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