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Ejection Mode Sequences
Mode 1: low speed/low altitude

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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ejection modes. The system includes a parachute container opener that is activated by gas pressure from the 7,000- or 14,000-foot aneroid initiators, or the seat and man separation initiator. The WORD rocket is also part of the system. The WORD rocket, mounted on the back of the seat, is connected to the drogue bridle assembly on one end and to the parachute WORD bridle on the other end. The WORD rocket motor is released from the seat and fired by a lanyard as it falls away from the seat during low-speed ejections or by the pull of the drogue during high-speed ejections. The ejection sequence follows one of four modes, depending on aircraft airspeed and altitude. Mode 1 includes ejections where the air- craft is operating below 7,000 feet and at a speed less than 225 knots. Mode 2 includes an altitude below 7,000 feet, but at a speed greater than 225 knots. Mode 3 occurs above 7,000 feet, but below 14,000 feet, at any airspeed. Mode 4 occurs above 14,000 feet at any airspeed. Figure 6-33 presents a comparison of the various modes. MODE I.— Mode 1 (fig. 6-34) is for a low- speed, low-altitude ejection. After the catapult outer tube assemblies have traveled upward a distance of approximately 31 inches, ballistic gases are ported through the inner trombone assemblies to actuate the 0.1- and 1.3-second time delays in the multiple delay initiator and the 3-second delay initiator. Gases from the 0.1-second delay actuate the drogue and WORD release and arm the 14,000-foot aneroid initiator. Below 14,000 feet, the initiator immediately actuates and gases pass through the right trombone to actuate the parachute container opener. Upon actuation of the WORD motor and drogue release assembly, the aerodynamic drag of the drogue parachute Figure 6-33.—SJU-8/A mode of operation. 6-49







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