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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
Specialised Tasks 61
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.
For cleaning or deicing, a water
pressure system powered by a small
gasoline engine is used, and you get
to hover a bit further away.
Civil Aviation Notification Procedure
(CANP)
In UK, powerline survey, sporting
activities, aerial photography, crop
spraying, underslung loads and
anything else low level (i.e. below
1000 feet) that will affect military
operations should be notified on
0800 515544. The relevant (RAF and
ATC) authorities will informed by
the duty airman of the details.
Naturally, try to give them as much
notice as possible.
Pipeline Survey
This is similar to Line Patrol, so
most of what is said there will apply
here. Gas pipelines (or whatever) are
not very far below the surface of the
ground, and potential hazards
include building works, ditch
construction, drainage, flooding,
leakage and falling trees.
1/250,000 scale maps will be
provided, on which the pipeline
route should be marked, though it
will be obvious when it’s just been
laid. Observers will be using larger
scale maps supplied by their
companies. The normal patrol height
is 300 feet (in UK, anyway), with an
associated speed of 50-80 kts, taking
into account the efficiency of
inspection, terrain, wind direction
and practical helicopter operation
(avoid curves, etc.). However,
between 500-700 is recommended to
avoid low flying military aircraft.
You should not approach closer
than 300 feet to any person, vessel,
or structure, and only closer than
500 feet within a horizontal distance
of 300 feet from the pipelines.
The cloudbase must be at least 200
feet above inspection height, with a
minimum visibility of 1500 feet.
UK Police Operations
A police force will either own its
own aircraft or charter from
operators as and when required, in
which case the only things you can
get away with are low flying (closer
than 500 feet, etc) and going in bad
weather. Even then, you can’t get
closer than 50 feet, or 1.5 rotor
diameters, whichever is greater. In
fact, to take full advantage of any
restrictions, your passenger needs to
be either a police officer, an
employee of the police authority, a
medical attendant, a pilot under
training, an Inspector, a Fire Officer,
62 The Helicopter Pilot’s Handbook
a Customs Officer on a joint
operation, or any other agreed in
writing by the authorities. However,
there will always be a police
observer, and the job involves a lot
of cross-controlling when on
observation, not to mention shortnotice
tasking.
As they may need to recover their
costs from time to time, they may
also need a Police AOC and Ops
Manual (PAOM), though this
depends on the country.
Prisoners
A prisoner is a passenger and
qualifies for the normal safety
considerations, although their
movement is definitely not routine.
Handcuffing should always be done
to the front, so seat belts can be
released in emergencies.
Potentially violent prisoners should
be carried one at a time and have
enough escorts to restrain them. In
any case, at least two should be used,
ensuring that neither the pilot, the
controls or the exits can be reached.
If a prisoner does become violent,
land as soon as practicable and have
them continue the journey by
surface means.
Persons under the influence
These should be avoided, but
sometimes it can’t be helped. First of
　
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本文鏈接地址：The Helicopter Pilot’s Handbook(41)