This Is Your Captain Speaking

Photo: Brian Losito

Q: Why are airplane tires filled with nitrogen instead of air like car tires?  

Air contains moisture and freezes at high altitudes, where average temperatures hover at -57°C. Nitrogen freezes well below this and contains little to no moisture. As well, tires can warm up quickly upon landing. Nitrogen handles the heat much better than air and also prolongs tire life by preventing oxidation and rust from forming inside the wheel.  
 

Q: How do you know how much an aircraft weighs?  

Each aircraft is weighed every five to seven years or after major modifications, such as new seating configurations. The cleaned aircraft is rolled onto sensitive scales – think large bathroom scales. Engine oil and trapped fuel weights are all factored in, as well as the hangar’s latitude and altitude. Finally, for each flight, potable water, food, fuel, crew, passenger and cargo weights are accounted for to determine an accurate takeoff weight.

Crew Tip

Dress as comfortably as you can for your flight. Comfy footwear and loose-fitting clothing are recommended, and since the cabin temperature in an aircraft can change frequently, dressing in layers will allow you to adjust to the conditions on board. Packing a light sweater or a wrap in your carry-on baggage is a good idea as well.