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Two Q's re how airliners deal w/ no taxiway to the runway...

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...and also, when the taxiway takes the airliner into the runway pre-threshold often quite a long ways back from the threshold.  For Q1, are they expected to taxi on the runway near the centerline or where is the expectation when there is no taxiway to the runway threshold?  Presumably runway lights are on as well as strobe?   For Q2, will the airliner start well before the threshold to get more effective runway, or is the expectation to not start accelerating until they get to the threshold?

Thanks

Noel

System:  9900X3D Noctua NH-D15 G2, MSI Pro 650-P WiFi, G.SKILL  64GB (2 x 32GB) 288-Pin PC RAM DDR5 6000, WD NVMe 2Tb x 1, Sabrent NVMe 2Tb x 1, RTX 4090 FE, Corsair RM1000W PSU, Win11 Home, LG Ultra Curved Gsync Ultimate 3440x1440, Phanteks Enthoo Pro Case, TCA Boeing Edition Yoke & TQ, Cessna Trim Wheel, RTSS Framerate Limiter w/ Front Edge Sync.

Aircraft used in MSFS 2024:  Fenix A320,  Aerosoft CRJ, FBW, WT 787X, I-Fly 737 MAX 8, Citation Longitude.

 

1 - Most airliners will backtrack on the runway to get to the threshold, then make a 180 degree turn before beginning the takeoff roll. Standard airline procedures for being on a runway will apply (stay on the centerline, all lights on, etc) 

Smaller aircraft which don't need the entire runway (turbo props etc) will either depart from a taxiway intersection, or only backtrack part-way. This will usually only be if their airline SOP allows intersection takeoffs. 

Take a look at Grenada (TGPY) or St Vincent (TVSA) ops (on YouTube) for good examples of this. 

 

2 - If there is a displaced threshold, aircraft can begin their takeoff roll before the threshold (displaced thresholds only restrict landing aircraft.... they must land beyond the threshold, usually for obstacle clearance reasons). See runway 22R at KJFK for a good example of this.

 

Hope this helps, 

DB

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