WEATHER DISPLAY INTERFACE
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SANDEL SN3500 EHSI PILOT’S GUIDE
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7-9
Figure 7-10 Precipitation example
Figure 7-10 depicts current aircraft position co-located with
precipitation that a pilot would normally associate with visible
moisture. However, since the FIS-B information is not referenced to
altitude, the actual observed flight conditions may vary. Figure 7-11
illustrates the flight conditions a pilot may reasonably expect to
observe while in the area displayed in figure 7-10.
.
Figure 7-11 Visible moisture observed
WEATHER DISPLAY INTERFACE
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SANDEL SN3500 EHSI PILOT’S GUIDE
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7-10
Figures 7-12 and 7-13 illustrate two other situations where observed
flight conditions will not correlate to the display in figure 7-10.
Figure 7-12 No visible moisture observed
Most likely, a flight crew will recognize the cloud deck below and
consider that the conditions represented on the SN3500 in figure 7-
10 are well below the aircraft. However, it may not be so apparent
when flying between cloud layers at figure 7-13 illustrates. When
flying between layers the flight crew may consider the FIS-B system
has mal-functioned while as the figure shows the serious weather is
below the aircraft further illustrating the lack of vertical information
provided with the FIS-B weather system.
