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One year on: Results of Time Based Separation at LHR
Andy ShandGeneral Manager of Customer Affairs
Kevin HightowerAviation Chief Technologist
The Need for Time Based Separation
Runway Throughput Benefits (May – July)• Across all wind conditions
– Saving is 78NM per day– Increase of 20 movements per day
• In strong wind conditions– Saving is 178NM per day – Increase of 49 movements per day
Wind Conditions
Extra Movements17-hour
scheduled period
Per Hour
All AWE 20 1.2Strong AWE
(>20kts) 49 2.9
Wind related ATFM delay reduced by 62%
November ResultsEstimate over 25,000 minutes of delay saved in November versus
distance based separation
15 days of strong headwinds
Nov 10th: Zero minutes ATFM delay with 40 knot Headwinds
5nm becomes 3.7nm in 60 knot headwind
Summary of Findings
Reduced cancellations
No Increase in Go Arounds or Wake Turbulence Encounters
62%reduction in ATFM
wind delay
178NM of spacing saved per day
in strong wind conditions (>20kts)
+2.9 movements per hour in strong wind conditions
83% of aircraft experienced smaller Arrival-Arrival
separations
78NM of spacing on approach
saved per day, on average
+1.2 movements per hour across all wind conditions
No pilot inquires or comments
Intelligent Approach Roadmap