3-7-5. PRECISION APPROACH CRITICAL AREA

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  • 3-7-5. PRECISION APPROACH CRITICAL AREA

    1. Aircraft and vehicle access to the ILS critical area must be controlled to ensure the integrity of ILS course signals whenever the official weather observation is a ceiling of less than 800 feet or visibility less than 2 miles. Unless the arriving aircraft has reported the runway in sight or is circling to land to another runway, do not authorize vehicles/aircraft to operate in or over the critical area, except as specified in subparagraph a1, whenever an arriving aircraft is inside the ILS outer marker (OM) or the fix used in lieu of the OM.
      • PHRASEOLOGY
      • HOLD SHORT OF (runway) ILS CRITICAL AREA.

      NOTE: When available weather sources such as METARs/SPECI/ PIREPs/controller observations indicate weather conditions are changing from VFR to IFR and are deteriorating, actions are expected to be taken to update the official weather observation.

      1. LOCALIZER CRITICAL AREA
        1. (a) Do not authorize vehicle or aircraft operations in or over the area when an arriving aircraft is inside the ILS OM or the fix used in lieu of the OM when the official weather observation is a ceiling of less than 800 feet or visibility less than 2 miles, except:
          1. (1) A preceding arriving aircraft on the same or another runway that passes over or through the area while landing or exiting the runway.
          2. (2) A preceding departing aircraft or missed approach on the same or another runway that passes through or over the area.
        2. (b) In addition to subparagraph a1(a), when the official weather observation indicates a ceiling of less than 200 feet or RVR 2,000 feet, do not authorize vehicles or aircraft operations in or over the area when an arriving aircraft is inside the middle marker, 1/2 final mile.
      2. GLIDESLOPE CRITICAL AREA. Do not authorize vehicles or aircraft operations in or over the area when an arriving aircraft is inside the ILS OM or the fix used in lieu of the OM unless the arriving aircraft has reported the runway in sight or is circling to land on another runway when the official weather observation indicates a ceiling of less than 800 feet or visibility less than 2 miles.
    2. Operators commonly conduct “coupled” or “autoland” approaches to satisfy maintenance, training, or reliability program requirements. Promptly issue an advisory if the critical area will not be protected when an arriving aircraft advises that a “coupled,” “CATIII,” “autoland,” or similar type approach will be conducted and the official weather observation indicates a ceiling of 800 feet or more, or the visibility is 2 miles or more.
      • PHRASEOLOGY
      • ILS CRITICAL AREA NOT PROTECTED.
    3. The Department of Defense (DOD) is authorized to define criteria for protection of precision approach critical areas at military controlled airports. This protection is provided to all aircraft operating at that military controlled airport. Waiver authority for DOD precision approach critical area criteria rests with the appropriate military authority.

    NOTE: Signs and markings are installed by the airport operator to define the ILS critical area. No point along the longitudinal axis of the aircraft is permitted past the hold line for holding purposes. The operator is responsible to properly position the aircraft, vehicle, or equipment at the appropriate hold line/sign or designated point. The requirements in Para 3-1-12, Visually Scanning Runways, remain valid as appropriate.

    • REFERENCE
    • AC150/5340-1, Standards for Airport Markings.
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