Table 1-2.--Decal Color Code
compartments. The forward compartment contains an
impulse cartridge (DODIC M783) and a firing pin unit.
Secured to the lower end of the forward compartment is
an end plug that attaches to the gas-operated igniter unit
Left front (pilot)
in the igniter tube of the rocket motor. The rear
Right front (ECMO #1)
compartment of the rocket motor initiator contains a
Right rear (ECMO #2)
precoiled static line, the lower end of which is attached
Left rear (ECMO #3)
to the upper end of the drogue gun trip barrel, which is
connected to a fixed bracket on the ejection gun. The
MAIN BEAM ASSEMBLY
upper end of the cable is attached to a lever assembly by
a link to the firing pin unit sear.
The main beam assembly consists of two vertical
main beams, bridged and fixed in position by three
horizontal cross-beams, forming a strong, light-
weight structure able to withstand high-g loads. This
Each seat is provided with a different color-coded
assembly is the structural frame of the seat assembly to
time delay firing mechanism and a color-coded
which major components such as the drogue container,
murphy-proof bracket to prevent changing seats. The
drogue gun, time-release mechanism, harness retrac-
corresponding color code and crewmember position is
tion unit, and seat bucket are secured. The main beams
seen in figure 1-6.
are designed to prevent ejection seat interchange-
Pressure sensitive decals (table 1-2) are installed on
the ejection seats, which provide seat identification,
The top cross-beam positions the seat on the
warnings, and maintenance instructions.
ejection gun and receives the thrust of the ejection gun
during ejection. Passing through the left main beam and
top cross-beam is the top latch plunger, which locks the
PILOT ANF ECMO NO.1
ejection gun inner piston and ejection seat to the
SHOWN. ECMO NO. 2 AND
ECMO NO. 3 OPPOSITE.
ejection gun cylinder. Bolted to the top cross-beam is a
scissor shackle assembly, which holds the drogue
assembly to the main beam assembly before operation
of the time-release mechanism assembly.
The center cross-beam forms the upper attachment
point for the seat positioning actuator (seat bucket
height positioning actuator) and the bottom cross-beam
is the bottom support of the main beams.
Located on the inner face of each main beam are
ECMO NO. 1 - PURPLE
three slippers, positioned in the guide rails of the
ECMO NO. 2 - ORANGE
ECMO NO. 3 - WHITE
ejection gun cylinder. Two guide tracks are attached to
the outer face of each main beam, providing the
FOR PILOT AND ECMO NO. 3 SHOWN.
mounting for the seat bucket. Located at the lower outer
ECMO NO. 1 AND ECMO NO. 2 OPPOSITE.
face of the left -main beam is an inclined track, which
adjusts the angle of thrust of the rocket motor according
to the position of the seat bucket on the main beam
Figure 1-6.--Color-coded murphy-proof bracket.