Speaking at the inquest, held at Westminster Coroners Court on Wednesday, Health and Safety Executive officer Michelle Workemen said: "After the incident, and after perusal of all the documentation, I could not find evidence that Tangney had the necessary certification to work as a banksman."
Although documentation to act as a banksman is not a legal requirement, the HSE said it expected workers to have it.
Andrew Webb, a steel fixer from south Devon who was working on the site for subcontractor JJ Fitzgerald, witnessed the accident while he was on tea break.
Webb said: "I saw the shutter lighting on the crane, and I saw Jack below on the radio. I heard a crash and saw the shutter swinging on the chain. I shouted to Jack – he had seen it and was running back towards the hoarding. The shutter came down at an angle and I saw Jack go underneath the shutter, which had hit him."
Tangney was described by colleagues at the inquest as "kind and competent" and "took safety as a priority".
The cause of death was given as multiple injuries of which the most significant was to the left side of the head. The court returned a verdict of accidental death.