From BRSI’s website (under FAQs):
WHAT CHANCE IS THERE OF ACCIDENTAL FIRING?
The rocket motor trigger is not “armed.” You arm it only when you pull the handle. It cannot go off without a deliberate pull on the handle. Firing the rocket requires a 35-40 pound tug. This can be done by just about any adult, but hardly qualifies as a “hair trigger.”
CAN IT DETONATE ON A HARD LANDING?
No. Short of pulling the handle, the rocket cannot ignite. You can’t fire it by hitting it, dropping it, heating it (within reason), or any other action. Only pulling the handle will fire it. The unit cannot “just go off.” It is dormant until the pilot exerts a deliberate two-step action.