My attempt - only subtly different
1. The pilot escaped unharmed from the accident
2. The pilot interpreted these signs as being due to the failure of the engine
and retracted the flaps, increasing the attitude of the nose "above the
aircraft."
3. It was not possible to determine the cause of the extinguishing of the
landing lights, nor was any damage to the engine detected or to the
indications of its operation, it was confirmed that the engine was still
working after the landing. It is accepted that the likely cause was an
inadvertent action by the pilot, under the effect of fatigue caused by the
long duration of the flight and the late hour of the day.
Not good English but that is a pretty literal translation - it is actually not very good Portuguese either!