After full flap was selected on late final approach, the pilot heard a loud thud, the aircraft pitched nose up and the flaps retracted rapidly. A go around was conducted while the pilot established that the aircraft operated normally, apart from the flaps. A flapless landing was carried out.
Examination of the flap system revealed a failure on the idler gear of the flap drive gearbox. The gearbox had been in service for 12,546 hours, since the aircraft was manufactured. The manufacturer had not specified any inspection schedules, the gearbox being required "on condition".
|Date:||06 February 1998||Investigation status:||Completed|
|State:||Northern Territory||Occurrence type:||Flight control systems|
|Release date:||29 October 2002||Occurrence class:||Technical|
|Report status:||Final||Occurrence category:||Incident|
|Highest injury level:||None|
|Aircraft manufacturer||Cessna Aircraft Company|
|Type of operation||Air Transport Low Capacity|
|Damage to aircraft||Nil|
|Departure point||Garden Point, NT|
|Role||Class of licence||Hours on type||Hours total|