Boeing is warning airlines flying the 737 outfitted with next generation engines that there could be trouble on takeoff, the Seattle Times reports.
The safety bulletin highlights flights operating up and down the West Coast, many from Sea-Tac.
Boeing confirmed to KING 5 that during the critical stage of climbing to cruise altitude, some engines on the next generation 737s have had a sudden, uncontrolled surge of power that last up to 10 seconds before returning to normal.
Boeing said in a statement that 32 events have taken place. The Times says of those 32 reported incidents, 17 involved Alaska Airlines. Some pilots decided to abort their flights and return to the airport.
Boeing says the events are rare and brief, and the level of over-speed is well within the demonstrated capability of the engine.
Boeing says if one of these episodes happens, the plane is not flown again until the engine is inspected and the fuel control unit replaced.
The Times says Boeing believes there may be an issue with the fuel supply.
The company says they are working with operators, the engine manufacturer and entities in the fuel supply chain to identify the cause and resolve the issue.