|C2/2006L Incident at Oulu airport 9 February 2006||Text version|
On Thursday February 9th 2006 at 08:37 Finnish time an incident occurred at Oulu airport in which the runway safety margins became smaller than allowed about 660 meters from the threshold of runway 30 at the arrestor cable. A general aviation category airplane OH-KJJ (TB 20), departing from Oulu to Helsinki, passed at an altitude of 150 to 400 feet over a tractor on the runway.
The tractor in use by Air Force was cleaning the arrestor cable apparatus when Air Traffic Control gave a clearance for take off for the aircraft taking off from runway 12. The driver of the tractor was at this time outside the tractor cleaning the arrestor cable area at the runway periphery. The Air Traffic Controller noticed the occurrence immediately when the aircraft was in the air by the tractor.
The safety margin applicable at the runway was not followed, but the performance of the light aircraft was so good that no clear situation of danger arose.
The cause of the incident was the controller’s mistake. He forgot to secure that the runway was clear of obstacles over its entire length when he gave a clearance for take off for the departing aircraft. Contributing factors were substantial traffic of land vehicles and on the radio due to the morning snow fall and the fact that the controller’s work shift was the first operative work shift after a long training period.
The accident investigation commission presents following safety recommendations: