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229 - ATPL - Under which of the following circumstances does a VOR/DME Area Navigation system switch to Dead Reckoning mode?

Question 229 - Radio Navigation - ATPL - Airline Transport Pilot license

VOR/DME Area Navigation computer is not receiving information from the aircraft compass system.
VOR/DME Area Navigation computer is not receiving information from the Air Data Computer.
When "DR" is selected by the pilot.
VOR/DME Area Navigation computer is receiving neither radial nor distance data information from VOR/DME stations.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license