Overview
ISO 16004:2017 - Aircraft ground equipment - Passenger boarding bridge or transfer vehicle - Interface requirements with aircraft doors - defines the dimensional interface and unobstructed space requirements for the aircraft mating section of passenger boarding bridges and passenger transfer vehicles. It applies to civil transport aircraft with a door sill height greater than 2.0 m (80 in) above ground and documents how boarding equipment must avoid contact with critical aircraft items (pitots, probes, sensors, strakes, etc.). ISO 16004:2017 does not prescribe aircraft design; instead it ensures compatibility between aircraft ground equipment and existing aircraft door environs.
Key topics and technical requirements
- Reference planes
- Vertical reference plane: perpendicular to the local aircraft skin through the forward edge of the door (with a defined 0.915 m offset for inward-opening doors).
- Horizontal reference plane: the aircraft door sill plane.
- Critical areas
- Specific hatched zones around passenger doors (left/right symmetrical) that must remain clear to prevent damage to exposed devices.
- Minimum clearance and positioning
- The mating section shall guarantee absence of interference with critical areas while in contact with the aircraft skin, accounting for padding flexibility.
- Designs shall allow a reasonable longitudinal positioning accuracy (a positioning accuracy of ±100 mm / 4 in or more is suggested).
- Automatic levelling and back-up systems
- Passenger boarding bridges shall include an automatic levelling system (per IATA AHM 922) and an approved back-up method (e.g., platform cut-outs) to prevent aircraft damage if levelling fails.
- Safety and operating requirements
- Compliance with ISO 6966-1/ISO 6966-2 safety principles.
- Regular briefing of staff on critical device locations, positioning/removal procedures, and visual inspections for interference.
Applications and who uses it
ISO 16004:2017 is used by:
- GSE manufacturers designing passenger boarding bridges and transfer vehicles
- Airport operators and ground handlers managing safe positioning and operation
- Aircraft OEMs and maintainers checking compatibility with door environs
- Regulators and safety engineers responsible for ground-aircraft interface risk mitigation
Practical benefits include reduced risk of damage to flight‑critical probes and sensors, improved interoperability between boarding equipment and multiple aircraft families (Airbus, Boeing, Lockheed, McDonnell Douglas listed), and safer turnaround operations.
Related standards
- ISO 6966-1 / ISO 6966-2 (basic GSE requirements)
- ISO 7718-1 / ISO 7718-2 (aircraft door interface requirements)
- IATA AHM 922 (automatic levelling and back-up guidance)
- EN 12312-4 (passenger boarding bridge safety requirements)
Keywords: ISO 16004:2017, passenger boarding bridge, transfer vehicle, aircraft door interface, aircraft ground equipment, automatic levelling, critical areas.
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