FH.XI.B.K2
KnowledgeEffects of wind, weight, temperature, and density altitude.
From the FAA library
- Chapter 11: Aircraft Performance › Takeoff and Landing Performance › Takeoff Performance
approximated by assuming a direct variation with density. Actually, this assumed variation would closely approximate the effect on aircraft with high thrust-to-weight ratios. Proper accounting of pressure altitude and temperature is mandatory for accurate prediction of takeoff roll ... distance. The most critical conditions of takeoff performance are the result of some combination of high gross weight, altitude, temperature, and unfavorable wind. In all cases, the pilot must make an accurate prediction of takeoff distance from the performance data…
- Chapter 7: Helicopter Performance › Performance Charts › Sample Hover Problem 2
effect hovering ceiling versus gross weight chart. These two sample problems emphasize the importance of determining the gross weight and hover ceiling throughout the entire flight operation. Being able to hover at the takeoff location with a specific gross weight ... higher density altitude because of higher elevation, temperature, and/or relative humidity, more power is required to hover there. You should be able to predict whether hovering power will be available at the destination by knowing the temperature and wind conditions…
- Chapter 7: Helicopter Performance › Factors Affecting Performance › Moisture (Humidity)
altitude, weight, and wind. The Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25 (as revised), discusses these factors in great detail. Moisture (Humidity) Humidity alone is usually not considered an important factor in calculating density altitude and helicopter ... effects of humidity on density altitude, but some manufacturers include charts with 80 percent relative humidity columns as additional information. There appears to be an approximately 3–4 percent reduction in performance compared to dry air at the same altitude…
- Chapter 11: Aircraft Performance › Takeoff and Landing Performance › Landing Performance
wind on deceleration during the landing is identical to the effect on acceleration during the takeoff. The effect of pressure altitude and ambient temperature is to define density altitude and its effect on landing performance. An increase in density altitude ... force. Thus, the aircraft at altitude lands at the same IAS as at sea level but, because of the reduced density, the TAS is greater. Since the aircraft lands at altitude with the same weight and dynamic pressure, the drag…