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According to ICAO Annex 2, in the event that a controlled flight inadvertently deviates from its current flight plan, the appropriate ATS unit has to be informed?
  • A
    about any deviation in TAS.
  • B
    if the time estimate for the next reporting point is found to be in error in excess of more than one minute from the time notified to ATS.
  • C
    about any track deviation from the centre line of an established ATS route only when that deviation exceeds 2 NM for more than one minute.
  • D

    if the average true air speed varies by plus or minus 5% of the true air speed given in the flight plan.

ICAO Annex 2
3.6 Air traffic control service

3.6.2.2 Inadvertent changes. In the event that a controlled flight inadvertently deviates from its current flight plan, the following action shall be taken:

a) Deviation from track: if the aircraft is off track, action shall be taken forthwith to adjust the heading of the aircraft to regain track as soon as practicable.

b) Variation in true airspeed: if the average true airspeed at cruising level between reporting points varies or is expected to vary by plus or minus 5 percent of the true airspeed, from that given in the flight plan, the appropriate air traffic services unit shall be so informed.

c) Change in time estimate: if the time estimate for the next applicable reporting point, flight information region boundary or destination aerodrome, whichever comes first, is found to be in error in excess of 2 minutes from that notified to air traffic services, or such other period of time as is prescribed by the appropriate ATS authority or on the basis of air navigation regional agreements, a revised estimated time shall be notified as soon as possible to the appropriate air traffic services unit.

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