What was found
DURING THE 48-MONTH CORROSION INSPECTION, THE MAIN LANDING GEAR ASSEMBLIES WERE FOUND TO BE SEVERELY CORRODED. THE LEFT MAIN LANDING GEAR, P/N 1159L40001-17, S/N T8958, TSN: 12535.5, CSN: 6593, TSO: 2633.3 AND CSO: 1607 WAS REMOVED AND REPLACED WITH OVERHAULED P/N 1159L40001-101, S/N T0205. THE RIGHT MAIN LANDING GEAR, P/N 1159L40001-18, S/N T9040, TSN: 12535.5, CSN: 6593, TSO: 2633.3 AND CSO: 1607 WAS REMOVED AND REPLACED WITH OVERHAULED P/N 1159L40001-201, S/N T0204, IN ACCORDANCE WITH GULFSTREAM G-IV AMM 32-01-00, REVISION 78. AN OPERATIONAL CHECK WAS PERFORMED AND FOUND SATISFACTORY.