A major jet engine maker says it will investigate the effects of volcanic ash on the engines of aircraft that have flown through the plume in the last few weeks.
Honeywell Aerospace's engines powered several of the planes used to collect scientific data after the eruption of the volcano in southern Iceland in April and May.
The planes, which flew through the clouds for hours, were operated by Germany's national aeronautics research center DLR and the British weather service.
Honeywell said Thursday its engines have been returned to Phoenix, Arizona, for analysis and evaluation.
Ronald J. Rich, vice president of Honeywell's propulsion systems, says the probe "will help define operational impact to the engine and any damage to components."