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    Re: aircraft magnetic compasses
    From: Gennaro Sammarco
    Date: 2005 Feb 3, 21:47 +0100

    almost everything is correct, but they do change the runaways number when
    there is a change in magnetic variation. The rwy is designated in this way:
    if it is aligned as for 354?, it'll be rwy 35, if 356?, than it'll be rwy
    36, for example. So sometimes they have the update the procedures and rwy
    designators. The procedure is not that complicated, because the job is only
    to print new charts and change the painting on the rwys, no big changes in
    the flying routes.
    Usually you are adviced about this trough 'notams' (notice to airmen) very
    similar to the notices to mariner.
    Two month ago this has been done in Caracas and last month in airports in
    Canada and USA.
    Gennaro Sammarco
    ----- Original Message -----
    From: "Paul Hirose" 
    Sent: Thursday, February 03, 2005 8:19 AM
    Subject: Re: aircraft magnetic compasses
    > George Huxtable wrote:
    > >
    > > Isn't it true that magnetic bearings also enter into the labelling of
    > > runways?
    > Correct. For example, a runway oriented to 60 degrees magnetic would
    > normally be designated Runway 06 or Runway 24, depending on which
    > direction is in use (normally determined by the wind). With two
    > parallel runways at the airfield, they'd be called 06L and 06R, etc. I
    > think letter C can be used too if there are three parallel runways.
    > Los Angeles International has *four* parallel runways, so one pair's
    > numbers are fudged a little to eliminate conflict: the runways are
    > called 06L, 06R, 07L, and 07R (or the reciprocals). In reality, all
    > four are parallel to better than .1 degree.
    > I doubt that runway designations are changed if the magnetic variation
    > changes at the airfield. The 10 degree numbering increments so coarse,
    > the situation should rarely occur. If it does happen that a number
    > change becomes appropriate from a mathematical standpoint, I'm sure
    > the practical difficulties of repainting the runway numbers, revising
    > publications, etc. would take precedence.
    > For an instrument approach you do need accurate runway heading, but
    > that's found in the published approach procedure.
    > --
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