Slower cruising speeds are often used as a means to save fuel, but this will mean routinely flying closer to the minimum drag speed (Vimd); this gives less time to recognise and respond to any speed loss and eventual risk of a stalled wing condition. The wing can be stalled at any airspeed, true or indicated, and at any altitude, and aircraft attitude has no absolute relationship to the onset of an aerodynamic stall. If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user. Avoid bank angles beyond 15 degrees as the additional drag could exceed the thrust available and lead to a speed decay. I made a slight course correction to fly IFR (I Follow Roads) and wanted to stay within landing distant of I-17 ‘just in case.’ Oh, and did I mention the forested areas around the Flagstaff area? Maybe that's why "oxygen bars" are seen in high pollution metropolitan areas like Los Angeles, Mexico City, Tokyo. To fly slower than Vimd, a greater angle of attack is necessary and an increase in thrust is required to compensate for the increase in induced drag caused by the increased angle of attack. Air Safety Institute Accident Analysis. Altitude recovery is secondary and can only be achieved after successful stall recovery. Conversely, parasitic drag increases in proportion to the square of the aircraft speed. Turbine airplanes — and some piston aircraft — fly at altitudes that are incompatible with human life, and yet the pilots and passengers are healthy and happy because of pressurization and environmental systems on board. The Cessna 172R did not arrive at its destination. Since the air at higher altitude is less dense, it takes a longer takeoff roll on the runway, and the climb to altitude is slower. From textbooks and stories of — or direct experience with — sessions in FAA-approved altitude chambers, pilots also know something about the dangers of hypoxia (insufficient oxygen) at altitude. A large change in temperature will significantly alter the optimum altitude with a decrease in temperature corresponding to an increase in altitude. Lots of bad things happen when the blood's oxygen saturation drops. Obviously, level flight at speeds greater than or less than Vimd is possible. The question of stability is illustrated by the effect of any encounter with air turbulence. Less effort is required by the tailplane to counteract the nose down pitch moment of the wing and this results in less induced drag on the entire aircraft and thus maximises efficient flight. TUC is a measure of your ability to function in a meaningful way. The speed corresponding to the point of minimum total drag is known as the minimum drag speed or Vimd (sometimes Vmd) and will vary as a function of aircraft weight. The record of Accidents and Serious Incidents which have accompanied this increase in high altitude flight has suggested that pilot understanding of the aerodynamic principles which apply to safe high-altitude flight may not always have been sufficient. Lesson learned, density altitude is nothing to mess with! Embry Riddle Aeronautical University in Daytona Beach, Fla., has its own normobaric “altitude chamber” that’s open to the public.
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