Codeen:
Fuel System
The helicopter’s fuel tank group was drained and the contents were measured immediately after it was extracted from the building. It was found that the main fuel tank contained 76 kg of fuel, whilst the No 1 supply tank (left) contained 0.4 kg of fuel and the No 2 supply tank (right) was empty. It has also been confirmed, by examination and measurement of the internal design features, that this was the fuel disposition at the time of the accident. That is; fuel had not moved within the tank group whilst the helicopter was at rest in the building.
The whole matter of "witness reports" has to be taken with reservations, as most observers AT NIGHT will have difficulty in accurately describing a rapidly changing, and rapidly occurring, event.
Consider this: stalling rotor blades can also make a popping sound.
