Communicationseasy#1253
The frequency 121.5 MHz must be monitored:
A
Only during oceanic flights
B
Only when in distress
C
Continuously during flight where practicable
CorrectD
Only in controlled airspace
Explanation
ICAO recommends that aircraft monitor 121.5 MHz at all times during flight when practicable, to hear distress calls from other aircraft.
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