Dual firing pin mechanisms like the T-38 unit utilize a cross bracket assembly attached to the top of the initiator. This provides the interface with the ejection seat and ensures the firing mechanisms pull equally. The cross bracket can be adjusted to take into account any difference between the mount point of the pull initiator on the rail and the attachment point on the ejection seat. Attachment to the seat occurs without preload. This ensures the safety pin can be removed and installed easily without risk to the individual performing the task.
One of the factors in designing a Mechanical Pull Initiator’s configuration is dependent upon their installation location. For initiators attached to the seat rail, the firing pin pull shafts are attached to the top of the ejection seat by means of a bracket assembly / seat attachment bolt interface. For cockpit attachments the initiator has a protruding lever that is struck by the seat. The basic function of each is the same, single or dual, seat pull or trip. As with the IAFI and EAFI, the upward movement of the seat activates a similar firing pin mechanism, compressing a spring, reaching a release point and expanding the spring to for the firing pin to strike the PP. Below are examples of seat rail and cockpit mounted installations