皇冠体育app

Boeing 757-28A, G-STRY

Summary:

皇冠体育app aircraft was in the cruise at FL370 when the flight crew noticed an increase in both engine vibration levels. 皇冠体育appy selected the Engine Anti-Icing (EAI) ON but the vibration levels continued to increase gradually. 皇冠体育app crew decided to carry out an ice shedding procedure, which was described in their operations manual (OM). As thrust was reduced on the left engine its vibration increased rapidly to the maximum level shown on the EICAS. 皇冠体育app crew attempted to restore the thrust but the engine did not respond normally to the thrust lever movement. A descent was made to a lower level and a diversion to Nouakchott was initiated. 皇冠体育app engine recovered at some time during the descent and a normal two engine approach and landing was made. 皇冠体育app left engine is considered to have entered a surge or stall condition following the action of retarding the thrust lever and then increasing thrust. 皇冠体育appre was no damage evident within the engine and the vibration condition was attributed by the engine manufacturer to an asymmetric ice build up under the spinner fairing. 皇冠体育app manufacturer鈥檚 Fan Ice Removal procedure as described in the OM was found to be inappropriate for the prevailing conditions. Three Safety Recommendations are made.

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