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The document describes an inter-seat sequencing system (ISS) in military aircraft that controls the ejection of seats. The ISS has a mode selector valve that can be set to SOLO, BOTH, or CMD FWD mode to determine whether the front seat, rear seat, or both eject individually or together. In SOLO mode, only the triggered seat will eject. In BOTH mode, the rear seat will eject first followed by the front seat. In CMD FWD mode, the rear seat will eject first regardless of which handle is pulled.

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I.s.s.
I.s.s.
Contents Inter-seat Sequencing System(ISS)
Inter-seat Sequencing System
Mode Selector Valve SOLO BOTH CMD FWD The mode selector valve lets the aircrew select one of three modes to fire the ejection seats.
Inter-seat Sequencing System The ISS in SOLO Mode Front seat firing handle is pulled; ONLY Front canopy jettisons 0 sec, Front seat ejects 0.40 sec. Rear seat firing handle is pulled; ONLY Rear canopy jettisons 0 sec, Rear seat ejects 0.40 sec.
Inter-seat Sequencing System The ISS in BOTH Mode Front or rear seat firing handle is pulled; Rear canopy jettisons 0 sec, Rear seat ejects 0.40 sec, Front canopy jettisons 0.85 sec, Front seat ejects 1.30 sec.
Inter-seat Sequencing System The ISS in CMD FWD Mode Rear seat firing handle is pulled; ONLY Rear canopy jettisons 0 sec, Rear seat ejects 0.40 sec. Front seat firing handle is pulled; Rear canopy jettisons 0 sec, Rear seat ejects 0.40 sec, Front canopy jettisons 0.85 sec, Front seat ejects 1.30 sec.
Summary Inter-seat Sequencing System(ISS)
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I.s.s.