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