Επισκέπτης
While at 800 feet, a gear box in the helicopter failed, causing loss of tail rotor control. That put the helicopter in a spin and it fell 800 feet to the ground and crashed.
[size=15pt]The helicopter failed due to excessive vibration caused by inadequate lubrication in the gearbox and gearbox bearings and due to the failure of a device called an accelerometer that should have warned the pilots of the problem in the gearbox.[/size]
Έτσι ακριβώς.
Ακόμη και η απώλεια του LHM στο κιβώτιο μετάδοσης ισχύος μπορεί ν'αποφέρει απώλεια ουραίου στροφείου και πάπαλα..