Radio Navigationmedium#1193
DME search mode occurs when:
A
The aircraft is too far from the station
B
The aircraft is in the cone of confusion
C
The station is unserviceable
D
The equipment is first turned on and seeks to lock onto the station's reply pulses
CorrectExplanation
In search mode, the DME interrogator sends a high rate of pulse pairs (about 150 per second) while searching for replies. Once locked, it reduces to tracking rate (~25/sec).
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