Class - FASDataBlock

<< object >> Logical View.AIXM.AIXM Features.Procedure.Approach Procedure.3 - Segment Leg
<<object>> Final Approach Segment Data Block. The additional information about the Precision Final Segment. Most attributes describe the LPV path point record required for WAAS procedures.

List of attributes

Name Data Type Definition    
horizontalAlarmLimit ValAlarmLimitType (ARINC) Horizontal Alert Limit (HAL) is the radius of a circle in the horizontal plane (the local plane tangent to the WGS-84 ellipsoid), with its centre being at the true position, which describes the region which is required to contain the indicated horizontal position with the required probability for a particular navigation mode assuming the probability of a GPS satellite integrity failure being included in the position solution is less than or equal to E-4 per hour.    
verticalAlarmLimit ValAlarmLimitType (ARINC) Vertical Alert Limit (VAL) is half the length of a segment on the vertical axis (perpendicular to the horizontal plane of WGS-84 ellipsoid), with its centre being at the true position, which describes the region which is required to contain the indicated vertical position with a probability of 1-E-7 per approach, assuming the probability of a GPS satellite integrity failure being included in the position solution is less than or equal to E-4 per hour.    
thresholdCourseWidth ValDistanceType The width of the lateral course at the Landing Threshold Point (LTP). This width, in conjunction with the location of the Flight Path Alignment Point (FPAP) defines the sensitivity of the lateral deviations throughout the approach.    
lengthOffset ValDistanceType Distance from the stop end of the runway to the Flight Path Alignment Point    
CRCRemainder ValHexType Hexadecimal representation of the 32-bit CRC used to check the integrity of the FAS data block.    
operationType NoSequenceType Operation Type. A number from 0 to 15 that indicates the type of the final approach segment.    
serviceProviderSBAS NoSequenceType SBAS Service Provider Identifier. A number from 0 to 15 that associates the approach procedure to a particular satellite based approach system service provider.    
approachPerformanceDesignator NoSequenceType Approach Performance Designator. A number from 0 to 7 that identifies the type of approach.    
routeIndicator AlphaType Route Indicator. A single alpha character (A through Z or blank, omitting I and O) used to differentiate between multiple final approach segments to the same runway or heliport.    
referencePathDataSelector NoSequenceType Reference Path Data Selector (RPDS). A number (0-48) that enables automatic tuning of a procedure by LAAS avionics.    
referencePathIdentifier AlphanumericType Reference Path Identifier. A four-character identifier that is used to confirm selection of the correct approach procedure.    
codeICAO AlphanumericType The first two designators of the ICAO location identifier, as identified in ICAO Doc 7910.    

Navigable associations to FASDataBlock

From Association Multiplicity Role To Role description
FinalLeg has 0..1 FASData Data used in the CRC calculation of the FMS box to insure the final segment of an approach procedure has not been modified.