Analysis of information sources in references of the Wikipedia article "Πτήση ΟΑ 411 της 9ης Αυγούστου 1978" in Greek language version.
no malfunction in airframe or engines caused the lack of performance following takeoff. Instead, the problem was caused by the inadvertent shut off of the water injection pumps by the flight crew and the resulting decrease in thrust. Loss of wet thrust in a situation where the airplane was takeoff climb limited severely reduced the ability to continue the flight with any significant amount of positive climb gradient. Once thrust was manually increased at a coordination time of approximately 325 seconds, the airplane climbed out in a normal manner.