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- practice had been complied with.
- A mechanical adjustment made immediately prior to departure, to correct lowered oil pressure on one engine, was without significance with respect to the accident.
- The flight was dispatched in accordance with normal procedure, and all information in the possession of the Weather Bureau and the company meteorologists had been taken into account in connection with the dispatch.
- The weather forecast contained nothing which would normally have raised any question about the advisability of dispatching a regular airline operation.
- The weather forecast was made in as much detail as the present state of meteorological knowledge permits, and proved to have been substantially accurate except for the omission of any reference to extraordinarily heavy rainfall.
- Immediately prior to the accident the airplane was proceeding on its normal course, and at normal altitude, in accordance with the flight plan.
- The airplane began its descent in the immediate neighborhood of, and immediately after, an intense flash of lightning.
- There were several other lightning flashes within a distance of two or three miles, and within a short space of time before and after the accident.
- The thunderstorm was accompanied, or immediately followed, by rainfall of extraordinary intensity, the heaviest known in the neighborhood
