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