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The aircraft on its own
Basic empty weight is the standard empty weight — airframe, engine, unusable fuel and full operating fluids including full engine oil — plus the optional equipment installed in this particular aircraft (PHAK Ch. 10).
This aircraft’s record: 1,665 lb at an empty-weight CG of 38.2 in. It includes: airframe, engine, standard and optional equipment, unusable fuel and full engine oil.