CASA warning for Robinson operators OPERATORS of Robinson R44 helicopters who have yet to modify all-aluminium fuel tanks have been warned not to fly their aircraft. Responses to the the Civil Aviation Safety Authority's request for status upgrades continue to trickle in. As of yesterday morning, 301 helicopters had been modified, with operators reporting work was continuing on 17. However, the regulator still had to hear from operators of 167 helicopters. "Any R44 flown without the flexible fuel tanks will be in breach of an airworthiness directive issued this week," CASA spokesman Peter Gibson said. Operators are required to inform CASA of the status of their helicopter in relation to fuel tanks. Any operators who have not yet done so are urged to contact CASA as soon as possible.