CPDLC Performance

Monitoring at an ANSP level is based on a monthly analysis of FANS1/A data. For CPDLC we measure ACTP, ACP, and Crew Response for all sent uplink messages that receive both MAS and a WILCO response. The overall aim of our analysis to date has been to determine the actual performance of aircraft against the SPR standard and to detect any variations from the standard to enable corrective actions to be initiated. This reflects the ISPACG culture of continuous performance improvement.

Currently, we are monitoring on a monthly basis individual airline fleet performance. SATCOM performance is of main interest as pure VHF performance is well within the requirements. Performance analysis can be done for any media type and for all media combined. A typical CPDLC ACTP analysis for a particular aircraft company and type is illustrated below.  These graphs provide a clear visual display of month to month performance and aggregated performance.

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Typical monthly ACTP analysis for an airline type pairing in 2008

These monthly results are then consolidated into a year to date aggregate for each airline and aircraft type pairing and can be done for any type of transmission media or combination. Where deviations are detected from the normal expected performance for a particular aircraft type further analysis may be completed for each aircraft tail in a particular fleet in order to determine if one aircraft is responsible for the degraded fleet performance.