Petroleum Helicopters operated Aerospatiale SA330J Pumas between the late 1970s and 1988 servicing offshore drilling rigs in the USA. N3601U was photographed at PHI's Morgan City heliport on the shore of Lake Palourde, which was known as the world's largest heliport when PHI opened it in 1969. After flying in Ecuador as HC-BPD in the late 1980s, PHI sold it to Air Zermatt where it became HB-XUB in June 1989. It was written off on Sep. 11, 1989 when it crashed after both engines failed while lifting an external load near Blauherd. PHI lost four of its Pumas in fatal accidents in 1978-1988.