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直升機(jī)飛行員手冊直升機(jī)操作手冊 The Helicopter Pilot’s Handbook

時間：2011-04-05 11:37來源：藍(lán)天飛行翻譯 作者：航空 點擊：次

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Lines are patrolled at whatever speed is comfortable, generally between 20 or 50 knots, a little above pole height and to one side, depending on what is being looked for. This could be just trees encroaching on the wires, but also could be lightning damage. Observers will normally be on the opposite side to you so the lines will be closest to them. They make commentaries on tape which are later transcribed into useful information.
Always try to follow the line as near into wind as possible, or, if not, in trim at least, which will help if you lose tail rotor authority. If it's around 10 knots or so, being downwind generally will only ensure the transit time along the wire is too fast, with the consequent danger of you trying to slow down and having no airspeed—if more it may be rough as well, especially in the mountains.
Monitor the instruments and be particularly aware of overtorquing or overtemping. Don't forget tail rotor and wire strikes, and other lines (especially tower lines) crossing—the observers will be too busy to assist your lookout. If a closer inspection is called for, DO NOT try to come to the hover and backtrack, but gain height and speed, positively identify the area and make a conventional circuit and approach to come to the hover alongside the line into wind.
A constant lookout must be maintained at all times, especially for fast, low flying military aircraft, so High Intensity Strobe Lights (HISLs), nav lights, landing lights and anti-collision beacons must be on at all times. HISLs should be at least 2000 candela in power (so don’t drop one or you’ll have to pick them all up). If they become unserviceable, patrol above 500 feet. Don't plan on doing more than two to three hours per day due to the high workload.
Wires
70% of wirestrikes happen with highly experienced pilots, and around 50% happen in clear sky conditions. Very often, a wire that is seen on the way into a landing spot is either missed or forgotten about on the way out – it is therefore a good practice to circle a spot on the way in, to give yourself the best chance of catching any wires that may be present.
If you cannot see wires themselves, there are often clues to their existence. When following a power line, for example, if the line changes direction by more than a few degrees, there will often be guy wires to help hold the pole erect where it changes. If there is a road in the way, the guy wire may well go across it, according to convenience. Not that you would be that close to have it affect you.
Always cross a set of lines at the pole or a tower.

Power Line Cleaning & Maintenance
Done when the Electricity people can’t get to them by road. As you can imagine, a lot of training is required for this, especially when the lines are kept live. Your hovering needs to be precise for long periods.
There is a platform on your helicopter, on which the lineman sits, who connects the machine to the line to equalise the potential. This means that the helicopter is live as well, so special maintenance is carried out beforehand to ensure the ship's normal electrics aren't fried.

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