From the data given by Mr. Nicolai, we estimate the global duration of the sighting to be between 30 and 40 seconds. It is noteworthy that the witness was in good observing conditions throughout the event. His position on the higher lever, behind the pump shelter or behind the cabin provided a fairly open vision field of more than 90 degrees, with only three trees as obstacles.

Distance.If we consider the beginning of the approach phase until impact, the estimated distance may be about 20 m. The distance between the pump

Fig. 8. Landing site: the platform and location of the trace