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