Serious incident to the ATR 42-500 registered F-GPYF operated by HOP! on 25/03/2018 at beginning of descent to Aurillac airport
At the start of the descent, the left main landing gear door detached from the plane, causing further damage to the aircraft. The loss of a nut is the cause of this in-flight separation. The safety investigation brought to light errors in the manufacturer's generic maintenance documentation that may lead to the installation of screw / nut combinations which do not correspond to the state-of-the-art.