Armed with an air gun, Huseby threatened a cabin attendant and told the captain to proceed as planned to Fornebu.

After one hour, Huseby released 70 hostages in exchange for having the aircraft moved closer to the terminal building.

[1][2] The day before the hijacking, Huseby graduated from upper secondary school, where he studied health and social work.

The weapon was in his hand luggage when boarding the aircraft at Trondheim Airport, Værnes, where there was no security control.

While airborne, the hijacker showed a female flight attendant the air gun and asked her to inform the captain that he wanted control over the aircraft, but that otherwise all was to proceed as planned.

[3] The hijacker informed the passengers and crew falsely that he had placed explosives in the toilet rooms, but that no one would be hurt if they cooperated.

He had previously been sentenced five times for violent offenses, including an armed robbery of a taxi and threatening a lensmann with a shotgun.

[9] He lost his job as a seaman due to drunkenness, and was put into a psychiatric institution in 1980, aged 19.

In 1983, he was admitted to a Christian school, and had managed to stay away from alcohol for two years, but had started again just prior to the incident.

[8] During the court case, Huseby stated that he wanted help from society and attention drawn to his cause.

Huseby stated that the hijacking was spontaneous and that he planned to make an armed robbery or take hostages at the Radisson SAS hotel in Oslo.

[8] His defence lawyer argued that Huseby did not commit a hijacking in the letter of the law, but had instead taken hostages, which would result in a lesser sentence.

They considered him to have a very underdeveloped ability to make rational decisions and weak mental health.