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