On 30 April 1977 one helicopter disappeared off the coast of Sola. A replacement helicopter was delivered in January 1978. Three helicopters participated in the most extensive operation following the sinking of "Alexander L. Kielland" on 27 March 1980. On 22 April 1982 another helicopter crashed, this time without fatalities, when hitting a power line in Sirdal. Another such incident occurred on 10 November 1986 near Bodø, this time with one fatality. In 1988 another helicopter crashed at Tyinvann in 1988, without fatalities and with the aircraft being repaired. During the late 1980s the helicopters were often grounded due to lack of spare parts, which on 6 July 1988 hindered the unit form participating in aiding the sinking "Piper Alpha" oil platform.