The SIIIS ejection seat
systems are designed to offer safe escape from an aircraft at zero airspeed
through 600 knots at all altitudes up to 50,000 feet. Fast timing of the systems
makes possible superior performance levels during adverse aircraft altitudes.
During a low-speed/low altitude ejection, the SIIIS recovery subsystem is fully
deployed 1.83 seconds after the ejection firing control is pulled. Thorough
comprehensive testing has proved these intrinsic and meaningful advantages. The
SIIS systems are designed to meet and are qualified by the extensive and
rigorous requirements of the U.S. Navy's MW-S-18471D/3, Addendum B, and includes
system testing in accordance with MIL-E-9426D.
The SIIIS escape systems
are based on a modular concept beginning with a basic seat bucket designed to
minimum size and weight requirements. A ballistic system integrated into the
seat design is composed of components that make the system totally automatic
subsequent to initiation of the ejection sequence. A stabilization subsystem,
propulsion subsystem, and recovery subsystem are essentially the same for all
SIIIS systems. These subsystems have been qualified by testing, as well as
proven in operational use. Redundant actuation methods and ballistic paths have
been designed into the system. These redundancies ensure safe ejection in the
event of a single or multiple component failure.
Whether single, or
multiple-seat configurations are required, the SIIIS modular system can easily
be adapted to most aircraft. For multiple crew stations, the additions of
trajectory divergence and inclusion of an inter-seat sequencing system permit a
planned divergent trajectory and a predetermined ejection sequence for each
seat.
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