时间:2011-04-05 11:32来源:蓝天飞行翻译 作者:航空 点击:次
To view this page ensure that Adobe Flash Player version 9.0.124 or greater is installed. If a decision is made to complete the approach, terminate it in a hover, so you can carefully check the landing point before lowering the helicopter to the surface. Under certain conditions, it may be desirable to continue the approach to the surface. Once the helicopter is on the ground, maintain operating r.p.m. until you have checked the stability of the helicopter to be sure it is in a secure and safe position. GROUND RECONNAISSANCE Prior to departing an unfamiliar location, make a detailed analysis of the area. There are several factors to consider during this evaluation. Besides determining the best departure path, you must select a route that will get your helicopter from its present position to the takeoff point. Some things to consider while formulating a takeoff plan are the aircraft load, height of obstacles, the shape of the area, and direction of the wind. If the helicopter is heavily loaded, you must determine if there is sufficient power to clear the obstacles. Sometimes it is better to pick a path over shorter obstacles than to take off directly into the wind. You should also evaluate the shape of the area so that you can pick a path that will give you the most room to maneuver and abort the takeoff if necessary. Wind analysis also helps determine the route of takeoff. The prevailing wind can be altered by obstructions on the departure path, and can significantly affect aircraft performance. One way to determine the wind direction is to drop some dust or grass, and observe which way it is blowing. Keep in mind that if the main rotor is turning, you will need to be a sufficient distance from the helicopter to ensure that the down-wash of the blades does not give you a false indication. If possible, you should walk the route from the helicopter to the takeoff position. Evaluate obstacles that could be hazardous and ensure that you will have adequate rotor clearance. Once at the downwind end of the available area, mark a position for takeoff so that the tail and main rotors have sufficient clearance from any obstructions behind the helicopter. Use a sturdy marker, such as a heavy stone or log, so it does not blow away. MAXIMUM PERFORMANCE TAKEOFF |