DME Flashcards
What system was DME originally developed from
Tatical air nav syst (TACAN)
What does DME provide the pilot, using what equipment/ systems
Slant dist between aircraft amd ground.
- airborne interrogator
- ground based beacon (transponder)
How does an interrogator initiate and exchange?
By transmitting a plus pair on an assigned ‘channel’ to transponder (ground)
What info does a DME provide
- Dist to station (NM)
- closure rate in KTs
- time to station (minutes)
Are DME channels selected by the pilot
No (unless using TACAN)
How is a DME channel selected
By selecting a paired VOR or ILS frequency on the VHF-NAV set
What is a DME arc most commonly used for
To position aircraft from initial approach fix for an instrument approach.
Such as ILS, TACAN or VOR
Will DME signal when there is an obstruction between the transmitter and reciever
No, its a LOS system
Do all radio NAVAIDS have the same coverage
No, each station has a rated coverage
What does rated coverage mean
The max distance at which indications are considered accurate enough to establish a positive radio fix
Will multiple transponders on the same frequency cause errors
Yes, interrogator range issues
What is slant range
The LOS distance along a slant direction between two points, at different altitudes
At what distance from the ground facility does the slant range error become insignificant
1NM
What does the DME or GNSS arrival procedure provide
Descent guidance along a specified track or sector
What form of radar is DME
Secondary
