The family of a British man killed in New Zealand's worst air disaster in 17 years have started an internet campaign warning people about our safety standards.

Chris Coker, whose 24-year-old son Bradley died in 2010 when a modified top-dressing plane was weighted to heavily at the back and failed to take off.

Coker, who has also written to Prime Minister John Key, has posted an emotional video on YouTube about the accident, which he describes as "avoidable and negligent".

Coker takes aim at laws in New Zealand surrounding personal injury and avoidable death.

He hopes the video will save lives by bringing attention to the "unknown dangers" in New Zealand, which is "unsafe".

Today, Transport Accident Investigation Commission (TAIC) investigator Ian McClelland criticsed the plane, which was too heavy and unbalanced when it took off.

He also acknowledged that the regulation of adventure aviation was not what it should be.

Prime Minister John Key told NZ Newswire that while Mr Coker's death was "very tragic", the vast majority of tourism operators were safe.