时间:2011-04-05 11:37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. Check the manual and electrical releases, and don’t accept the fact that the solenoid clicks as evidence of it working. If there’s no-one else around, put a rope in and pull on it when you operate the mechanism. After you operate the manual release, check that the Bowden cable between the hook and the body of the helicopter doesn’t bind and stop the hook from rearming. All witness marks should be aligned on the knurled knob or lever and the hook body, make sure the hook moves over its full range of travel and that the bungee cord keeps it tight against the bottom of the fuselage, so you don’t land on a vertically extended hook, which may get snagged. Garbage on the landing site has been known to pull the manual release enough to allow the load to work itself free. Condition of sling equipment Because of the direct connection to the aircraft and the potential for damage, it should only be used on helicopter operations, and any worn or frayed items should be discarded (you’re generally allowed up to 10 randomly distributed frayed wires on a steel sling, or 5 in one strand). Nylon deteriorates when exposed to petroleum, and wire rope rusts and doesn’t like being mistreated, so protect them from moisture and heat, and inspect them regularly. Cables without their internal grease will snap readily. The maximum length for nylon or poly rope should be 6 feet. There must be an eye in each end of a sling, preferably reinforced with steel, to protect the rope, and the shackle that goes inside the eye must be the right size for the hook, otherwise it may come out by itself, or not come out when it’s supposed to (as a guide, the shackle pin should be the same thickness as the rope – DON’T use a bolt instead; it will bend). Using a swivel will stop the load from spinning and unravelling the line. That is, you put the swivel in the hook, then attach the load to the swivel (which, by the way, has a thrust bearing in it). When using a screw-pin shackle (clevis): with a rope of whatever description, don’t have the shackle downwards (as shown above), because the rope will slide from side to side and have a tendency to open the legs (if it rolls fore and aft, it will also undo the pin). Rather, place the screw-pin in the helicopter hook, padding the empty space either side with washers or similar, and use it upside down. |