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