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