"Ron Rosenfeld" wrote in message =
...
On Sat, 18 Dec 2004 17:49:42 GMT, wrote:
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I know the aim para 5.4.7 says that aircraft approach categories are
based on 1.3 times the stall speed in the landing config at max
certificated gross landing weight (comes from far 97.3 (b).

However I know I have read somewhere, perhaps the aim or a far,
something along the lines that where the manufacturer has provided
data to allow the pilot to determined the approach speed based on
weight, that this can then be used to determine which category the
aircraft falls in.

Does anyone know of where I would have read something along these
lines?

Stan
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Perhaps:
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14 CFR 97.3
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(b) Aircraft approach category means a grouping of aircraft based on a
speed of VREF, if specified, or if VREF is not specified, 1.3 VS0 at =
the
maximum certificated landing weight. VREF, VS0, and the maximum
certificated landing weight are those values as established for the
aircraft by the certification authority of the country of registry. =
The
categories are as follows: ...
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--ron

Stan:
Continuing beyond what Ron quoted, here's more...
"If it is necessary to maneuver at speeds in excess of the upper limit
of a speed range for a category, the minimums for the next higher
category should be used."

I don't know why it says "should". I'd expect it to say "must".
Anyway, that applies to me. I like to approach with several extra =
knots,
which bumps me into category B.

I think your question was related to the calculation of Vref for the
specific landing weight and conditions, as is done when operating
heavier, usually turbine-powered, aircraft.