FLIGHT PLAN PROGRAM - WINDS ALOFT ANALYSIS SCREEN    RELEASE 3.10   PAGE 1 OF 2

The purpose of this screen is to provide a detailed winds aloft analysis at a
number of altitudes for the selected individual flight leg, and to allow re-
entry of winds aloft for that leg.

To change the winds aloft, press the C (CHANGE) key.  Numbers are entered into
solid video blocks in appropriate places on the screen display.  When you type
in the first altitude, all previously entered winds for the selected leg are
erased.  You can enter winds for any altitude within the limits specified by
the program, and for any number of different altitudes.  The program will com-
pute winds for any altitudes for which they are not specified.

If you enter winds for just one altitude, the winds at sea level are assumed to
be zero and the wind gradient is computed on that basis. For this reason, it is
usually best to enter winds for two or more different altitudes, so the correct
wind gradient can be computed.  Also, the wind gradient can be sensitive to
direction, that is, the wind can be blowing from different directions at dif-
ferent altitudes; the program will take that into account. The wind gradient
is always assumed to be linear where it is not otherwise indicated.  Example:
you enter 330 degrees at 30 kts. at 3,000 feet only.  The program will compute
330 degrees at 180 kts. at 18,000 feet!

FLIGHT PLAN PROGRAM - WINDS ALOFT ANALYSIS SCREEN                   PAGE 2 OF 2

Note:  Enter TRUE wind bearings (not magnetic).  Briefers give wind directions
as true bearings anyway.

To get a printout of the winds aloft screen (without the menu), press the
letter O (not zero) key.  You will get the "Is the printer ready" prompt.  Make
sure the printer is on line first, and then respond Y.  Or, respond N or press
Esc to cancel the OUTPUT function.  You can get two screens on one print page,
or manually advance to the next page.

When you are finished with the winds aloft analysis, press F to go back to the
FLIGHT plan screen. The letter H (for HELP) key is used to invoke this explan-
ation from the winds aloft analysis screen.

Some words of advice: For best results and most correct interpolation of winds,
enter winds for actual cruising altitudes.  Usually, the briefers will do any
necessary interpolation for altitudes you request.

If interpolation results in invalid winds, the program will display asterisks
in place of values it can't compute.  A wind aloft cannot exceed 2/3 of the
true airspeed at any particular altitude.
