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