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