Aviation Dictionary
اعداد و اختصارات و نوشته هایی که برای شناسائی وضعیت قطعات از لحاظ ابعاد و مشخصات دیگر روی نقشه نشان داده میشوند
Numbers and names used to identify components or parts in an aircraft drawing. call-outs are normally placed near the part being identified and are connected to the part by a thin leader line.