9 / 20

Which unit other than the ATSU is allowed to impose radio silence on the current frequency?

  • A

    The SAR operation.

  • B

    The Rescue Coordination Unit.

  • C

    The aircraft in distress.

  • D

    Any aircraft in the vicinity of the distress situation.

Refer to figure.
ICAO Doc 9432
9.2.2 Imposition of silence

An aircraft in distress or a station in control of distress traffic may impose silence, either on all aircraft on the frequency or on a particular aircraft which interferes with the distress traffic. Aircraft so requested will maintain radio silence until advised that the distress traffic has ended.

ICAO Annex 10 Volume II
5.3.2.3 IMPOSITION OF SILENCE

5.3.2.3.1 The station in distress, or the station in control of distress traffic, shall be permitted to impose silence, either on all stations of the mobile service in the area or on any station which interferes with the distress traffic. It shall address these instructions “to all stations”, or to one station only, according to circumstances. In either case, it shall use:

— STOP TRANSMITTING;

— the radiotelephony distress signal MAYDAY.

5.3.2.3.2 The use of the signals specified in 5.3.2.3.1 shall be reserved for the aircraft station in distress and for the station controlling the distress traffic.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

Keyboard Shortcut Use Keyboard Shortcuts