IFD400 Series Pilot Guide
General 6-17
One or more datalink weather products were expected but
not received within the timeout period. The Datalink Status
Page will show those that are overdue.
The tables in the “Datalink Weather Overlays And
Operations” section on page 3-16 show the products and
their associated “late” timeout periods.
Broadcast datalink receiver failure
The IFD has lost communication with the datalink receiver
or the receiver is reporting a fault. Datalink weather will be
unavailable. If the condition persists, contact a local dealer
for service.
<p> Age is greater than <x> minutes
The datalink product
<p> has been received
at least o
nce
but has not been updated for <x> minutes and is now
considered stale.
The tables in the “Datalink Weather Overlays And
Operations” section on page 3-16 show the products and
their associated “stale” timeout periods.
Position updated using dead reckoning
The system will use the last known position and
groundspeed (and heading if available) to estimate the
aircraft position following loss of GPS for up to 5 minutes.
Since Dead Reckoning assumes no directional or
groundspeed change, it will not be reliable even during
those first 5 minutes if either or both of these factors have
changed.
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