Wondering why Porter supporters are now stating that the proposed CS100 jet is quieter than Porter’s existing turboprop Q400?
We were too.
Particularly since noise data for the CS100 is not yet available.
Here’s what happened:
The City’s consultant tried to assess the noise impact of the CS100, as compared to the Q400. Since all they had to go on was the tripartite agreement limits, they chose to assume that the CS 100 would comply with all three measures.
Porter supporters are talking about an imaginary plane.
See this, from page 41 of the Golder Health Impact Assessment:
The existing operation was based on the operation of the Bombardier Dash8-Q400 (Q400) turboprop aircraft only with a maximum annual passenger capacity of 3.8 million, which corresponds with 202 commercial movements per day.
The proposed future scenario assumed the use of commercial jets operating at BBTCA such as the Bombardier CS100(CS100).
However, as the noise emissions data associated with the Bombardier CS100 have not yet been formally established, the use of the Boeing 737-700 has been considered in the analysis as a surrogate to the CS100.
To account for some of the potential uncertainty with the noise emissions data, the Boeing 737-700 noise data was modified to the maximum levels allowable by the Tripartite Agreement, since it is understood the CS100 will be required to meet these levels if the Proposal is approved.
The result, of course was that the imaginary plane is quieter than the Q400, since the Q400 is not compliant with those noise limits, as confirmed by the Toronto Port Authority’s own consultants in 2009.