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  • Chapter 8: Flight Instruments › Altimeter Operation

    altimeter indicates an altitude above the actual field elevation. If the barometric pressure setting is reset to the current altimeter setting of 29.68 "Hg, then the field elevation is again indicated on the altimeter. This pressure change ... easily noticed in flight since aircraft fly at specific altitudes. The aircraft steadily decreases true altitude while the altimeter is held constant through pilot action as discussed in the previous section. Knowing the aircraft’s altitude is vitally important…

  • Chapter 11: Aircraft Performance › Takeoff and Landing Performance › Landing Performance

    could be accepted. There is a light rain and the winds are out of the east at ten knots. The pilot accepts because he or she is approaching the extended centerline of runway 27. The turn is tight ... pilot must descend (dive) to get to runway 27. After becoming aligned with the runway and at 50 feet AGL, the pilot is already 1,000 feet down the 3,500 feet runway. The airspeed is still high by about…

  • Chapter 11: Aircraft Performance › Density Altitude

    Under conditions higher or lower than standard, these levels cannot be determined directly from the altimeter. Density altitude is determined by first finding pressure altitude and then correcting this altitude for nonstandard temperature variations. Since density varies directly with pressure ... inversely with temperature, a given pressure altitude may exist for a wide range of temperature by allowing the density to vary. However, a known density occurs for any one temperature and pressure altitude. The density of the air, of course…

  • Chapter 5: Aerodynamics of Flight › Lift

    factor usually increased is the airspeed or the AOA because these are controlled directly by the pilot. Lift varies directly with the wing area, provided there is no change in the wing’s planform. If the wings have the same ... proportion and airfoil sections, a wing with a planform area of 200 square feet lifts twice as much at the same AOA as a wing with an area of 100 square feet. Two major aerodynamic factors from the pilot…

  • Chapter 8: Flight Instruments › Setting the Altimeter

    this reason, a generous margin of altitude should be allowed—not only for possible altimeter error, but also for possible downdrafts that might be associated with high winds. To illustrate the use of the altimeter setting system, follow a flight ... altimeter setting window. The altimeter indication should then be compared with the known airport elevation of 487 feet. Since most altimeters are not perfectly calibrated, an error may exist. When over Mineral Wells, assume the pilot receives a current altimeter…

  • Chapter 11: Aircraft Performance › Performance Charts › Sample Problem 3

    chart. In this case, the lift-off speed at 2,600 pounds would be 63 knots and over the 50 foot obstacle would be 68 knots. Figure 11-21. Interpolating charts. Figure 11-22. Density altitude chart. Sample Problem ... right across the table. The takeoff speed is in the second column and, in the third column under pressure altitude, find the pressure altitude of 3,000 feet. Carefully follow that line to the right until it is under…