Technology dramatically changes in 20 years. Would you be happy to drive around in a 20 year old car design? I for sure would feel a little uneasy about the rather basic airbags, and the lack of proper FEA modelling of the crumple zone.
Same applies for planes.
Now remember these planes will probably be produced for 30 years, and then maybe in service for a further 20 years. Will you be happy to know that safety critical design decisions were made to standards of 90 years ago?
Same applies for planes.
Now remember these planes will probably be produced for 30 years, and then maybe in service for a further 20 years. Will you be happy to know that safety critical design decisions were made to standards of 90 years ago?