FAR Part 97: Aircraft Approach Categories - IAS vs Ground Speed

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And, your reference that the speeds on NACO charts are ground speeds?


This is getting absurd even for you. The tables provide times between fixed
points at various speeds. They can't be anything other than ground speed,
ground speed is defined as the speed of an aircraft relative to the surface
of the earth.

Let's look at an example, the LOC-B at Eagle County Regional Airport.

http://map.aeroplanner.com/plates/Fa...fs/06403LB.PDF

The distance from the FAF to the MDA is 9.5 miles. The table shows a time
of 3:10 for a speed of 180 knots. A vehicle traveling at a steady speed of
180 knots will cover a straight line distance of 9.5 nautical miles in 3:10,
so this speed certainly appears to be ground speed. But let's try another
one to be sure. The table shows a time of 9:30 for a speed of 60 knots. A
vehicle traveling at a steady speed of 60 knots will cover a straight line
distance of 9.5 nautical miles in 9:30. Again, this speed has the
properties of ground speed.

But you say they're IAS, so let's examine that. The MDA is 10,160 MSL, in a
standard atmosphere an aircraft at 180 KIAS will have a TAS of 209 knots and
will take 2:44 to travel 9.5 miles. Only with a pretty stiff headwind
component would it take 3:10 if the speeds are IAS as you insist. Are the
chart makers factoring in that wind?

Let's look at a speed of 60 KIAS. At that speed the TAS will be 70 knots,
at that speed the airplane will travel the distance in 8:57. Only with a 10
knot headwind will it require 9:30 to travel 9.5 miles. Are the chart
makers factoring in different winds for different indicated airspeeds?

I say the speeds on these charts are ground speeds simply because they can't
be anything else, I don't need a reference for that. Where's your reference
that the speeds on NACO charts are IAS?