FAA has issued a special airworthiness information bulletin (SAIB) for the Robinson R44 II, warning operators of potential fuel vapor forming in high temperatures. The bulletin follows a power loss in a new R44 II during its ferry flight from the factory. The incident took place in ambient temperature conditions around 100 degrees F. The agency is recommending R44 II operators monitor fuel system vapor in hot temperatures by checking the auxiliary fuel pump warning light. If vapors begin to form, FAA advises lowering altitude or suspending operations until temperatures go down.
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