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