Q For Enginners. Doorways; Are They Reinforced?
The title is vague so I'll expand on it. The fuselage area just underneath the four main door's on the 737-300 for example, I assume they are particularly robust given air bridges, stairs, catering, cleaning trucks etc regularly dock with that fuselage area.
My question is how strong is this area? How hard would an air bridge for example have to impact on that area to ground the aircraft? Could it deal with one ton of pressure for example?
Thanks.