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