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