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and altitude) after first seat motion to allow the drogue chute to decelerate and stabilize the seat.
The main parachute is a 20 foot aeroconical canopy type, stored in a headbox container on top of the
ejection seat. The parachute is steerable and contains water deflation pockets which aid in dumping air
Figure 2-34. SJU-17 Ejection Modes
A1-F18EA-NFM-000
I-2-111 ORIGINAL
from the canopy after landing in water. The seat drogue chute is stored in a separate container on top
of the drogue deployment catapult. The seat contains controls for adjusting seat height and for locking
and unlocking the inertia reel shoulder restraint straps. A survival kit is installed in the seat pan.
2.15.3.2 SEAWARS - SEAWATER Activated Release System. SEAWARS is a seawater activated
system that automatically releases the parachute from the crew member. When the sensing-release
units are immersed in seawater, cartridges are fired which allow the crew member to separate from the
parachute.
2.15.3.3 Ejection Control Handle. The ejection control handle, located between the crewman's legs
on the front of the seat pan, is the only means by which ejection is initiated. The handle, molded in the
shape of a loop, can be grasped by one or two hands. To initiate ejection, a 25 to 40 pound pull removes
the handle from its housing, and a continued pull of 30 to 60 pounds is required to pull both sears from
the dual initiators. Either of the initiators can fire the seat. After ejection, the handle remains attached
to the seat. The ejection control handle safes the ejection seat safe/armed handle.
2.15.3.4 Ejection Seat SAFE/ARMED Handle. To prevent inadvertant seat ejection, an ejection seat
safe/armed handle is provided. The handle, forward on the right seat armrest, safeties the seat when
rotated up and forward, and arms the seat when it is rotated aft and down. The safe/armed handle is
locked when placed to either of these two positions and the handle must be unlocked by squeezing a
locking lever within the handle cutout before changing positions. When in the armed position the
visible portion of the handle (from the occupant's vantage point) is colored yellow and black with the
word ARMED showing. In the safe position, the visible portion is colored white with the word SAFE
showing. The seat is safe only when the word SAFE is entirely visible on the inboard side of the
SAFE/ARM handle and the handle is locked in the detent. Placing the handle to the SAFE position
causes a pin to be inserted into the ejection firing mechanism to prevent withdrawal of the sears from
the dual seat initiators.
2.15.3.4.1 CK SEAT Caution. The CK SEAT caution light is located on the caution light panel and
repeats the DDI CHECK SEAT caution. The caution comes on when the right throttle is at MIL or
above, weight is on wheels, and the ejection seat is not armed.
2.15.3.5 Shoulder Harness Inertia Reel. Pilot shoulder harness restraint is provided by a dual strap
shoulder harness inertia reel mounted in the seat below the parachute container. The dual inertia reel
shoulder straps connect to the parachute risers which in turn are buckled to the seat occupant's upper
harness. The inertia reel locks when the reel senses excessive strap velocity. Manual locking and
unlocking of the reel is controlled by the shoulder harness lock/unlock handle on the left side of the
seat bucket. During ejection a pyrotechnic cartridge is fired to retract the shoulder harness to position
the seat occupant for ejection.
2.15.3.6 Shoulder Harness Lock/Unlock Handle. The shoulder harness lock/unlock handle on the
left side of the seat bucket has two positions. To operate, the handle must be pulled up against spring
pressure, moved to the desired position, and released.
FORWARD
(locked)
The inertia reel prevents the reel straps from being extended and ratchets any
slack in the straps back into the reel.
A1-F18EA-NFM-000
I-2-112 ORIGINAL
AFT
(unlocked)
The reel allows the pilot to lean forward, but the inertia portion of the reel continues
to protect by locking the reel when it senses excessive strap velocity. Once
locked, the pilot can normally lean forward again after a slight release in pressure
on the reel straps.
2.15.3.7 Leg Restraint System. A leg restraint system is located on the front of the ejection seat. The
function of the system is to secure the occupant's legs to the seat during ejection. The system consists
of two adjustable leg garters, a restraint line, and a snubber box for each leg. One garter is worn on the
thigh and one on the lower leg. The restraint lines are routed through the garter rings and the snubber
box as shown in figure 2-35. One end of each restraint line is secured to the cockpit floor and the other,
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NATOPS Flight Manual 飞行手册 1(89)
