Safety recommendation SL no. 2019/01T

On 21 June 2018 OH-HNX, a helicopter from Heliwest hit a crossing power line and cut all three conductors. The risk of collision with crossing lines is very real in connection with helicopter work at low altitude along power lines. This is e.g. illustrated by the fact that, over a six-month period, Agder Energi Nett had three incidents in connection with work along the company's power distribution network. Sweden and Finland have introduced requirements for physical marking of power lines before they are crossed by overhead cables. The AIBN believes such marking could, to a substantial degree, prevent the risk of collision.

The Accident Investigations Board Norway recommends that the Civil Aviation Authority introduce requirements for physical marking of crossing lines in Norway.

Safety recommendation SL no 2019/02T

On Wednesday 14 November 2018, the main rotor of LN-OAN struck the spire on a mast in connection with a nearby mast being dismantled and transported away. This resulted in damage to the rotor blades and subsequent emergency landing. The incident would probably have been avoided if the safety margin between the helicopter and the obstacle had been greater. The safe job analysis did not reveal that the "longline" was too short to provide the necessary safety distance.

The Accident Investigation Board Norway recommends that the Civil Aviation Authority, as head of the Aviation Safety Forum for operators of inland helicopters, ensure that the forum continues the effort to improve the operators' methods for risk assessment of operations in general, and the associated safe job analysis for each job in particular. This can increase the likelihood that all aspects of the relevant hazards are identified, including distance to obstacles, and that the outcome is effective.

Safety recommendation SL no 2019/03T

On Wednesday 14 November 2018, the main rotor of LN-OAN struck the spire on a mast in connection with a nearby mast being dismantled and transported away. This resulted in damage to the rotor blades and subsequent emergency landing. The incident would probably have been avoided if the safety margin between the helicopter and the obstacle had been greater. The safe job analysis did not reveal that the "longline" was too short to provide the necessary safety distance. In particular, it is important that the safe job analysis reflect different challenges associated with the relevant mission, and thus used as a safety net and active barrier to adverse events.

The Accident Investigation Board Norway recommends that the Civil Aviation Authority, in its supervisory work, evaluate the safe job analysis to verify that these are adequate for the relevant missions.