Holding Point – Designated Position Where Aircraft Holds

A holding point is a fundamental concept in airport surface operations, forming a critical component of runway incursion prevention strategies and ensuring safe, organized movement of aircraft and vehicles on the ground.

Definition and Regulatory Basis

A holding point is a specified, marked location on an airport’s movement area—most commonly at the intersection of taxiways and runways—where aircraft and vehicles must stop and wait for further instructions from Air Traffic Control (ATC). ICAO Annex 14 officially defines it as a “specified location, identified by visual or other means, in the movement area where aircraft and vehicles are required to stop and hold.”

Holding points are not just instructions but physical positions, demarcated for operational control and safety. They are standardized worldwide, with requirements for marking, signage, and lighting defined by ICAO, the FAA, and EASA to ensure uniformity and compliance at all certified airports.

Regulatory References

• ICAO Annex 14, Volume I: Standards for design, marking, and lighting of holding points.
• FAA AC 150/5340-1M: U.S. standards for airport marking and signage.
• EASA CS-ADR-DSN: European design and safety requirements for aerodrome infrastructure.

Purpose and Strategic Importance

Why Are Holding Points Used?

Holding points serve several vital functions in airport operations:

• Runway Incursion Prevention: Marking the limit beyond which unauthorized entry may lead to conflict with aircraft taking off or landing.
• Traffic Sequencing: Allowing ATC to sequence departures and arrivals efficiently.
• Ground Conflict Mitigation: Preventing intersecting movements between taxiways and runways, especially at complex airports.
• Support for Specialized Operations: Used during Land and Hold Short Operations (LAHSO), intersection departures, and protection of sensitive ILS areas during low visibility.

Where Are They Located?

• Runway/Taxiway Intersections: The most familiar location, stopping aircraft and vehicles before entering the active runway.
• Intermediate Taxiways: Placed to manage congestion or high-traffic intersections.
• Within Runways: For LAHSO, at specified runway points to support simultaneous operations.
• Cat II/III and ILS Critical Areas: Located to protect instrument landing system signals during poor visibility.

Markings, Signage, and Lighting

Surface Markings

The international standard for runway holding position marking is:

• Four yellow lines: Two solid (on the holding side) and two dashed (on the runway side), painted perpendicular to the taxiway centerline.
• Width: Each line is at least 15 cm wide (ICAO standard).
• Placement: Always positioned so the solid lines face the direction from which the aircraft or vehicle approaches.

Aircraft must always stop with the entire fuselage before the solid lines and may not proceed unless cleared by ATC.

Signage

• Mandatory Instruction Signs: Red background with white runway or taxiway designations, placed at the holding point, typically on the left side of the taxiway.
• Examples: “27-9” indicates holding for runways 27 and 9.

Lighting

• Stop Bar Lights: Rows of red, in-pavement lights across the taxiway at the holding point. When illuminated, these indicate all vehicles must stop, with clearance to proceed given only when lights are extinguished.
• Runway Guard Lights: Flashing yellow lights (either elevated or in-pavement) to increase visibility of the holding point.

Marking Variants for Special Operations

• ILS Critical Area Markings: To protect sensitive instrument landing signals in low visibility.
• LAHSO Markings: Special markings and signage for land-and-hold-short procedures.

Operational Procedures

Standard Operating Procedure

1. Taxi to the Holding Point: As directed by ATC, using airport diagrams for reference.
2. Stop at the Marking: Ensure all parts of the aircraft remain behind the solid lines.
3. Await Clearance: Do not cross the holding point without explicit ATC authorization.
4. Read Back Instructions: Always read back “hold short” or crossing clearances verbatim, including the runway or taxiway identifier.

Conditional and Special Clearances

• Conditional Clearances: “Hold short of runway 27 until landing aircraft vacates.”
• Intersection Departures: Hold at the designated intersection holding point.
• LAHSO: Land and stop before a specified marking, as cleared by ATC.

Phraseology Examples

• ATC: “Taxi to holding point Bravo, runway 18 via Alpha. Hold short of runway 18.”
• Pilot: “Taxi to holding point Bravo, runway 18 via Alpha, hold short of runway 18, N123AB.”

Reporting and Emergency Procedures

• Reporting: Pilots may be asked to “report established at holding point” for ATC situational awareness.
• Emergencies: If unable to comply, immediately inform ATC and await further instructions.

Non-Compliance

Failure to stop at or respect the holding point is a runway incursion—a serious violation resulting in investigation and possible sanctions.

Distinction Between Related Terms

Hold Short

• Definition: ATC instruction to stop and not cross a specified point (usually a holding point).
• Context: “Hold short” is an action, not a location.

Holding Pattern

• Definition: An in-flight racetrack circuit flown around a navigation fix to delay approach or landing.
• Not on the ground: Completely different from ground-based holding points.

LAHSO (Land and Hold Short Operations)

• Definition: Procedure requiring an aircraft to land and stop before a specified point on the runway.
• Special markings/signs: Used for simultaneous operations and increased runway efficiency.

Practical Examples and Use Cases

1. Departure Hold at Runway

• Scenario: Aircraft taxis for departure.
• ATC: “Taxi to holding point Bravo, runway 27 via Alpha. Hold short of runway 27.”
• Action: Aircraft stops at marking, waits for takeoff clearance.

2. Intersection Departure

• Scenario: Aircraft departs from intersection.
• ATC: “Taxi to holding point Charlie, runway 18 via Bravo and Charlie. Hold short of runway 18.”
• Action: Aircraft holds at intersection, waits for clearance.

3. LAHSO Clearance

• Scenario: Arriving aircraft instructed to hold short after landing.
• ATC: “Cleared to land runway 9, hold short of taxiway Bravo.”
• Action: Pilot confirms, lands, and stops before LAHSO marking.

4. Reporting at Holding Point

• Scenario: ATC requires confirmation.
• ATC: “Report established at holding point Delta, runway 22.”
• Action: Aircraft stops, pilot reports position.

5. Holding Pattern (In Flight)

• Scenario: ATC directs aircraft to hold in the air.
• ATC: “United 789, hold west of the ALPHA VOR on 270 radial, right turns, 1-minute legs.”
• Action: Pilot flies holding pattern until further clearance.

Safety, Compliance, and Best Practices

Runway Incursion Prevention

Holding points are the last physical and procedural defense against unauthorized runway entry. Strict adherence prevents collisions and ensures regulatory compliance.

Regulatory Oversight

• ICAO, FAA, EASA: Mandate holding point use, marking standards, and operational procedures.
• Runway Safety Programs: Regular audits and training ensure all personnel understand holding point requirements.

Best Practices

• Always consult current airport diagrams.
• Use proper phraseology and read backs.
• Never cross a holding point unless explicitly cleared.
• Challenge unclear instructions immediately.

Conclusion

Holding points are fundamental to safe and efficient airport surface operations. They are standardized, well-marked, and protected by international regulations, forming the backbone of runway incursion prevention and ground movement management worldwide. Proper understanding and compliance with holding point procedures protect lives and maintain the integrity of the global aviation system.