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.

3. Contents
 Inter-seat Sequencing System(ISS)

4. Inter-seat Sequencing System

5. Mode Selector Valve
SOLO
BOTH
CMD FWD
The mode selector valve
lets the aircrew select
one of three modes to fire
the ejection seats.

6. 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.

7. 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.

8. 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.

9. Summary
 Inter-seat Sequencing System(ISS)

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