Boarding Stairs

Height / doorsill range: The stair unit must adjust to different aircraft door sill heights (e.g., 0.9 m to ~6 m) so it can service various aircraft.

Mobility / chassis type: Towable vs self‑propelled. Self‑propelled units have their own drive system, useful for bigger airports. Towable units can be simpler.

Safety & build quality: Non‑slip steps, handrails, stabilizers, good frame construction, meets industry standards (IATA AHM, SAE ARP).

Adjustability / elevation mechanism: Telescopic stairs or hydraulic lift to match different aircraft heights.

Suitability for climate / terrain: Especially in Pakistan context—units should handle local weather, ramp conditions, maintenance options.

Supplier & service: Local availability, spare parts, maintenance support, and vendor who can ship and install in Pakistan.