The Shetland helicopter crash will be "painstakingly investigated", a senior executive has promised...lights by all Super Puma models to and from UK installations [are suspended]. The crash...killed three men and a woman...[CHC] said: "We are fully supporting...the investigation into the incident and will continue to give our full co-operation to this process. We have been keeping our customers informed and working with them to see how we can meet their needs...Oil and Gas UK said: "Our primary concern is assuring the safety of the workforce. The Helicopter Safety Steering Group...recommended that flights...of Super Puma helicopter should only resume when sufficient factual information to support this decision becomes available...Super Puma manufacturer, Eurocopter, thanked those involved in the search and rescue operations for "prompt action" which had "saved many lives"...The Unite union...called on the Scottish parliament to hold an emergency debate on offshore safety...[refers to Bond and Bristow]