Simmod PRO! - Case Study

Simmod Pro at SFIA

San Francisco International Airport (SFIA) – Hold PAD between Runways 01L and 01R

In order to improve departure queue sequencing and reduce taxiway congestion at SFIA, a hold pad was proposed between Runways 01L and 01R.  During periods of high departure demand, the hold pad could be used to move aircraft off of Taxiways A and B to ease congestion as well as to sequence aircraft to the two runways.  In order to accurately load the departure queue hold pad, the simulation model needed to dynamically route taxiing aircraft on to the various taxiways.

Simmod PRO! Solution

Several levels of ground simulation logic needed to be implemented to insure that operations were being modeled accurately.  Rules devised to control the ground movement and sequencing of aircraft such as: 

When should departures use the hold pad when departing Runway 01L?

For aircraft traveling south along Taxiway A or B:  As departure aircraft approach the departure end of  Runway 01L along Taxiway B, they must first check to see if there is an aircraft queued along Taxiway M. If there is an aircraft queued at this position, they then check the next position, and if that position is also filled, they finally check the taxiway to the new hold pad.  If the hold pad has three aircraft holding between the runways, then the departure aircraft will wait along Taxiway B and reevaluate the situation once it changes.

For aircraft traveling north along Taxiway A or B:  As departure aircraft approach the departure end of  Runway 01L along Taxiway B, they must first check to see if there is an aircraft queued at the second position. If that position is filled, the aircraft then checks the taxiway to the new hold pad.  If the second position is filled and the hold pad has three aircraft between the runways and one holding, then the departure aircraft will wait along Taxiway B and reevaluate the situation once it changes.

 

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