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