In the cabin, the flight crew will pull out their oxygen masks, which are connected to pressurized oxygen canisters. The chemical generators will last for 10-15 minutes, but apparently the flight crew's oxygen supply will last for a couple of hours.
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With loss of cabin pressurization at altitude, pressure breathing of 100% oxygen at high airway pres- sures enables the pilot's alveolar PO2 to be maintained at a safe level during emergency descent.
When you fly on an airplane, the flight attendant instructs you to “put your oxygen mask on first,” before helping others. Why is this an important rule for ensuring survival? Because if you run out of oxygen yourself, you can't help anyone else with their oxygen mask.
One important issue was how to ensure that the co-pilot didn't also accidentally fall asleep. This has been a real concern for many years in aviation, with some studies reporting that as much as 50% of pilots accidentally fall asleep during flights.
The dimming of cabin lights only happens when it is dusk, dawn or dark outside the aircraft. This is a safety measure, and is to ensure your eyes are adjusted to the gloom enough to see the floor lights leading you to safety along the aisle in the event of a crash or emergency evacuation.
The biggest reason for flying at higher altitudes lies in fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed. Less wind resistance, more power, less effort, so to speak.
Nature of flightsLong-haul flights are generally those that last beyond six hours. Indeed, pilots flying long-haul only operate one or potentially two flights each day, while those making short hops can even operate as many as four to five flights a day, and a turboprop pilot will operate even more.