How An Ordnance Safe and Arm Device Works
The Ordnance Safe and Arm Device (OSA) or Interrupter Device is an electro-mechanical safe & arm device used to initiate an explosive train once it is in the ARM state. The interrupter device also provides intrinsic safety against inadvertent initiation of the explosive train when it is in the SAFE state. The Interrupter utilizes a booster to provide the necessary output to initiate various ordnance devices in a continuing explosive train, such as an FCDC. When the Interrupter is in the SAFE position, the booster is mechanically isolated from the explosive train outputs providing a barrier to prevent accidental explosive train initiation. When the interrupter is in the ARM position, the booster is moved in-line with the explosive train input and output ports, providing the correct state to facilitate explosive train initiation. The interrupter booster is initiated by an energetic input stimulus at the interrupter input port from FCDC, DBA, or other types of Initiator, than an electrical input. An electrical stimulus is used to place the interrupter in the ARM or SAFE position. The Interrupter contains both local visual (window) and remote electrical redundant SAFE and ARM position monitor circuits. In addition the Interrupter includes a safing mechanism for manual safing.