Re: Pelicans---Was "Weird Plane Incident"
- From: "Scott" <a8daa97@xxxxxxxxxxxxxxx>
- Date: Tue, 27 Jun 2006 23:20:58 -0700
Nice try Chuck, but as usual, you're wrong. Let's have a look at some big
airports here on the coast. The three busiest international airports on
the west coast are KLAX, KSFO and CYVR and all three have significant
approaches over water.
KSFO;
Rwy 28L, 28R, 19L and 19R all approach over water (San Francisco Bay).
The threshold of any of these is approx 500ft from the waterline (and none
have displaced thresholds). On a standard 3 degree approach slope (which
of course the ILS and VASIS/PAPI approaches are), simple trig from grade 8
will tell you for every 19ft from the threshold, you're one ft in the air,
so over water, you're probably 25ft in the air when you cross onto land.
KLAX;
The airport itself is about 1/2mi at the closest (rwy 6R, and again no
displaced threshold) to water, but again you'd still just over 100ft in
the air on a 3deg approach.
CYVR;
Rwys 8L and 8R are both about 750ft from shore, so probably 40ish feet
ASL. This also doesn't mention that the approach to 26R is over a marsh
and we know who/what types of animals (can you say "Birds" - I knew that
you could) inhabit the area. As for Rwy 12/30, you're still not more than
2000ft from shore at either end, and not a displaced threshold in sight.
As a pilot, I've flown HUNDREDs of approaches over water, and at night,
it's even more common as they try and route you away from people for noise
abatement.
In summary it's pretty hard to take the word of an 'expert on water
approaches' from a man who lives in the dessert. You might want to check
your facts next time before spouting off
NOT over WATER!
As a current pilot, not even the small aircraft *I* fly do a 50'
approach over water. Not even CLOSE!
Do yourself a big favor and drive to an airport like Galveston and
WATCH an over water approach (or takeoff, for that matter). The
aircraft will be at LEAST 2500-3000' off the deck when it crosses the
shoreline, if not more.
HELL, on islands like Papaeete (FAA airport) or St Thomas, or Aruba
where the runway ends almost at the water line, commercial aircraft
are STILL at 2000'AGL when they cross the shoreline. Most are at
1500' crossing the displaced threshold.
Ever wonder what those lines painted on the ends of the runways are
for?
Geeze Tom, sometimes I wonder how you got a license to practice
medicine...... but then I remember.... that's why they call it
medical "PRACTICE".
Chuck
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