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