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