It had its design weaknesses such as no toilet (astronauts used much-hated 'relief tubes' and fecal bags).
During construction, the reinforcement was not put into the proper locations, as defined in the design, exacerbating the design weakness.
The rubber space stations never flew, in part because of an obvious design weakness - they could pop if hit by meteoroids.
A failure cause is looked upon as a design weakness.
One additional design weakness of the two-fluid design was its complex plumbing.
It is commonly applied to electronic equipment and is performed to identify design weaknesses.
A major design weakness of the Electrocoagulation units is the method used in connecting the electrode to the power source.
Other than simply giving newly-built M9s, the Army is opting for a new weapon to address design weaknesses.
There may be a design weakness we can exploit, or something in the crew's routine . . ." He shook his head.
Unfortunately, several of the major components had significant design weaknesses which ultimately resulted in its failure at the Trials.