Garmin G1000 NXi Pilot's Manual

Also see for G1000 NXi: Cockpit reference guide Supplemental Maintenance Manual Cockpit reference guide Reference guide Pilot's guide

Contents

Garmin G1000 NXi Pilot’s Guide for the Cessna Nav III 190-02177-00 Rev. ASYSTEMOVERVIEWFLIGHTINSTRUMENTSEISAUDIO PANEL& CNSFLIGHTMANAGEMENTHAZARDAVOIDANCEAFCSADDITIONALFEATURESAPPENDICESINDEX242HAZARD AVOIDANCEWEATHER PRODUCT AGEUnlike real-time weather information collected directly from weather sensors on-board an aircraft, such as anairborne weather radar or a lightning detection system, data link weather by contrast relies on service providersto collect, process, and transmit weather information to the aircraft. This information can come from a varietyof sources such as government agencies. Due to the time it takes to collect, process, and distribute data linkweather information, it is imperative for pilots to understand that data link weather information is not real-timeinformation and may not accurately depict the current conditions.For each data link weather product which can be displayed as a map overlay, such METARs, the system canalso show a weather product age. This age represents the elapsed time, in minutes, since the weather serviceprovider compiled the weather product and the current time. It does not represent the age of the informationcontained within the weather product itself. For example, a single mosaic of radar precipitation is compriseddata from multiple radar sites providing data at differing scan rates or intervals. The weather service providerperiodically compiles this data to create a single composite image, and assigns one time to this image whichbecomes the basis of the product age. The service provider then makes this weather product available for datalink transmission at the next scheduled update time. The actual age of the weather data contained within themosaic is therefore older than its weather product age and should never be considered current.SiriusXM and FIS-B weather products are broadcast automatically on a repeating cycle without pilotintervention.Each data link weather product age has an expiration time. The weather product age is shown in white if itis less than half of this expiration time, otherwise it is shown in amber until reaching its expiration time. Aftera weather product has expired, the system removes the expired weather product from the displays, and showswhite dashes instead of the age. If the data link receiver has not yet received a weather product ‘N/A’ appearsinstead of the age to show the product is currently not available for display. This may occur, for example, afterpowering on the system but before the data link receiver has received a complete weather data transmission. Itcould also indicate a possible outage of a weather product.The weather product age is shown automatically for weather products displayed on MFD maps. For PFDmaps, the pilot can manually enable/disable the age information.Enabling/disabling the weather product age for PFD Maps:1) Press the Map/HSI Softkey.2) Press the Layout Softkey.3) Press the WX LGND to show/remove the weather product age information for PFD maps.4) Press the Back Softkey twice to return to the top-level softkeys.Tables 6-1 and 6-2 show the weather product symbols, the expiration times and the broadcast rates forSiriusXM Weather and FIS-B Weather, respectively. The broadcast rate represents the interval at which theSiriusXM Weather service transmits new signals that may or may not contain updated weather productinformation. It does not represent the rate at which the weather information is updated or when the Data LinkReceiver receives new data. The service provider and its weather data suppliers define and control the dataupdate intervals, which are subject to change.