Taiwan’s AH-64E Apache attack helicopters have been grounded for inspections following a US technical notification about gearbox risks, Minister of National Defense Wellington Koo (顧立雄) said yesterday.Speaking briefly to reporters before a legislative committee hearing, Koo said the army would deplo. Add TT as Preferred Source Taiwan’s AH-64E Apache attack helicopters have been grounded for inspections following a US technical notification about gearbox risks, Minister of National Defense Wellington Koo (顧立雄) said.