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