Matching Pairs AVIATION ABBREVIATIONSOnline version Match the abbreviation with the correct meaning. by Steven Rafael Torres Orozco 1 P/N 2 AD 3 P.S.I 4 S/N 5 SB 6 SL 7 LB 8 SRM 9 FT PART NUMBER SERVICE BULLETIN SERIAL NUMBER AIRWORTHINESS DIRECTIVE FOOT SERVICE LETTER PRESSURE SQUARE INCH POUND STRUCTURAL REPAIR MANUAL