Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. architectural elements
7. circulation elements
8. [stairs and stair components]
9. stairs (series of steps)
10. [stairs by location or context]

Anotations

Scope note:

Equipment that provides a means for passengers and aircraft personnel to traverse between aircraft doors and the ground or another surface outside the vehicle. These may be towed, self-propelled, or in some cases are integral to the aircraft.