Why are they hanging by crane. Could sway during windy conditions. Should have a more stable way of lifting it. If a proper risk assessments is done then there is lot scenario for this system to fail.
Check their interview in PT prime and Federal where they say the crane can handle upto 90 tonnes but even with people fully occupied in seats, the operating weight in air is only 9 tonnes. They say they won't operate at unsupported wind speeds and weather conditions.
