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