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The 640 MEG Shareware Studio 2
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The 640 Meg Shareware Studio CD-ROM Volume II (Data Express)(1993).ISO
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README.2ND
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1992-09-30
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TALKDOWN
========
Copyright Adrian Marsden, Sept. 1992
This is a shareware demonstration of a Surveillance Radar Approach.
Please feel free to use it and pass it on to others. It can be used as an
instrument approach facility or as a landing training aid. This Surveillance
Radar Approach, along with the others in it's family are copyright to Adrian
Marsden, Sept 1992. If you wish to add this facility to other scenery areas
please read REGISTER.DOC.
A Surveillance Radar Approach (SRA) is where, during times of bad
weather, or simply a layer of low cloud, the radar facility of an airfield
can assist you to arrive at a point where you can decide to attempt to land
your aircraft, overshoot and try again, (hoping for a small break in the
clouds), or overshoot to your nearest diversion airfield.
This is accomplished by one of the Air Traffic Controllers being
assigned to the SRA. The Approach Controller will "feed" you into the SRA
and then pass you on to the SRA controller. You will have been placed
about six miles from touchdown and 1500 feet Above Ground Level (AGL).
The SRA Controller, (on a different frequency), will give you information
about where you are to assist you to reach your point of decision called,
believe it or not, your "Decision Height". The information given is where
you are, (compared with the extended centerline), what distance you are from
the threshold of the runway and what height you should be at for the
distance you are from the threshold. You are also given recommendations
as to actions you should carry out, for example, "Turn right 2 degrees",
or in a more urgent situation, "You are too far right of centerline...
overshoot now, overshoot, overshoot, overshoot...." (But if he does that
it's probably his fault.)
The result of this is that the SRA controller will talk you to a
point where, (with any luck), you can see the runway and make a normal
landing. This is what is known as your "Decision Height". Under normal
circumstances there is no actual decision to be made. It simply means
that if you can see a clearly recognizable set of runway lights you can
continue, if not you either "go around" or divert to a different airfield.
Under abnormal circumstances, such as a "Fuel Emergency', a pilot
may decide to "push" his decision height a little further but he must
appreciate that an SRA is an inherentlty inaccurate activity, as opposed
to a Precision Approach Radar (PAR) which uses two radars which are
calibrated regularly by a special aircraft and so can tell your position
and height to a few feet. An SRA merely uses the approach radar, which
is in no way sufficiently accurate to place you exactly on the threshold
of a runway. It's still a great concept and it works!! If you follow the
Approach Controller to the "hand-over" and the SRA Controller's
instructions you will rarely go wrong. The result, put almost any weather
you want onto your Flight Simulator and this will give you a good chance
of making a safe landing at any airfield......!!
There is a rider on this..... Your decision height and approach path
is designed for the Cessna Skylane 182. A larger aircraft requires a longer
approach path and, because of it's downward impetus, a higher decision height.
(You can't gain a rate of climb as quickly with a heavier aircraft).
I am presently working on the other approach paths and decision heights
and will have them available soon.
Good Luck and remember... There are Old pilots, Bold pilots, but there
are few Old, Bold pilots. The decision to overshoot is a serious one and will
never be frowned upon. (you can always blame the SRA controller.....)