GPS Primary?
GPS Primary?
Join Date: Mar 1999
Location: Domaine de la Romanee-Conti
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It means that the GPS-derived aircraft position is being used as the primary source of aircraft navigational data by the FMGS, with the ADIRS position being used to monitor it.
Join Date: Apr 2007
Location: St George Island, Florida
Age: 75
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GPS Primary?
Internal functions automatically monitor individual satellite failures and the integrity of GPS signals. If a failure is detected, up to [6] minutes is allowed to re-acquire GPS signals. If the GPS cannot be recovered, GPS PRIMARY LOST is displayed and a smooth transition occurs to navigation using DME/DME or VOR/DME radio position updates - if available. If radio updates are not available (e.g., out of range) NAV ACCURACY OWNGRADE and IRS ONLY NAVIGATION messages will be displayed in the scratchpad if certain other conditions are met.
