The business case document is interesting, the rationales for the 'copter being many:
- the helicopter is funded through charitable donations, so not from existing budgets. Hopefully that includes fuel costs.
- it avoids the congestion of getting from Frenchay, Filton, or other parts of the city where helicopters can land.
- it makes it easier to bring in RTA and other critical casualties into A&E
- it makes it easier to do by-helicopter transfer between other hospitals
- all the other parts of the country have them.
What is interesting is the noise study, which shows that Kingsdown and nearby areas don't gain from having the air ambulance. Because although ambulances were noisy, they always came in the front of the BRI, along the main road. Now they will go over your house. As long as you sleep with the windows closed, it won't be "significantly" above the BS8233 noise level standards for noise levels that disturb your sleep.
People who live near the hospital come off worst, but according to the study that's OK, as there aren't that many. "It is therefore considered that the overall impact of the proposed Air Ambulance Service is small and therefore that planning permission should be granted."
What is lacking from this assessment (or the business case) is any estimate of the number of flights a day and their times, and whether there will be a change in the estimate number of ambulance journeys. Without which, you can't say how noisy it will be, what impact it will have on the city. That said, given that every Friday and Saturday night the Police helicopter is out and about, it probably won't add to the noise levels of that part of town. It would be interesting to see a noise level study of that vehicle's travels.