the ratchet wheel, permitting free withdrawal of the
the seat bucket and on the main beam assemblies ensure
that only the correct seat bucket is installed in forward
SHOULDER HARNESS CONTROL SYS-
and aft cockpits (fig. 2-18).
TEM.--The shoulder harness control lever (fig. 2-17),
Because of aircraft installation requirements,
on the LH side of the bucket, engages in either one of
SJU-17(V)1/A, 2/A and 9/A seat bucket assemblies are
two positions in a quadrant. The lever is connected by
one inch wider than SJU-17(V)3/A thru 6A assemblies.
Detail assemblies are essentially similar between aft
the seat bucket. A torque bar engaged within the tube
allows for vertical adjustment of the seat bucket. The
torque bar is secured to the main beam assembly,
The back of the seat bucket contains a rigid molded
together with the LH trombone tubes, by a
pad that forms the backrest. It is contoured so at
quick-release pin, its upper end engaging in a torque
ejection the seat occupant is automatically pulled back
shaft. The shaft is secured to the harness reel and has a
by the shoulder harness reel into the correct ejection
fork-end that engages the ratchet wheel.
posture. The backrest is secured by a screw through
each side of the seat bucket. A cushion attached to the
SEAT BUCKET ASSEMBLY
backrest provides additional comfort.
The seat bucket is constructed to form a square pan
Underseat Rocket Motor MK 123 MOD 0
and houses the seat operating controls. The extended
back, the bottom and front are made from sheet
An underseat rocket motor MK123 MOD 0
aluminum alloy. The sides are solid aluminum alloy
(forward seat) or MK 124 MOD 0 (aft seat) installed
plates and extend forward to provide thigh protection
under the seat bucket is secured to the side plates
and support. The bucket is secured to studs
by nuts and bolts. Differences in mounting bolt sizes
incorporated into sliding runners on the seat main
Figure 2-18.--Interference devices, seat bucket to main beams for the forward and aft seats (SJU-17(V)2/A).