| Top event | Contributing combination | Independent barrier proposal | Common-cause concern | Validation / status |
|---|---|---|---|---|
| Payload falls in flight | Primary latch not seated AND secondary retention absent/failed | Diverse captive retainers with independent seated checks | Same bracket fracture defeats both; structural proof required | Static/dynamic load and fault injection planned; no tests |
| Unexpected launch near person | False clear-zone input AND arm command accepted | Guarded exclusion zone plus hardware inhibit and supervised enable | One processor/power fault can defeat both unless separated | Independent safety-controller architecture review pending |
| Unsafe airborne release | False landed state AND release command AND no motor inhibit | Independent ground contact plus motor-state hardware interlock | Water or debris may bridge ground switch; diverse sensing needed | Mission-phase and switch-fault injection planned |
| Animal stranded or harmed | Low energy OR unsuitable destination OR release mechanism jam | Conservative reserve, permissioned destination and return/containment contingency | Network outage removes remote visibility; onboard local state essential | Combined link/weather/energy faults in HIL before any flight |
Sample — fictitious company. All numbers and people are invented scenario assumptions. This is draft concept paperwork; no physical testing, customer evidence, certification, filing or sign-off has occurred.