Instrument Rating Checkride Practice Test

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How many signals can a single DME facility manage simultaneously?

  1. 50

  2. 75

  3. 100

  4. 150

The correct answer is: 100

A Distance Measuring Equipment (DME) facility can manage up to 100 signals simultaneously. This capability is essential for ensuring that the DME can offer accurate distance information to multiple aircraft in the airspace around it. Given that a DME provides range information based on the time it takes for a signal to travel from the aircraft to the ground station and back, managing 100 signals is feasible with the technology used in these facilities. Each aircraft's distance can be processed concurrently, allowing efficient navigation and separation between aircraft in a busy environment. While there are other limits related to operational efficiency and frequency allocation, the technical design of DME systems permits management of a significant number of signals, which is why 100 is the correct answer in this context.

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