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