IFR Nav: DME

How many aircraft can a DME respond to simultaneously

• 75

• 100

• 150

• unlimited

What does DME measure

• Distance to medical examiner

• Distance to airport

• Distance to threshold

• Slant Range

How does DME operate?

• The ground stations sends omni-directional signal which bounces off aircraft and the phase difference is measured.

• A signal sent from the aircraft's transceiver to the ground station's transceiver.

• Bouncing radio waves off a mountain or large feature and timing the return.

When identifying a VOR/DME after how many VOR sweeps will you hear the DME?

• 2-3 VOR sweeps

• 3-5 VOR sweeps

• 5 VOR sweeps

• 1 VOR sweep

DME works on the principle of:

• Echo Principle, like PSR

• Interrogation, like SSR

• Interrogation, like PSR

• Echo Principle, like SSR

DME is

• Is a precision approach aid

• Distance Metering Equipment

• Distance Measuring Equipment

• Highly inaccurate due to low frequency

How do you tune a DME if it is co located with a VOR?

• Tune up the VOR and put the DME CDU into Remote mode.

• Tune up the DME and put the VOR into remote mode.

• Just tune up the VOR.

• Just tune up the DME.

The maximum range of the DME is?

• 256nm @ 30,000ft

• 80nm @ 30,000ft

• 200nm @ 30,000ft

• Line of sight

What happens if the DME loses its lock on?

• Equipment will search for a new signal and scroll from 0 to 100nm. A Nav flag will appear.

• Equipment will search for a new signal and freeze on last known DME distance. An OFF flag will appear.

• Equipment will search for a new signal and scroll from 0 to 100nm. An OFF flag will appear.

• Equipment will search for a new signal and scroll from 0 to 200nm. An OFF flag will appear.

Which statement is most correct?

• The aircraft interrogates the ground station which replies on a frequency 63Mhz higher or lower than the interrogating frequency.

• The ground station interrogates the aircraft which replies on a frequency 50Mhz higher or lower than the interrogating frequency.

• The ground station interrogates the aircraft which replies on a frequency 63Mhz higher or lower than the interrogating frequency.

• The aircraft interrogates the ground station which replies on a frequency 50Mhz higher or lower than the interrogating frequency.