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Concerns about Safety
I have heard concerns mentioned about the safety of the new airplanes at the airport, particularly about landing field length. Specifically, the maximum required landing field length of the Bombardier Q400 is 4200 feet, while the Island airport runway is only 4000 feet long.
The Actual Landing Distance of the Bombardier Q400 is about 2000 feet. What happens with the ratings is that various factors are built in to determine the Factored Landing Distance. Influencing factors include number of passengers, weight of plane, amount of extra fuel, distance flown, sea level altitude of airport, air temperature, and visibility. Also, landing techniques influence the distance, such as whether the wing flaps are at full or partial extension. As each one changes, the projected landing length changes.
In addition, the final answer is increased by 60% (multiply by 1.6) to build in extra safety conditions. The field length of 4200 is calculated using maximum everything, which would never really occur. For example, that calculation includes a sea-level altitude of 2500 feet (thin air) while the Island Airport is at 200 feet above sea level (higher air pressure equals shorter landing). The Air Canada pilot who spoke to me has landed similar planes at the Island Airport, and indicated that there were no safety concerns with landing field length. Bombardier told me the same thing. The bottom line is that flight regulations are very strict, and extreme safety factors are built in.
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