linkage, and two ejection initiators. Actuation
of the ejection control handle, located on the front
panel of the seat bucket, mechanically pulls the
firing cable, rotating the initiation subsystem
rotors, which, in turn, extract a firing pin from
each of the two M99 ejection initiators. The out-
put gas pressure from either or both of the
initiators is transmitted to two igniters, one on
each side of the catapult cartridge, the inertia reel
gas-generating initiator, the multiple time-delay
initiator, and the thruster. The two catapult
cartridge igniters provide catapult ignition
redundancy.
Catapult Subsystem
The catapult subsystem (fig. 6-40) provides
seat propulsion throughout the catapult stroke
and applies pressure to the drogue pistons that
project the drogue parachute and its container up-
ward into the airstream. It also provides ballistic
gas to initiate seat-back rocket ignition and post-
election sequencing operations. This subsystem
may be divided into five major parts. These parts
are described in the following paragraphs.
CATAPULT CARTRIDGE.— The catapult
cartridge provides ballistic gas pressure to boost
Figure 6-40.—Catapult system.
6-56
