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Example:
The ATIS reports the wind as from
23
0
° at 14 knots with runway 18 in use. In the
column headed by 5
0
° (
see
Figure 20) there is
a box for 10 knots and a box for 20 knots.
Interpolating, the headwind component will be
9.5 knots and the crosswind component will be
11.5 knots. Those are “approximate” because
the wind when you touch down will rarely be
exactly what was reported.
The Wind Side of the Slide
Directions for use of the wind side are printed on the
slide (
see
Figure 21). It provides a graphic method
of solving problems in trigonometry and displaying
the answers in a very useful form.
To determine ground speed and wind correc-
tion angle you must know four things: true course,
true airspeed, true wind direction, and wind velocity.
The winds aloft forecast provides the latter two; true
course is measured directly on your sectional or
WAC chart, and TAS is either converted from indi-
cated airspeed in flight or taken from the airplane’s
performance charts during preflight planning.
Enter the wind first. Rotate the transparent disk
until the reported wind direction lines up with the
TRUE INDEX. Measure up from the grommet and
make a dot equal to the wind velocity. Each line
equals 1 knot on the E6-B, 2 knots on the paper
(E6B-P) and micro (E6B-1) models, and 1 or 10
knots on the high-speed E6-B slide accessory
(E6B-SLIDE).
Now rotate the transparent disk until the true
course lines up with the TRUE INDEX, and move
the slide up or down until the wind dot falls on the arc