problems with partial inflation of time expired slides
When I was involved with sample testing of slides with a previous employer, it was always 'time expired' slides deployed as they would be going to the workshop for strip and inspection.
High speed cameras were set up to film the opening and control of the slide, all in a matter of seconds.
Rare to see a slide not full inflate once out of the box.
Failure of the cabin door to open automatically or the slide to leave the box was more likely but then the door can be assisted and the slide manually fired for a successful operation, at times, in the eyes of the CAA to monitor.
Good fun for the apprentices to jump down onto the slides....
TW