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