Assertion: glider's lift | /r/CapableOf | begin around 2000 ft agl
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Source sentences:
text: OK, I’ve been watching for fields and looking for lift beginning around 2000 ft AGL, no lift found and still descending, by 1500 ft select two or three candidate fields, long enough, clear approaches, and fallow or low crops (still hoping for lift) and finally, around 1000 ft, pick the landing field, look for wires, poles, ditches, hazards to avoid, fly a pattern and land the glider.