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fly, then don't you bother either.
The least taxing are straight engine
runs. When a sliver of metal is
detected in oil, there can follow an
engine run for anything up to two
hours or so (I have known one for
five) to see if it happens again. Then
there are compass swings where you
place the aircraft on a series of
headings on an isolated spot well
away from large hangars and other
machines, while someone with a
landing compass stands outside in
the cold and rain taking readings.
Comparison of your readings with
his, adjusted with certain formulae,
give the corrections (fixed Wing
ATPL holders in UK can do
compass swings).
The shorter air tests tend to concern
themselves with the proper rigging
of flying controls. The longer ones
creep into the full-blown C of A air
tests which are Extremely Official
and done under strict procedures.
For these, you must be on the
Maintenance Contractor's approved
list of test pilots , which means
having some experience on type and
flying accurately.
The basic idea is to perform a series
of prescribed manoeuvres (timed
climbs, for instance) while an
engineer takes notes of temperatures
and pressures, etc. The results are
plotted on performance graphs (by
you) so they can be compared
against the standard figures in the
Flight Manual, which is where you
see how accurate your flying really is,
when the plotted points end up all
over the place instead of being in a
straight line. Before you start,
though, be sure that the rotors are as
clean as you can get them, because
their state will make a surprising
difference on the climb figures.
Seismic Support
An oil or seismic company operating
out in the field needs a helicopter for
Special Use Of Aircraft 241
various reasons. First of all, there are
not likely to be any roads, or, at least,
no more than forest access roads to
the staging area, and people (such as
slasher teams and drillers) will need
to be moved, as well as their supplies
which will be anything from fuel for
the drills to explosives. This will
mean a lot of slinging into tiny areas
at the end of a very long line – in the
latter stages, you might have a
carousel at the end holding six bags
which you must drop carefully in
precise locations, as they hold about
$6000 worth of equipment each. The
expected rate for “production
longlining”, as it’s called, is between
35-45 bags per hour. Sometimes, you
will have a Dynanav or Kodiak
machine to help, which produces a
series of squares on a screen, and
when they all line up, you will be on
target (there is a danger here of not
looking where you’re going when
concentrating on the machine). With
this taking the strain, the slashers
only have to clear a couple of trees
here and there.
In the early stages of the operation,
the slashers (big guys with
chainsaws) will create the helipads so
you can position them in every
morning for the rest of the week
while they cut lines a metre wide for
the surveyors to mark out for
drillers, who make holes for
explosive charges (when the whole
lot is blown up, the vibrations are
recorded and analysed in the hope of
finding oil or gas – alternatives are
electric vibrators or falling weights).
You will need to know how to work
a GPS, as there is some precision
involved, although, outside of
winter, decent map reading skills are
good enough once you know where
the pads are. However, when flying
the lines so the surveyors can check
on how the slashers are doing, you
want one that can pictorially show
you the lines to be flown.
There will be a truck acting as a
flight watch station and you will be
expected to report in every time you
land and take off at any helipad.
Here is a typical one:
The person in the truck (usually the
medic) will be keeping a log of all
movements and radio calls and will
therefore have the most information
to hand if an incident occurs. Expect
also to be given an Emergency
Response Plan, which is a bit of
paper telling you what action to take
in emergencies, together with the
following information:
·  Your location (Lat/Long)
·  Who's in charge
·  Any Radio frequencies
·  Police, Fire, Ambulance,
Hospital
·  Other helicopter companies
·  Medic
　
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