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The flight Sim is littered with these "Holes in the ground" Airfields....
We all encounter them at different times. Generally a fault in the Scenery Mesh calculations...
Often occurs due to a clash between the Default Mesh, and add-on Mesh.
Sometimes the Airfield appears on top of a plateau above the surrounding ground...

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Either way...we just have to put up with it...makes things interesting!....

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Paul...G-BPLF...FS 2004..FS Navigator... 8-)...!
The only way to get out of the "Hole" is to (Y) Slew...and (Q) lift...

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A fiddle, but it works...

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Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.