Runway Holding Position – Designated Position Before Runway Entrance

Introduction

A Runway Holding Position is a critical safety feature at every airport, marking the exact point where aircraft or vehicles must stop before entering or crossing an active runway. These positions are established to prevent runway incursions—unauthorized presence on runways—which are among the most significant hazards in aviation.

Runway holding positions are a product of international regulation, harmonized by the International Civil Aviation Organization (ICAO) and the Federal Aviation Administration (FAA), and are found at all airports supporting fixed-wing aircraft operations.

Definition and Purpose

A Runway Holding Position is:

• A physically marked and signed area on the airport surface, usually where a taxiway meets a runway, or at points protecting sensitive areas such as Instrument Landing System (ILS) zones.
• The regulatory and operational boundary where all aircraft and vehicles must stop and hold unless explicitly cleared by Air Traffic Control (ATC).

ICAO Doc 4444 defines it as “a designated position intended to protect a runway, an obstacle limitation surface, or an ILS/MLS critical/sensitive area at which taxiing aircraft and vehicles shall stop and hold, unless otherwise authorized by the aerodrome control tower.”

The FAA Aeronautical Information Manual (AIM) echoes this, emphasizing holding before entering or crossing an active runway, with compliance enforced by markings and signage.

Key Roles:

• Prevent unauthorized access to runways.
• Safeguard aircraft during landing, takeoff, and taxi operations.
• Protect navigational aids from interference (especially ILS areas).
• Define clear communication and coordination points for pilots and ATC.

Types of Runway Holding Position Signs and Markings

Mandatory Instruction Sign (Runway Holding Position Sign)

• Appearance: Rectangular, red background with white runway numbers (e.g., “09-27”).
• Location: Adjacent to the holding position marking at each taxiway-runway intersection or runway-runway intersection.
• Requirement: Illuminated or retroreflective for visibility in all conditions.
• Function: Instructs pilots/vehicle drivers to stop and not proceed unless cleared.

Pavement Marking (Runway Holding Position Marking)

• Appearance: Four yellow lines—two solid (on the holding side) and two dashed (on the runway side)—across the taxiway or runway.
• Interpretation:
  • Solid Side: Stop and do not cross unless cleared.
  • Dashed Side: Aircraft may cross when returning from the runway side.
• Location: At all taxiway/runway and critical area intersections.

ILS Critical Area Holding Position

• Marking: “Ladder” style—double solid yellow lines, connected by pairs of solid lines.
• Sign: Red background, white “ILS”; found near the runway threshold.
• Purpose: Protects ILS signal integrity during low-visibility or instrument approaches.

Runway Approach Area Holding Position

• Sign: Red background, white “XX-APCH” or “XX-DEP”.
• Marking: Standard four-line holding marking.
• Usage: Where taxiways approach active runway approach or departure paths, preventing interference.

Runway Boundary Sign

• Appearance: Yellow background with black graphical marking.
• Location: Facing the runway at taxiway exits.
• Function: Confirms to pilots they have exited the runway and may contact ground.

Standard Locations and Siting

Runway holding positions are placed according to ICAO Annex 14 and FAA standards:

• Taxiway/Runway Intersections: To protect the runway strip and obstacle-free zone.
• Runway/Runway Intersections: For land-and-hold-short (LAHSO) and similar procedures.
• ILS Critical Areas: To prevent signal interference.
• Approach/Departure Paths: Where surface movement could pose a hazard to arriving/departing aircraft.

Summary Table:

Operational Procedures

Controlled Airports

• Never cross a runway holding position without explicit ATC clearance.
• Stop so no part of the aircraft/vehicle crosses the solid lines.
• Remain at position until cleared to enter, cross, or line up on the runway.

Non-Towered Airports

• Stop and hold at the marking until the runway is visually confirmed clear.
• Broadcast intentions on the CTAF/unicom frequency.

After Landing

• Clear of runway only once all parts of the aircraft have passed the holding position marking.

ILS Operations

• Hold at ILS critical area when instructed, especially in low visibility, to protect ILS signal reliability.

Sample ATC Instructions:

Example Scenarios

Scenario 1: Taxiway to Runway

• Taxiing to Runway 36L:
  • Visual cues: Red “36L” sign, four yellow lines.
  • Action: Stop at solid lines, await clearance.

Scenario 2: Runway Intersection

• Holding short of intersecting runway:
  • Visual cues: Red sign with intersecting runway number, standard marking.
  • Action: Stop, do not enter intersection without clearance.

Scenario 3: ILS Critical Area

• Low visibility taxi:
  • Visual cues: Red “ILS” sign, ladder-style yellow lines.
  • Action: Hold until specifically cleared.

Scenario 4: Exiting the Runway

• After landing:
  • Visual cues: Yellow boundary sign at taxiway exit.
  • Action: Do not call ground or stop checks until fully past the marking.

Regulatory References

• ICAO Doc 4444: Defines operational and regulatory standards for holding positions.
• ICAO Annex 14: Details marking, sign, and siting requirements (Sections 5.2.9, 5.4.2).
• FAA AIM 2-3-5: Covers US standards and compliance requirements.

Summary and Best Practices

Runway holding positions are pivotal for runway safety and must be respected by all pilots and ground vehicles. Their markings and signs provide a universal language for surface movement safety, preventing incursions and protecting critical flight operations.

• Always stop before the solid lines, at the sign.
• Never cross without explicit clearance.
• Be vigilant for special markings (ILS, approach areas).
• Only consider yourself clear of the runway after fully passing the holding position marking.

Runway holding positions are not just paint on the pavement—they are the frontline defense in runway safety management worldwide.

For technical diagrams, see ICAO Annex 14 Figures 5-8 and 5-9. For operational details, refer to FAA AIM and ICAO Doc 9870.