B767 Undifferentiated or Other Model
Maintenance Airframe; Maintenance Powerplant
Training / Qualification
Aircraft Equipment Problem Critical; Ground Event / Encounter Other / Unknown
Aircraft Aircraft Damaged
Human Factors
I came into the station to turn Aircraft Y. [I was asked] to stay to get engine run training on Aircraft X. The aircraft had damaged blades from previous flight. [A team of three] mechanic removed and replaced 3 fan blades and 3 opposites for weight purposes and other blades were NDTed (Non-Destructive Testing) for damage.After the blade replacement; I was asked to train for engine run qualification. [Two of us] were being trained. We did an engine run for vibs (Vibrations) per the AMM (Airplane Maintenance Manual) test #6. We contacted tower and they contacted ground operation to put the aircraft in a location to perform a high power run. They pushed us into location; and ground operations was in front with communications with us and tower.The Vibes (Vibrations) for the fan were out of limits high: couldn't go above 76%. We then returned to the gate and [Trainer] called maintenance control. [Trainer] said that they instructed him to have [the team of three] to remove the spinner and run the engine again.We pushed back for more engine run training per the engine run maintenance check list card and AMM test #6; and [Trainer] was in the 1st observer seat and [another mechanic] was in the doorway; ground operations was in front of the aircraft in a car and all were in communications with tower. We ran both engines up and the vibes were lower than before; and closer to within limits. We taxied back to the gate and shut down. When we got out the mechanics on the ground informed us that when we started to go to full power they heard a noise. Ground operations or tower didn't inform us of this. We then looked at the engine and noticed the damage to the blades and cowling. Called maintenance control and informed them.The barrel nuts for holding the spinner on came out of their respective mounts and flew into the blades and engine acoustic creating the damage.
Maintenance reported that during a B767 engine run; the barrel nuts for holding the spinner on came out of their respective mounts and flew into the blades and engine cowl acoustic lining causing damage to the blades and lining.