Q2. The time interval b/w the transmission of a given DME interrogation pulse and the reception of the appropriate response pulse at the a/c is 2 milli sec. the slant range is:
ans162nm
The Pulse takes 12.36 microseconds to travel 1 nautical mile to and back ,
2 millisecond [ms] = 2000 microsecond
2000/ 12.36 = 161.8 nm
Q3. The accuracy of DME at 100 nm slant range is within:
a.3nm-- ans
b.4nm
c.2nm
d.1nm
{ i think ans shud be 1 nm as accuracy of dme is 1.25% of range.
so (1.25/100)*100=1.25}
-ICAO recommends accuracy of 0.25 nm plus 1.25% of the distance measured.
which would be 0.25 + 1.25 = 1.5
OR
- DME accuracy should be within 3% or .5 nm which ever is greater
( You will find both these answers in various books , so for the indigo exam go with 3% as it fits )
@ DJ Flyboy ... just following the footsteps of all in this forum ...To share all that i can !!
