Weather Product Age - Garmin GI 275 Pilot's Manual

WEATHER PRODUCT AGE

Unlike real-time weather information collected directly from weather sensors on-board an
aircraft, such as an airborne weather radar or a lightning detection system, datalink weather
in contrast relies on external service providers to collect, process, and transmit weather
information to the aircraft. This information can come from a variety of sources such as
government agencies.
NOTE: Due to the time it takes to collect, process, and distribute datalink weather
information, it is imperative for pilots to understand that datalink weather information
is not real-time information and may not accurately depict current conditions.
Each datalink weather product has a weather product age. This age represents the elapsed
time, in minutes, since the weather product was compiled. It does not represent the age of
the information contained within the weather product itself. SiriusXM and FIS-B weather
products are broadcast automatically on a repeating cycle without pilot intervention.
Each datalink weather product has an expiration time. The weather product age is shown in
white if it is less than half of this expiration time, otherwise it is shown in amber until reaching
its expiration time. After a weather product has expired, the system removes the expired
weather product and shows white dashes instead of the age. If the datalink receiver has not
yet received a weather product 'No Data' appears instead of the age to show the product is
currently not available for display. This may occur, for example, after powering on the system
but before the datalink receiver has received a complete weather data transmission. It could
also indicate a possible outage of a weather product.
The following table shows the expiration times for each weather product. The service
provider and its weather data suppliers define and control the data update intervals, which
are subject to change.
190-02246-01 Rev. A
Weather Product
METARs
TAFs
SIGMETs/AIRMETs
Pilot Weather Report (PIREP)
Winds Aloft
Temporary Flight Restriction (TFR)
Radar Precipitation (NEXRAD)
Lightning
*Cloud Top
Garmin GI 275 Pilot's Guide
Hazard Avoidance
Expiration Time
90 minutes
60 minutes
60 minutes
90 minutes
90 minutes
60 minutes
30 minutes
30 minutes
60 minutes
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