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