block diagram of the electronic circuitry is givenprovide the optimum seat performance under allin fig. 5-29.ejection conditions, both in terms of maximizingthe survivable escape envelope and minimizing theModes of Operation.— The operationalrisk of occupant injury. Figure 5-30 shows the fiveenvelope of the NACES is divided into five zones,zones on the speed versus altitude chart, andeach of which is associated with a particulartable 5-1 gives the corresponding squib-firetiming sequence, known as modes. These timingstimings.Figure 5-29.-NACES functional block diagram.Figure 5-30.-Ejection modes.5-28
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