If there is no manual backup for the critical systems, this is a HUGE danger to the crew, and an epic design screwup. Submarines, aircraft and spacecraft need both primary and secondary backups, with the secondary backup being as low-tech and manual as possible. Anything else is courting disaster.
If there is no manual backup for the critical systems, this is a HUGE danger to the crew, and an epic design screwup. Submarines, aircraft and spacecraft need both primary and secondary backups, with the secondary backup being as low-tech and manual as possible. Anything else is courting disaster.