NSN 0R-4730-017091524-B8, REF NR 5142T40G01, QTY 31 EA, DELIVERY FOB ORIGIN. The Government physically does not have in its possession sufficient, accurate, or legible data to purchase this part/contr... NSN 0R-4730-017091524-B8, REF NR 5142T40G01, QTY 31 EA, DELIVERY FOB ORIGIN. The Government physically does not have in its possession sufficient, accurate, or legible data to purchase this part/contract repair from other than the current source(s). THIS IS A CRITICAL APPLICATION ITEM (CAI).