DME Flashcards
DME uses the ____ principle based on SSR.
DME uses the transponder principle based on SSR
DME operates in the ____ frequency band
UHF
DME readouts give (ground, earth, straight, slant, triangle) range between the aircraft and ground station
What is the correct answer?
give slant range between aircraft and ground station
DME channels are normally paired with a ____ or ____
paired with a VOR or ILS
When tuning in a DME paired with a VOR you would normally tune the (VOR, DME, NDB, ADF) frequency on the NAV-COM set
What is the correct answer?
normally tune the VOR frequency on the NAV-COM set
When a DME is tuned with a paired VOR, two IDENT signals with (the same code, a different code) will be heard. The DME IDENT will be of a (higher, lower) pitch than the VOR IDENT
Which combination gives the correct answer?
When a DME is tuned with a paired VOR, two IDENT signals with the same code will be heard. The DME IDENT will be of a higher pitch than the VOR IDENT
If a DME signal is lost, this will be indicated on the display by…
the DME scrolling rapidly from 0nm to 200nm and at the same time the OFF flag or bar/line across the read out will appear
The ground DME transponder can typically provide responses to a max of ____ aircraft at the same time
100 aircraft
Describe DME saturation
When the ground DME transponder is trying to provide responses to more than 100 aircraft at the same time it will become saturated and only the strongest signals will be replied to, weaker signals will be ‘unlocked’
If TACAN is paired with a VOR it is called _____
VORTAC
Civilian aircraft can obtain (distance and bearing, distance only, no information) from TACAN
What is the correct answer?
Civilian aircraft can obtain distance only from TACAN
DME is designed to have a max range of ____nm at 30,000ft and is line of sight.
200nm
How many seconds can DME be identified?
every 30 seconds
Altitude Requiered for DME?
FL240
How accourate the ground Speed on DME?
If it is to or from the station
What information DME shows?
Ground Speed, Time to distance, Distance in NM
Slant Range occurs when the plane is passing over the station. What does DME displays?
Plane’s altitude in NM miles instead of distance
When is the slant range error is considered negligible?
if the aircraft is 1 mile or more from the ground facility for each 1,000’ of altitude above the elevation of the facility.
How should a pilot determine when the DME is inoperative?
The airborne DME may appear normal, but there will be no code tone.
how many degrees of relative bearing change should be used for each one-half mile deviation from the desired arc?
10° to 20°.
