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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(diǎn)擊：次

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For normal wooden poles, being one and a half rotor spans laterally and flying at about 50 kts is the ideal, although 11 Kv ring circuits in a clover leaf pattern could make this difficult. At the very least, you need a positive airspeed, that is, one showing on the ASI.
The authorities assume the flight won't take place in the avoid area, so low flying exemptions, etc. are geared towards looking after third parties on the ground not directly connected with your activities. However, the flights are still Commercial Air Transport, and entering the avoid curve is therefore prohibited. If prolonged incursions are likely, consider using a twin.
Even where a single-engined machine could be used, it's usually over areas that aren't suitable for forced landings or are unable to afford safety for the passengers (hostile environments). There should be a full restraint harness for each occupant together with a protective helmet and flameproof overalls, or clothing with sensible shoes.
No flights should be made at night, over fuel installations or congested areas of any city, town or settlement. Dispensations will be required to fly near nuclear installations and prisons, just in case they think you're part of an escape plan.
Flights should also be confined to within 300 feet of the lines concerned (but no closer than 1 . rotor diameters to the lines when level, or 1 diameter plus 30 feet when above). Flying above and to the right is most preferable. In addition, lines should be crossed vertically at least 100 feet above them (common sense dictates that you should do this over a pylon rather than the lines themselves). You will not be allowed closer than 100 feet to any people or vehicles directly concerned with line operations and 200 feet to any other structures than those to do with the lines themselves. You shouldn't, but if you have to go under a wire, get your skids on the ground as near to a pylon as possible.
As well as the proper permissions, other problems include insurance. Ensure that whatever you get also covers you for frightened animals bolting and causing havoc—this usually happens with sharply changing noise levels caused by rapid manoeuvres. If you can't help flying over animals, at least try not to chase them through the fence!

Line patrol should not normally happen if the visibility is less than about 1 mile, and 2 if raining (1 mile is approximately 6 towers or poles ahead). These limits are higher than usual because moisture will stick to the windscreen at slower speeds, and things are further complicated if you have no windscreen wipers, as precipitation won't blow away either. Under those conditions, speeding up to get rid of water is not what you want to be doing, especially when those grey towers merge into the weather! Give serious consideration to aborting if there is a lot of rain, although really heavy stuff will tend to run off better than the light variety. Also, line patrol should not normally be attempted if the wind is above 25 knots, and the cloudbase below 400 feet.

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