NDB [Non-directional radio beacon [NDB]]
(ICAO) A Non-directional radio beacon. A low or medium frequency radio beacon which transmits signals whereby the pilot of an aircraft properly equipped can determine bearings and 'home in' on the station.
Attributes
CODE_ID [Identification] mandatory
The coded identification of the NDB.
Rules:
  1. If CODE_CLASS = 'B' [en-route NDB], then CODE_ID shall not be duplicated within 600 NM of the location of the NDB..
Domain: CODE_ID_NAV_AID
GEO_LAT [Latitude] mandatory
The latitude of the position of the NDB.
Domain: GEO_LAT
GEO_LONG [Longitude] mandatory
The longitude of the position of the NDB.
Domain: GEO_LONG
TXT_NAME [Name] optional
The full textual name of the radio navigation aid.
Domain: TXT_NAME
VAL_FREQ [Frequency] mandatory
The frequency of the NDB emission.
Rules:
  1. The value of the VAL_FREQ must be in the interval 190 to 1750 kHz. (see ICAO Annex 10, Vol. 1, section 3.4.4.1).
Domain: VAL_FREQ
UOM_FREQ [Unit of measurement [frequency]] mandatory
The unit of measurement of the Non-Directional Beacon emission frequency.
Domain: UOM_FREQ
CODE_CLASS [Classification] optional
The class of the NDB.
For example, NDB or Locator.
Domain: CODE_CLASS_NDB
CODE_PSN_ILS [Position] optional
A code indicating the position in a real or virtual ILS for Locators (low powered NDBs) situated at an aerodrome.
For example, LO = Locator outer, LM = Locator middle.
Rules:
  1. The value 'I' (inner marker position) is not allowed for NDB (CODE_CLASS = 'B').
Domain: CODE_PSN_ILS
VAL_MAG_VAR [Magnetic Variation] optional
The local angular difference between the True North and the Magnetic North.
Domain: VAL_ANGLE_MAG_VAR
DATE_MAG_VAR [Magnetic variation date] optional
The year when the magnetic variation was measured.
Domain: DATE_YEAR
CODE_EM [Emission] optional
A code indicating the type of emission, as defined at the 1979 ITU World Administrative Radio Conference.
For example, A3E, NONA2a, G1D, etc..
Domain: CODE_EM_RDO
CODE_DATUM [Datum] mandatory
A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
Rules:
  1. All geographical coordinates should be expressed in the WGS 84 system.
Domain: CODE_DATUM
VAL_GEO_ACCURACY [Geographical accuracy] optional
The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
Rules:
  1. If VAL_GEO_ACCURACY is specified, then UOM_GEO_ACCURACY is mandatory.
Domain: VAL_DIST_HORZ
UOM_GEO_ACCURACY [Unit of measurement [geographical accuracy]] optional
The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
Domain: UOM_DIST_HORZ
VAL_ELEV [Elevation] optional
The vertical distance of the position from Mean Sea Level. The geoidal height of the position.
Rules:
  1. If VAL_ELEV is specified, then UOM_DIST_VER is mandatory.
Domain: VAL_DIST_VER
VAL_ELEV_ACCURACY [Elevation accuracy] optional
The vertical distance from the stated elevation within which there is a defined confidence of the true position falling.
Rules:
  1. VAL_ELEV_ACCURACY may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
VAL_GEOID_UNDULATION [Geoid undulation] optional
A distance separating the geoid and the ellipsoid at that position. In respect of WGS-84 geodetic datum, the difference between the WGS-84 ellipsoidal height and geoidal height represents geoidal undulation.
Rules:
  1. VAL_GEOID_UNDULATION may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
UOM_DIST_VER [Unit of measurement [vertical distance]] optional
The unit of measurement for vertical distances: elevation, geoidal undulation.
Domain: UOM_ELEV
VAL_CRC [Cyclic redundancy check] optional
Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
Notes:
Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
Domain: VAL_HEX
TXT_VER_DATUM [Vertical Datum] optional
Attribute to take the "Vertical Datum" (viz. the tide gauge to determine MSL - for example, "AMSTERDAM GAUGE", "NEWLYN" etc.).
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK
NDB_USAGE_LIMIT [NDB usage limitation]
All limitations of the same type (such as, coverage, usability, out of tolerance, etc.) of an NDB, described using circular sector volumes.
Attributes
CODE_TYPE [Limitation type] mandatory
A code indicating the type of radio navigation aid limitation.
Rules:
  1. If CODE_TYPE='CVR' ('coverage'), then VAL_DIST_OUTER is mandatory.
  2. If CODE_TYPE='SCL' ('scalloping'), then VAL_ANGLE_SCALLOP is mandatory.
Domain: CODE_TYPE_NAV_AID_LIMIT
TXT_RMK [Remark] optional
Domain: TXT_RMK
NITROGEN [NITROGEN supplies]
NITROGEN supplies in aviation.
Attributes
CODE_TYPE [Type] optional
The type of nitrogen supplies for aviation usage.
Domain: CODE_TYPE_NITROGEN
TXT_RMK [Remarks] optional
Remarks with regard to the nitrogen supplies.
Domain: TXT_RMK
OBSTACLE [Obstacle]
(ICAO) All fixed objects whether temporary or permanent, or parts thereof, that are located on an area intended for the surface movement of aircraft or that extend above a defined surface intended to protect aircraft in flight.
Attributes
TXT_NAME [Name] optional
The textual name or location of an obstacle.
Domain: TXT_NAME
TXT_DESCR_TYPE [Type] mandatory
A full textual description of the type of obstacle. For example, mast, chimney, antenna, etc. .
Domain: TXT_DESCR
CODE_GROUP [Group of obstacles] mandatory
A code indicating that the obstacle consists of a group of obstacles of the same type. For example, a group of trees, a group of buildings, a group of antennas, etc..
Domain: CODE_YES_NO
GEO_LAT [Latitude] mandatory
The latitude of the position of the obstacle.
Domain: GEO_LAT
GEO_LONG [Longitude] mandatory
The longitude of the position of the obstacle.
Domain: GEO_LONG
CODE_LGT [Lighted] mandatory
A code indicating that the obstacle is lighted.
Rules:
  1. If CODE_LGT ='Yes', then TXT_DESCR_LGT is mandatory.
  2. If CODE_LGT ='No', then TXT_DESCR_LGT cannot be specified.
Domain: CODE_YES_NO
TXT_DESCR_LGT [Type and colour of lighting] optional
A textual description of the type and colour of lighting for an obstacle.
Domain: TXT_DESCR
TXT_DESCR_MARKING [Visual marking] optional
A textual description of the visual markings for an obstacle.
Domain: TXT_DESCR
CODE_DATUM [Datum] mandatory
A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
Rules:
  1. All geographical coordinates should be expressed in the WGS 84 system.
Domain: CODE_DATUM
VAL_GEO_ACCURACY [Geographical accuracy] optional
The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
Rules:
  1. If VAL_GEO_ACCURACY is specified, then UOM_GEO_ACCURACY is mandatory.
Domain: VAL_DIST_HORZ
UOM_GEO_ACCURACY [Unit of measurement [geographical accuracy]] optional
The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
Domain: UOM_DIST_HORZ
VAL_ELEV [Elevation] mandatory
The vertical distance of the position from Mean Sea Level, measured at the top of the obstacle. The geoidal height of the position.
Domain: VAL_DIST_VER
VAL_ELEV_ACCURACY [Elevation accuracy] optional
The vertical distance from the stated elevation within which there is a defined confidence of the true position falling.
Domain: VAL_DIST_VER
VAL_HGT [Height] optional
The value of the height of the obstacle above the ground surface.
Notes:
This attribute is likely to be specified mainly for artificial obstacles, which have a narrow base and are relatively tall compared to the surface occupied on the ground.
Domain: VAL_DIST_VER
VAL_GEOID_UNDULATION [Geoid undulation] optional
A distance separating the geoid and the ellipsoid at that position. In respect of WGS-84 geodetic datum, the difference between the WGS-84 ellipsoidal height and geoidal height represents geoidal undulation.
Domain: VAL_DIST_VER
UOM_DIST_VER [Unit of measurement [vertical distance]] mandatory
The unit of measurement for vertical distances: elevation, geoidal undulation.
Domain: UOM_ELEV
VAL_CRC [Cyclic redundancy check] optional
Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
Notes:
Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
Domain: VAL_HEX
TXT_VER_DATUM [Vertical Datum] optional
Attribute to take the "Vertical Datum" (viz. the tide gauge to determine MSL - for example, "AMSTERDAM GAUGE", "NEWLYN" etc.).
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK
OCA_OCH [Obstacle clearance altitude / height]
(ICAO) The lowest altitude or height above the elevation of the relevant runway threshold or aerodrome elevation as applicable, used in establishing compliance with appropriate obstacle clearance criteria.
Rules:
  1. At least one of the two values VAL_OCA or VAL_OCH must be specified.
Attributes
CODE_CAT_ACFT [Aircraft category] mandatory
A coded classification of aircraft based on 1.3 times stall speed in landing configuration at maximum certified landing mass. The default aircraft within these categories are considered to have a 2.5% climbing gradient capability. Additional allowable values for this attribute are given for aircraft with other climb capabilities.
Domain: CODE_CAT_ACFT
CODE_TYPE_APCH [Type of the approach procedure] mandatory
A code indicating the type of the approach procedure.
For example, straight-in, circling, straight-in CAT I, etc..
Domain: CODE_TYPE_APCH_PROC
VAL_OCA [OCA] optional
The value of the obstacle clearance altitude.
Rules:
  1. If VAL_OCA is specified, than UOM_DIST_VER is mandatory.
Domain: VAL_DIST_VER
VAL_OCH [OCH] optional
The value of the obstacle clearance height.
Rules:
  1. If VAL_OCH is specified, then CODE_REF_OCH is mandatory.
Domain: VAL_DIST_VER
CODE_REF_OCH [Reference for OCH] optional
The reference position for the obstacle clearance height(altitude).
Notes:
Obstacle clearance altitude is referenced to mean sea level and obstacle clearance height is referenced to the threshold elevation and in the case of non-precision approaches, to the aerodrome elevation or the threshold elevation if it is more than 2 m (7 ft) below the aerodrome elevation. An OCH for a circling approach is referenced to the aerodrome elevation.
Domain: CODE_REF_OCH
UOM_DIST_VER [Unit of measurement [vertical distance]] optional
The unit of measurement for the obstacle clearance altitude/height.
Domain: UOM_ELEV
TXT_RMK [Remark] optional
Domain: TXT_RMK
OIL [Oil]
Oil types used for aircraft/helicopters.
Attributes
CODE_CAT [Category] mandatory
A code indicating the category of oil available at an aerodrome/heliport.
Domain: CODE_CAT_OIL
TXT_DESCR [Description] optional
A textual description of the oil available.
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK
ORG_AUTH [Organisation or authority]
An entity used to model various Organisations and Authorities. For example: ATS Organisations, Aircraft Operating Agencies, States, Groups of States, etc.
Rules:
  1. For every organisation/authority having CODE_TYPE = 'O', 'IO', 'AOA', 'HA', 'A' or 'ATS', there must be at least one postal address and one telephone number defined.
Attributes
TXT_NAME [Name] mandatory
The full official name of the State, Organisaton, Authority, aircraft operating agency, handling agency etc. expressed in the Latin alphabet.
Domain: TXT_NAME
CODE_ID [Identification] optional
A code associated with the State/Organisation of States, (E.g. BE = Belgium, FR = France, UK = United Kingdom, ICAO = International Civil Aviation Organisation, etc..), authority or agency.
Domain: CODE_ID_ORG
CODE_TYPE [Type] mandatory
A code indicating the type of an Organisation/Authority.
E.g.: State, Association of States, International Organisation, etc..
Domain: CODE_TYPE_ORG
TXT_RMK [Remark] optional
Domain: TXT_RMK
ORG_AUTH_ASSOC [Organisation or authority - Association]
This entity type serves to realise the different 'two-way associations' (Bill of Material, explosion-implosion) which may exist between 'organisations/authorities' of the same and/or different types.
These associations could easily be represented as many-to-many relationships. Since there are, however, quite a number of 'operations' according to which the organisations/authorities concerned may be associated, this entity must take attributes necessary to control these operations.

Examples:
a) an organisation/authority/agency may consist of any number of other organisations/authorities/agencies;
b) an organisation/authority/agency may be contained within any number of other organisations/authorities/agencies;
c) an organisation/authority/agency may be the liaison between any number of other organisations/authorities/agencies;
d) an organisation/authority/agency may consist of any combination of the foregoing
Attributes
CODE_TYPE [Type] mandatory
The type of association between two ORGANISATION/AUTHORITY occurrences.
Domain: CODE_TYPE_ASSOC_ORG
TXT_RMK [Remark] optional
Domain: TXT_RMK
OXYGEN [Oxygen supplies]
Oxygen supplies used in aviation.
Attributes
CODE_TYPE [Type] mandatory
The type of oxygen supplies for aviation usage.
Domain: CODE_TYPE_OXYGEN
TXT_RMK [Remarks] optional
Remarks with regard to the oxygen supplies.
Domain: TXT_RMK
PASSENGER_FACILITY [Passenger facility]
Passenger facilities available at an aerodrome/heliport (like medical facilities) or in the surrounding area (hotels in city etc.).
Attributes
CODE_TYPE [Type] mandatory
A code indicating the type of passenger facility available.
For example, hotel, restaurant, transportation, medical service, etc.
Domain: CODE_TYPE_PAX_FAC
NO_SEQ [Sequence number] mandatory
A sequence number used to distinguish between many occurrences of the same type.
Domain: NO_SEQ
TXT_DESCR [Description] optional
A textual description of the passenger facility:
For example, airport buses every half hour, bank in the city, etc..
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK