Air ambulance crews feared "100 casualties and up to 20 fatalities" in the crash, it has emerged.
The charity in East Anglia says any supply issues could endanger patients.
A report finds an unidentified plane flew close to a medical helicopter over Hertfordshire.
A Peterborough man recounts how air ambulance paramedics saved his life after a brain haemorrhage.
The helicopter charity gets permission for its new location, but now the fundraising begins.
The charity says it treated fewer patients year-on-year, but still needed financial support.
The charity is seeking planning permission to create a purpose-built air base just outside the city.
Keith Taylor recalls how the East Anglian Air Ambulance saved him after his motorcycle crash.
The charity says mechanics are working really hard to fix the issue and get the helicopter working.
