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TAIPEI (AFP) - Two Taiwanese pilots were injured on Friday when their Apache attack helicopter crash landed on a building in northern Taiwan during a routine training mission, the military said.

The pilots were sent to a military hospital for treatment to slight injuries after crashing on top of the three-storey building in Taoyuan county but no civilians were hurt, a military official said.

Television footage showed uniformed men inspecting the wreckage of the chopper on top of the building, which was also partly damaged by the impact.

"The incident happened during basic flight training for unknown reasons and a special team is investigating the cause," an official told reporters.

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In mid-December a planetary nut came loose in a transmission, said David Koopersmith, Boeing vice president Attack Helicopter programs, at a company breakfast for the media Jan. 16. The fix ensures that the nut – what officials are calling a threaded component in the transmission – will “never come loose again.” That transmission fix also went through dynamic and static testing before heading out to units.

This is not the first time the new Apache variant faced with a transmission issue. Earlier, the Boeing’s transmission supplier Northstar Aerospace had financial issues – since resolved – that delayed manufacturing of some transmissions.

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