBULENCE_FREQUENCY The rate of occurrence of turbulence experienced by <AIRCRAFT>; aircraft turbulence frequency. ENUMERATION   80
AIRCRAFT_TURBULENCE_INTENSITY The intensity of turbulence experienced by <AIRCRAFT>. ENUMERATION   81
AIRCRAFT_TURBULENCE_TOP-
_ALTITUDE 		The <<ALTITUDE_MSL>> of the upper <SURFACE> of a layer of <ATMOSPHERE> that is turbulent to <AIRCRAFT>. REAL LENGTH 82
AIRCRAFT_TYPE The type of an <AIRCRAFT>. ENUMERATION   83
AIRSPACE_ALTITUDE_LIMITS The description of the altitude limits of a <SPECIAL_USE_AIRSPACE> relative to a <<ATM_VERTICAL_REFERENCE>>. STRING   84
AIRSPACE_IDENTIFIER The textual identifier of an <AIRSPACE>. STRING   85
AIRSPACE_LIMITATION The type of <AIRSPACE> wherein activities must be confined because of their nature and/or wherein limitations may be imposed upon <AIRCRAFT> operations. ENUMERATION   86
AIRSPACE_OPERATING-
_RESTRICTIONS 		The status of an <AIRSPACE> and any operating restrictions that are applicable. STRING   87
AIRSPACE_TYPE The type of designated <AIRSPACE> within which some or all <AIRCRAFT> may be subject to air traffic control. ENUMERATION   88
ALBEDO The ratio of the reflected electromagnetic radiation to the total incident electromagnetic radiation incident upon a <SURFACE> (for example: a <PLANETARY_SURFACE>); albedo. REAL PURE_NUMBER 89
ALL_OBJECT_COUNT The number of <OBJECT>s of all types within a <REGION>; the all object count. COUNT   90
ALONGSHORE_CURRENT_SPEED The <<WATER_CURRENT_SPEED>> of a <WATER_CURRENT> paralleling a <SHORE>, largely within the <SURF_ZONE>, caused by the excess <WATER> brought to the <SURF_ZONE> by the small net mass transport of <WATER_WAVE>s induced by <WIND>; alongshore <WATER_CURRENT>s feed into rip <WATER_CURRENT>s. REAL SPEED 91
ALTITUDE_MSL The altitude relative to the MSL <SURFACE_DATUM>. REAL LENGTH 92
ANGULAR_SECTOR_WIDTH The angular width of an angular sector. REAL PLANE_ANGLE 93
ANTI_COLLISION_LIGHT_INTENSITY A number between 0 and 1 inclusive representing the linearly-scaled fractional intensity of external <LIGHTING> that is used to prevent collision with/between <VEHICLE>s; the anti-collision light intensity or brake light intensity. Zero means unlit and one means maximum intensity. REAL PURE_NUMBER 94
APERTURE_COVER_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fractional <<AREA>> of an <APERTURE> that is covered by <MATERIAL>s obstructing visibility. Zero means uncovered and one means completely covered. REAL PURE_NUMBER 95
APERTURE_COVER_POSITION The position of the covering (for example: a canopy and/or a hatch) of an <APERTURE>; the aperture cover position. ENUMERATION   96
APERTURE_LENGTH The length of the longer of two orthogonal linear axes of an <APERTURE> measured in the plane of the <APERTURE>; the aperture length. For a square <APERTURE>, either axis may be measured. For a round <APERTURE>, the diameter is measured. REAL LENGTH 97
APERTURE_OPEN An indication that an <APERTURE> is open. BOOLEAN   98
APERTURE_STATE The state of closure of an <APERTURE>. ENUMERATION   99
APERTURE_WIDTH The length of the shorter of two orthogonal linear axes of an <APERTURE> measured in the plane of the <APERTURE>; the aperture width. For a square <APERTURE>, either axis may be measured. For a round <APERTURE>, the diameter is measured. REAL LENGTH 100
APRON_HARD_STANDING_FUNCTION The function of an <APRON> or <HARD_STANDING>. ENUMERATION   101
AQUEDUCT_TYPE The type of an <AQUEDUCT>. ENUMERATION   102
AREA The area of the <OBJECT>. REAL AREA 103
ARMOURED An indication that an <OBJECT> is armoured. BOOLEAN   104
ARRESTING_GEAR_TYPE The type of <DEVICE> at the end of a <RUNWAY> that is used to stop <AIRCRAFT>; the arresting gear type. ENUMERATION   105
ASPECT_ANGLE The angle measured from the major axis of an <OBJECT> clockwise to the viewing <DIRECTION>; the aspect angle. Zero represents either the <DIRECTION> of motion, or other unique orientation along the primary axis, heading directly towards the observer. REAL PLANE_ANGLE 106
ASSAULT_LANDING_CRAFT_TYPE The type of a <LANDING_CRAFT> designed for amphibious assault operations. ENUMERATION   107
ASSOCIATED_TEXT Narrative or other textual description associated with an <OBJECT>; the associated text. STRING   108
ASW_CENTROID_PRESENT An indication that the centroid of an ASW operating <REGION> exists within the spatial extent of an associated <OBJECT>; ASW centroid present. BOOLEAN   109
ASW_WINGED_AIRCRAFT_TYPE The type of an <ASW_WINGED_AIRCRAFT>. ENUMERATION   110
ATM_BOUNDARY_LAYER_HEIGHT The <<HEIGHT_AGL>> of the lowest layer in the <ATMOSPHERE> in which meteorological conditions are affected significantly by the <PLANETARY_SURFACE> of the <EARTH>. The value is variable in time and space and ranges from tens of metres in strongly statically stable situations to several kilometres in convective conditions over <DESERT_REGION>s; the atmosphere boundary layer height. REAL LENGTH 111
ATM_CEILING Either the <<HEIGHT_AGL>> of the lowest <CLOUD> or obscuring phenomena layer aloft that covers half or more of the sky and is predominantly opaque or the vertical visibility into a surface-based obscuration; the atmosphere ceiling. REAL LENGTH 112
ATM_CEILING_METHOD The method used to determine the <<ATM_CEILING>>. ENUMERATION   113
ATM_FREEZING_LEVEL The lowest <<ALTITUDE_MSL>> at which the <<AIR_TEMPERATURE>> is 273,15 kelvin (zero degrees Celsius); the atmosphere freezing level. REAL LENGTH 114
ATM_LIQUID_WATER_MIXING_RATIO The ratio of the <<MASS>> of liquid <WATER> to the <<MASS>> of dry <AIR> in a unit <<VOLUME>> of <AIR>; the atmosphere liquid water mixing ratio. REAL VOLUMIC_MASS 115
ATM_PRESSURE The pressure exerted by an <ATMOSPHERE> on any <SURFACE> by virtue of its weight; the atmospheric pressure. REAL PRESSURE 116
ATM_PRESSURE_CHANGE The quantity of change in the <<ATM_PRESSURE>> over a measurement <<TIME_QUANTITY>>. REAL PRESSURE_CHANGE_RATE 117
ATM_PRESSURE_CHANGE_24_HOUR The absolute value of the <<ATM_PRESSURE_CHANGE>> over a twenty-four hour <<TIME_QUANTITY>>. REAL PRESSURE 118
ATM_PRESSURE_CHANGE_3_HOUR The absolute value of the <<ATM_PRESSURE_CHANGE>> over a three-hour <<TIME_QUANTITY>>. REAL PRESSURE 119
ATM_PRESSURE_CHANGE_QUALITY The quality of an <<ATM_PRESSURE_CHANGE_TENDENCY_CATEGORY>> measurement. ENUMERATION   120
ATM_PRESSURE_CHANGE_TENDENCY-
_CATEGORY 		The qualitative <<ATM_PRESSURE_CHANGE_3_HOUR>>; the atmospheric pressure change tendency category. ENUMERATION   121
ATM_PRESSURE_MEAN_CLIM The mean of historical (climatology) <<ATM_PRESSURE>>. REAL PRESSURE 122
ATM_PRESSURE_MEAN_CLIM_STD_DEV The standard deviation of historical (climatology) <<ATM_PRESSURE>> measurements. REAL PRESSURE 123
ATM_PRESSURE_QUALITY The quality of an <<ATM_PRESSURE>> measurement. ENUMERATION   124
ATM_PRESSURE_REDUCED_CLIM-
_STD_DEV 		The standard deviation of historical (climatology) <<ATM_PRESSURE_REDUCED_MSL>> measurements. REAL PRESSURE 125
ATM_PRESSURE_REDUCED_MSL The <<ATM_PRESSURE>> reduced to MSL using standard procedures. REAL PRESSURE 126
ATM_PROFILE_MEASUREMENT-
_TECHNIQUE 		The technique or method of collecting an <ATMOSPHERE_PROPERTY_SET> that is a series of measurements collected along a (roughly) vertical axis; the atmospheric profile measurement technique. ENUMERATION   127
ATM_TURBULENCE_TYPE The type of turbulence in the <ATMOSPHERE> experienced by <AIRCRAFT>. ENUMERATION   128
ATM_VERTICAL_REFERENCE The <SURFACE_DATUM> and accompanying method of reporting the vertical displacement to an <OBJECT> (for example: a level in an <ATMOSPHERE>) in an <ATMOSPHERE>; the atmosphere vertical reference. ENUMERATION   129
ATS_ROUTE_COMPONENT_LENGTH The <<LENGTH>> of an <ATS_ROUTE_COMPONENT>. REAL LENGTH 130
ATS_ROUTE_COMPONENT_LEVEL The flight level of an <ATS_ROUTE_COMPONENT>. ENUMERATION   131
ATS_ROUTE_COMPONENT_WIDTH The <<WIDTH>> of an <ATS_ROUTE_COMPONENT>. REAL LENGTH 132
ATS_ROUTE_LOWEST_ALTITUDE The lowest published altitude in effect along a <ATS_ROUTE_COMPONENT> that meets obstacle clearance requirements for the entire <ATS_ROUTE_COMPONENT> and that assures an acceptable navigation signal. REAL LENGTH 133
ATS_ROUTE_OPPOSITE_FLOW-
_DIRECTION 		The <DIRECTION> opposite to the flow of an <ATS_ROUTE_COMPONENT>. REAL PLANE_ANGLE 134
ATS_ROUTE_TYPE The type of an <ATS_ROUTE>. ENUMERATION   135
ATS_USE_TYPE The type of use of a designated ATS <AIRSPACE>. ENUMERATION   136
ATTACHED An indication that an <OBJECT> is attached to another <OBJECT>. BOOLEAN   137
ATTACK_WINGED_AIRCRAFT_TYPE The type of an <ATTACK_WINGED_AIRCRAFT>. ENUMERATION   138
AUXILIARY_VESSEL_TYPE The type of a <WATER_SURFACE_VESSEL> designed for auxiliary operations. ENUMERATION   139
AVAILABLE_FACILITIES_TYPE The type of <FACILITY>s available at, or in the near vicinity of, a <HARBOUR> or marina. ENUMERATION   140
AVERAGING_PERIOD The <<TIME_QUANTITY>> over which a measurement has been averaged; the averaging period. REAL TIME 141
AVERAGING_PERIOD_CATEGORY A category describing the <<AVERAGING_PERIOD>>. ENUMERATION   142
AVIATION_LOCATION_ID_VALUE_SET The value set of a formatted <<AVIATION_LOCATION_IDENTIFIER>>. ENUMERATION   143
AVIATION_LOCATION_IDENTIFIER An identifier of an aviation <LOCATION>. The format and values of the identifier are specified by an <<AVIATION_LOCATION_ID_VALUE_SET>>. CONSTRAINED_STRING   144

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