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Visual

ATC Responsibility

ADC controllers can conduct "pseudo-visual" separation between aircraft under the following conditions:
- ADC controllers only
- Projected flight paths do not conflict
- Within 5nm of AD
- Both aircraft below the cloud base
- Visibility >8km

This separation technique can be supplemented with Tower View linked to a flight simulator. More info on that can be found here

This technique is useful for situations such as:

  • Procedural towers processing aircraft at altitudes below usable surveillance
  • Making more efficient use of runways at major aerodromes by allowing departures to roll with aircraft on final
  • Processing VFR aircraft arriving or departing during a busy established sequence (e.g. helicopter operations at Sydney)
  • To assist the TCU controller in separating aircraft close to the airfield

    • Pilot Responsibility

    Pilots can be given responsibility to maintain own separation with other aircraft provided:
    - Both aircraft are operated at or below A100; and
    - One pilot reports the other aircraft in sight; and
    - That pilot accepts responsibility for maintaining own separation with that aircraft

    Pilots will continue to follow ATC instructions but the controller will no longer be responsible for maintaining a separation standard between the two aircraft. If the pilot loses sight of the aircraft, an alternative separation standard will need to be used.

    Where an aircraft is instructed to maintain own separation with an IFR aircraft, traffic information should be passed to the IFR aircraft, including advice of assignment of separation responsibility to the other aircraft.

    This technique is useful for situations such as:

    • VFR aircraft manoeuvring behind another aircraft on approach to land (e.g. helicopter operations at Sydney)
    • Allowing aircraft to conduct airwork in a position which would normally conflict with other aircraft
    • Providing track shortening or expedited clearances where a delay would normally occur due to other aircraft

    Example

    RSCU203 is a VFR helicopter who wishes to depart from Royal Prince Alfred Hospital, which sits directly under the YSSY RWY 16L approach path.
    SY ADC: "RSCU203, report sighting a Jetstar A320 on a 6nm final RWY 16L"
    RSCU203: "Traffic sighted, RSCU203"
    SY ADC: "RSCU203, are you able to maintain own separation with the Jetstar A320?"
    RSCU203: "Affirm, RSCU203"
    SY ADC: "RSCU203, maintain own separation with the Jetstar A320, caution wake turbulence, report airborne"
    RSCU203: "Maintain own separation with the Jetstar A320, wilco, RSCU203"
    SY ADC: "JST219, traffic is a helicopter becoming airborne from RPA, approximately 4nm final, maintaining own separation with you, runway 16L, cleared to land"