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