PH.VI.B.K1
KnowledgeEffects of wind, weight, temperature, and density altitude.
From the FAA library
- 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 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 10: Advanced Flight Maneuvers › Maximum Performance Takeoff
maximum performance takeoff, know thoroughly the capabilities and limitations of the equipment. Also consider the wind velocity, temperature, density altitude, gross weight, center of gravity (CG) location, and other factors affecting pilot technique and the performance of the helicopter ... accomplish this type of takeoff safely, there must be enough power to hover out of ground effect (OGE) in order to prevent the helicopter from sinking back to the surface after becoming airborne. A hover power check can be used…
- 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 11: Aircraft Performance › Takeoff and Landing Performance › Landing Performance
braking at this point. The most critical conditions of landing performance are combinations of high gross weight, high density altitude, and unfavorable wind. These conditions produce the greatest required landing distances and critical levels of energy dissipation on the brakes ... minimum landing distance from the AFM/POH data, the following considerations must be given: • Pressure altitude and temperature—to define the effect of density altitude • Gross weight—which defines the CAS for landing • Wind—a large effect due to wind…
- Chapter 10: Weight and Balance › Control › Weight and Balance Restrictions
temperatures, and high humidity (high density altitudes), may require a reduction in weight before flight is attempted. Other factors to consider when computing weight and balance distribution prior to takeoff are runway length, runway surface, runway slope, surface wind ... overloaded in weight. Other aircraft can be loaded in such a manner that they will be out of CG limits even though the useful load has not been exceeded. Because of the effects of an out-of-balance or overweight…