IFD500 Series Pilot Guide
Aux Subsystem 5-93
However, there may be times, or geographic locations in the
world, where it is desirable to manually de-select a satellite
vehicle or series of satellite vehicles from the GPS solution. For
example, most locations in Australia can see a US WAAS satellite
and a Japanese MSAS satellite, neither of which are used for
Australian precision approach flying. In that case, it may be
desirable to de-select those specific satellite vehicles from the
GPS position fix algorithm.
Satellite vehicles (SVs) can be manually de-selected via the
Maintenance Mode pages. The de-selected SVs persist across
power cycles.
Datalink Status Page
The “Datalink” selection will be available if the IFD has been
properly configured to integrate with a compatible on-board
datalink weather system.
The upper part of this page shows the weather products
supported by the datalink system (and subscription level, if
applicable) with their age and receipt status. For each weather
product, the status will show one of the following for “age”:
The numeric age, in minutes, of the weather product.
This is typically the elapsed time since the weather
product was last received. However, for forecast
products (e.g. winds aloft) this is the forecast time.
“---” – dashes indicate that the product is not available
with the current subscription level
“Not Xpctd” – the product is not expected to be received.
The IFD will not issue an “Overdue” alert for this product
“Not Rcvd” – the IFD is expecting the product, it has not
been received, but the time elapsed since IFD power up
has not exceeded the “late” timeout period (see page 4-
18).
“Overdue” – the IFD was expecting the product, but it
was not received within the “late” timeout period.
The lower part of the page shows a legend containing the various
symbols used in the datalink data depictions on the maps.
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