'Orkan' (iv) was a U-boat wolfpack operation in the Norwegian Sea (5/10 March 1944).

The wolfpack comprised U-288, U-366, U-674 and U-990, and for the loss of Oberleutnant Bruno Langenberg’s U-366, which fell victim to a rocket attack by a Fairey Swordfish anti-submarine aeroplane of the Fleet Air Arm’s No. 816 Squadron from the escort carrier Chaser, sank no ship.